- Co-based heterogeneous catalysts from well-defined Α-diimine complexes: Discussing the role of nitrogen
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Ar-BIANs and related α-diimine Co complexes were wet impregnated onto Vulcan XC 72 R carbon black powder and used as precursors for the synthesis of heterogeneous supported nanoscale catalysts by pyrolysis under argon at 800?°C. The catalytic materials feature a core-shell structure composed of metallic Co and Co oxides decorated with nitrogen-doped graphitic layers (NGr). These catalysts display high activity in the liquid phase hydrogenation of aromatic nitro compounds (110?°C, 50 bar H2) to give chemoselectively substituted aryl amines. The catalytic activity is closely related to the amount and type of nitrogen atoms in the final catalytic material, which suggests a heterolytic activation of dihydrogen.
- Formenti, Dario,Ferretti, Francesco,Topf, Christoph,Surkus, Annette-Enrica,Pohl, Marga-Martina,Radnik, J?rg,Schneider, Matthias,Junge, Kathrin,Beller, Matthias,Ragaini, Fabio
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Read Online
- Phosphinic Acid as a Bifunctional Reagent in the Catalytic Bamberger Rearrangement of Nitrobenzene to para-Aminophenol
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Phosphinic acid is proposed as a simultaneous hydrogen donor and proton source in the Pd/C catalysed transformation of nitrobenzene to para-aminophenol.
- Zoran, Ami,Khodzhaev, Oleg,Sasson, Yoel
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Read Online
- Cocatalyst-Free Reduction of 4,4′-Dinitrodiphenyl Ether to 4,4′-Diaminodiphenyl Ether Over Twin-Crystal ZnxCd1?xS under Visible Light
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Semiconductor-based photocatalytic conversion of solar energy is a promising method for the synthesis of high value-added chemicals. In this paper, a cocatalyst-free nano-twin crystal ZnxCd1?xS (T?ZnxCd1?xS) semiconductor was employed to achieve almost complete conversion of DNDPE and the yield of ODA product achieves >99 % in 40 min reaction time without additional hydrogen source. As far as we know, this is the first time to apply the photocatalytic technology for reducing DNDPE to ODA, and the photocatalytic efficiency has greatly exceeded the result of traditional catalytic method. Theoretical calculation and isotope labeling in situ HPLC-MS analysis demonstrates that the reduction mechanism of DNDPE is two nitro groups of DNDPE are separately instead of simultaneously reduced, following the process of DNDPE→NO2?C6H4?O?C6H4?NO→NO2?C6H4?O?C6H4?NHOH→NO2?C6H4?O?C6H4?NH2→NO?C6H4?O?C6H4?NH2→NH2?C6H4?O?C6H4?NHOH→ODA. Hydrogen protons of water, instead of ethanol, provide the hydrogen source for the photocatalytic reduction of DNDPE to ODA.
- Hu, Yujia,Yu, Guiyang,Xing, Chuanwang,Liu, Shanshan,Wei, Chuangyu,Liu, Heyuan,Jiang, Jianzhuang,Li, Xiyou
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Read Online
- Biomass-Derived Catalysts for Selective Hydrogenation of Nitroarenes
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Development of catalytically active materials from biowaste represents an important aspect of sustainable chemical research. Three heterogeneous materials were synthesized from inexpensive biomass-based chitosan and abundant Co(OAc)2 using complexation followed by pyrolysis at various temperatures. These materials were applied in the catalytic hydrogenation of nitroarenes using molecular hydrogen. A variety of diversely functionalized nitroarenes including some pharmaceutically active compounds were converted into aromatic amines in high yields, with high selectivity, and with excellent functional group tolerance. This green protocol has also been implemented for the synthesis of a biologically important TRPC3 inhibitor.
- Sahoo, Basudev,Formenti, Dario,Topf, Christoph,Bachmann, Stephan,Scalone, Michelangelo,Junge, Kathrin,Beller, Matthias
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Read Online
- Synthesis method of 4, 4-amino diphenyl ether
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The invention discloses a synthesis method for synthesizing 4, 4-amino diphenyl ether in a water phase, and belongs to the field of organic synthesis. The method comprises the following steps: adding4-nitrochlorobenzene into water, adding potassium hydroxide and tetrabutylammonium bromide, and heating to react to obtain the 4, 4-nitrodiphenyl ether; and adding 4, 4-nitro diphenyl ether into water, adding hydrochloric acid and palladium on carbon, introducing hydrogen, and heating to react to obtain 4, 4-amino diphenyl ether. The method is easy and convenient to operate, no organic solvent isintroduced in the production process, the method is environmentally friendly, the yield of the obtained product is high, and the method is more suitable for large-scale production.
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Paragraph 0005; 0009; 0034-0045
(2020/12/30)
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- Mass production method of 4,4'-oxydianiline from 1,4-diiodobenzene
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The present invention relates to a method for producing 4,4andprime;-oxydianiline using 1,4-diiodobenzene. After 4,4andprime;-oxybis (iodobenzene) is produced by using a Cu catalyst and 1,4-diiodobenzene in a polar solvent mixed with water, 4,4andprime;-oxydianiline can be produced through amination with ammonia introduced without a separate purification process. Therefore, compared to the conventional invention, there is an advantage in that 4,4andprime;-oxydianiline can be directly produced through amination without an intermediate purification process. In addition, expensive iodine used in the reaction is recovered as ammonium iodide and can be used again to produce 1,4-diiodobenzene, so the process efficiency is high.COPYRIGHT KIPO 2020
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Paragraph 0024; 0026-0037
(2020/07/02)
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- Synthetic method of 4, 4'-diaminodiphenyl ether
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The invention discloses a synthetic method of 4, 4'-diaminodiphenyl ether. The synthetic method comprises the following steps: S1, nitrosation reaction: adding sodium nitrite and diphenyl ether into awater phase, slowly dropwise adding hydrochloric acid in a range of 0-5 DEG C till the reaction is finished, separating out crystals, filtering the crystals, and drying the crystals in vacuum to obtain 4, 4'-diaminodiphenyl ether, wherein the reaction process is as follows; and S2, reductive reaction: adding the obtained solid into a high pressure kettle, adding a catalyst by taking alcohol as asolvent, pressurizing hydrogen to 0.5-4 MPa, heating and stirring the mixture to 70-120 DEG C, and keeping the temperature for 2-6 hours to obtain 4, 4'-diaminodiphenyl ether. The synthetic method disclosed by the invention can reduce the production cost, reduce the environmental pollution, improve the safety coefficient and reduce the emission of three wastes.
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Paragraph 0013; 0034-0040
(2019/01/21)
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- Preparation method of 4, 4'-diaminodiphenyl ether
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The invention relates to a preparation method of 4, 4'-diaminodiphenyl ether. The preparation method comprises following steps: direct hydrogenation reduction of 4, 4'-dinitrodiphenyl ether with hydrogen is carried out at 135 to 145 DEG C in the presence of a palladium/carbon catalyst containing 5wt% of palladium is carried out, wherein the using amount of the palladium/carbon catalyst is controlled to be 0.6% of the amount of 4, 4'-dinitrodiphenyl ether, hydrogenation pressure is maintained to be 0.2 to 1.0MPa, and hydrogenation is carried out for 4 to 5h until the content of 4, 4'-diaminodiphenyl ether is 99.9wt% or higher, and then hydrogenation reaction is stopped; when the temperature is reduced to 70 DEG C, an obtained reaction liquid is pumped into a crystallization kettle with nitrogen, xylene and water are added, stirring is carried out for 5 to 8h at 30 to 50rpm, recrystallization is carried out, an obtained recrystallization product is subjected to centrifugation, is washedwith methanol, and is dried so as to obtain 4, 4'-diaminodiphenyl ether. The melting point ranges from 186 to 187 DEG C, the yield is 99% or higher, the preparation method is simple, the catalyst active service life is long, product purity is high, and the obtained 4, 4'-diaminodiphenyl ether can be directly adopted in synthesis of polyimides.
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Paragraph 0012-0017
(2018/07/30)
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- Metal- and Phenol-Free Synthesis of Biaryl Ethers: Access to Dibenzobistriazolo-1,4,7-oxadiazonines and Vancomycin-Like Glyco-Macrocycles as Antibacterial Agents
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An efficient synthesis of biaryl ethers, from electron-deficient aryl halides using NaH/DMSO under metal- and phenol-free conditions, has been achieved to access dibenzo-bistriazolo-1,4,7-oxadiazonines and vancomycin-like glyco-macrocycles. A 44-membered glyco-macrocycle showed promising activity against vancomycin-resistant Staphylococcus aureus (VRSA).
- Singh, Kartikey,Sharma, Gaurav,Shukla, Manjulika,Kant, Ruchir,Chopra, Sidharth,Shukla, Sanjeev K.,Tripathi, Rama P.
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p. 14882 - 14893
(2018/12/14)
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- Technology for preparing diamido diphenyl ether through hydrogen injection reduction in closed oxygen-free environment
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The invention discloses technology for preparing diamido diphenyl ether through hydrogen injection reduction in a closed oxygen-free environment. According to the technology, a dissolution vessel, a reduction reaction vessel, a filtering tank, a distillation still A, a distillation still B, a crystallizer, a solvent tank and a vacuum pump are included. The technology is characterized by pumping out air and water vapor in a complete-flow closed condition, injecting nitrogen for substitution, injecting hydrogen in a negative-pressure nitrogen environment, and carrying out catalytic reduction with precious metals to reduce 4,4'-dinitrodiphenyl ether to be 4,4'-diamido diphenyl ether. The obtained 4,4'-diamido diphenyl ether is subjected to settlement filtration and two times of distillation and enters a crystallizer, and a solvent is separated to obtain a diamido diphenyl ether crude product. Compared with the prior art, the technology is simple and is less in control links, less in process continuous time consumption, complete in hydrogen injection reduction reaction, and superior in catalytic effect of precious metals. The product is less in residual impurities and doesn't need to be washed, so that the technology is high in popularization application value.
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Paragraph 0021-0023
(2017/10/07)
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- Fe-Catalyzed Amination of (Hetero)Arenes with a Redox-Active Aminating Reagent under Mild Conditions
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A novel and efficient Fe-catalyzed direct C?H amination (NH2) of arenes is reported using a new redox-active aminating reagent. The reaction is simple, and can be performed under air, mild, and redox-neutral conditions. This protocol has a broad substrate scope and could be used in the late-stage modification of bioactive compounds. Mechanistic studies demonstrate that a radical pathway could be involved in this transformation.
- Liu, Jianzhong,Wu, Kai,Shen, Tao,Liang, Yujie,Zou, Miancheng,Zhu, Yuchao,Li, Xinwei,Li, Xinyao,Jiao, Ning
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supporting information
p. 563 - 567
(2017/01/18)
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- Method for the preparation of diphenyl ether compounds
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The invention relates to a method for preparing a diphenyl ether compound. The method is characterized by comprising the following technical steps of: (1) adding a halogenated benzene derivative and a bis(pinacolato)diboron into a reaction vessel, adding copper chloride or aluminum chloride and 1,2-bi(diphenylphosphine) ethane as a catalyst, then adding alkaline and an organic solvent, and reacting at 25-160 DEG C for 6-24 hours; and (2) after extracting a reaction solution obtained from the step (1) by using ethyl acetate, purifying by a 200-300 meshes silica gel column, pre-eluting the silica gel column by using 20-50 mL of normal hexane, eluting by adopting an eluent at a flow speed of 1-2 mL/min for 3-6 hours, and removing the solvent to obtain the diphenyl ether compound. The method for preparing the diphenyl ether compound, disclosed by the invention, no only overcomes the disadvantage of the use of phenolic substances in a reaction process, but also has the advantages of mild reaction condition and high yield.
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Paragraph 0029-0031
(2016/12/01)
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- Synthesis and characterization of novel bio-based benzoxazines from eugenol
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Polybenzoxazines are phenolic-like materials that possess dimensional and thermal stability, and they release no by-products during their polymerization. In this study, a new class of benzoxazine-containing monomers has been prepared from renewable resource (eugenol, a natural phenol obtained from clove oil), paraformaldehyde and various aromatic diamines. The structures of the monomers were supported by Fourier Transform Infrared (FT-IR), 1H-NMR and 13C-NMR spectral analysis, proving the existence of the benzoxazine ring containing eugenol moiety in its molecular structure. The monomers were polymerized/cured via ring-opening polymerization by heating as indicated by FT-IR and Differential Scanning Calorimetry (DSC). This is confirmed by the disappearance of the peaks due to oxazine ring (942 cm-1). The exothermic peak associated with curing was observed from 170°C to 250°C. The thermal and mechanical properties of the polybenzoxazines were investigated through thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The temperatures corresponding to 5% and 10% weight loss is from 240 to 295°C and from 290 to 340°C, respectively. The completely cured materials could achieve char yields up to 36.5% at 800°C in nitrogen atmosphere. DMA revealed that the glass transition temperatures of PBz-SUL and PBz-PHE were higher than that of PBz-DDS and PBz-OXY.
- Thirukumaran,Shakila,Muthusamy, Sarojadevi
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p. 7959 - 7966
(2014/02/14)
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- Synthesis, DNA binding and antileishmanial activity of low molecular weight bis-arylimidamides
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The effects of reducing the molecular weight of the antileishmanial compound DB766 on DNA binding affinity, antileishmanial activity and cytotoxicity are reported. The bis-arylimidamides were prepared by the coupling of aryl S-(2-naphthylmethyl)thioimidates with the corresponding amines. Specifically, we have prepared new series of bis-arylimidamides which include 3a, 3b, 6, 9a, 9b, 9c, 13, and 18. Three compounds 9a, 9c, and 18 bind to DNA with similar or moderately lower affinity to that of DB766, the rest of these compounds either show quite weak binding or no binding at all to DNA. Compounds 9a, 9c, and 13 were the most active against Leishmania amazonensis showing IC50 values of less than 1 μM, so they were screened against intracellular Leishmania donovani, showing outstanding activity with IC 50 values of 25-79 nM. Despite exhibiting little in vitro cytotoxicity these three compounds were quite toxic to mice.
- Banerjee, Moloy,Farahat, Abdelbasset A.,Kumar, Arvind,Wenzler, Tanja,Brun, Reto,Munde, Manoj M.,Wilson, W. David,Zhu, Xiaohua,Werbovetz, Karl A.,Boykin, David W.
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p. 449 - 454
(2012/11/07)
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- Efficient and highly selective iron-catalyzed reduction of nitroarenes
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Pyrolysis of iron-phenanthroline complexes supported on carbon leads to highly selective catalysts for the reduction of structurally diverse nitroarenes to anilines in 90-99% yields. Excellent chemoselectivity for the nitro group reduction is demonstrated.
- Jagadeesh, Rajenahally V.,Wienhoefer, Gerrit,Westerhaus, Felix A.,Surkus, Annette-Enrica,Pohl, Marga-Martina,Junge, Henrik,Junge, Kathrin,Beller, Matthias
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supporting information; experimental part
p. 10972 - 10974
(2011/10/31)
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- Selective one-pot access to symmetrical or unsymmetrical diaryl ethers by copper-catalyzed double arylation of a simple oxygen source
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Great CO-mbination: A novel method is reported for the controlled one-pot synthesis of various symmetrical or unsymmetrical diaryl ethers by double arylation of a simple inorganic oxygen source (see scheme). This versatile and highly selective process is based on the use of a cheap and low toxicity copper catalytic system.
- Tlili, Anis,Monnier, Florian,Taillefer, Marc
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supporting information; experimental part
p. 12299 - 12302
(2011/02/16)
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- Functionalized Photoreactive Compounds
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The present invention concerns functionalized photoreactive compounds of formula (I), that are particularly useful in materials for the alignment of liquid crystals. Due to the adjunction of an electron withdrawing group to specific molecular systems bearing an unsaturation directly attached to two unsaturated ring systems, exceptionally high photosensitivities, excellent alignment properties as well as good mechanical robustness could be achieved in materials comprising said functionalized photoreactive compounds of the invention.
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- Synthesis and structure of Di[methoxy(ethoxy)carbonylamino-1H-benzimidazol- 5-yl] ethers
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A procedure was developed for preparing di[methoxy(ethoxy)carbonylamino-1H- benzimidazol-5-yl] ethers by the reaction of methyl or ethyl chloroformate with sodium cyanamide, followed by the reaction of the resulting methyl or ethyl cyanocarbamate with 4-(3,4-diaminophenoxy)-1,2-phenylenediamine in acidic solution. 2005 Pleiades Publishing, Inc.
- Pilyugin,Sapozhnikov,Kiseleva,Sapozhnikova,Vorob'eva,Klimakova
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p. 1509 - 1513
(2007/10/03)
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- Episulfide compound, method for producing the same and optical product comprising the same
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The invention relates to a novel episulfide compound useful as a starting material for optical materials that have a high refractive index and a high Abbe's number and to provide a method for efficiently producing the same and an optical product comprising the same. The episulfide compound represented by the general formula (1) : wherein EP represents and n is an integer of from 0 to 2, and the method for producing the episulfide compound represented by the general formula (1) comprises reacting a mercapto group-having episulfide compound with 2,4,6-trimethylene-1,3,5-trithiane.
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- Thermoplastic resin composition and a method of molding the same
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This invention provides a thermoplastic resin composition comprising a thermoplastic resin and 0.1 to 100 parts by weight, per 100 parts by weight of the thermoplastic resin, of an imide compound prepared, e.g., by dehydration condensation of 1,2,3,4-butanetetracarboxylic acid or a monoanhydride or a dianhydride thereof with a primary amine, and a method of molding the resin composition.
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- Synthesis of phthalonitrile resins containing ether and imide linkages
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Imide-containing phthalonitrile monomers are prepared from a phthalonitrile and an aromatic dianhydride. The monomer and a method for preparing the monomer is disclosed. These monomers are synthesized into heat resistant polymers and copolymers with aromatic ring structure incorporating imide and ether linkages. The synthesis of the high temperature thermosetting polymers and copolymers is also disclosed.
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- Polymers prepared from 4,4'-bis-[2-(3,4-(dicarboxyphenyl) hexafluoroisopropyl] diphenyl ether dianhydride
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The application relates to fluorine-containing polyimides, polyamide-acids/esters, polyamides, addition polyimides and imide oligomers which exhibit low melting points, better solubilities, low dielectric constants, superior thermal and thermal oxidative stability, and improved processing characteristics. The products of this application are characterized by the fact that they are derived from 4,4'-bis[2-(3,4-(dicarboxyphenyl)-hexafluoroisopropyl]diphenyl ether dianhydride.
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- Triazinyl reactive dyestuffs in which triazinyl group is further substituted with a beta-chloroethylsulfonyl- or vinylsulfonylbutyrylamino moiety
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Reactive dyes of the formula STR1 in which D is the radical of an organic dye of the monoazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthrone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide series, R is hydrogen or substituted or unsubstituted C1-4 -alkyl, X is a substituent which is detachable as an anion, B is a radical of the formula STR2 R1 and R2, independently of each other, are hydrogen or substituted or unsubstituted C1-4 -alkyl or phenyl, A is a substituted or unsubstituted aliphatic or aromatic bridge member, Y is a --CO--Z or --SO2 --Z radical, Z is an aliphatic, aromatic or heterocyclic reactive radical, and n is 1 or 2, are suitable for dyeing or printing cellulose-containing and nitrogen-containing materials and in high dyeing yield produce dyeings and prints having good fastness properties.
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- REDUCTION WITH METAL BOROHYDRIDE-TRANSITION METAL SALT SYSTEM. I. REDUCTION OF AROMATIC NITRO COMPOUNDS WITH POTASSIUM BOROHYDRIDE-COPPER(I) CHLORIDE
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Upon treatment with potassium borohydride-copper(I) chloride, aromatic nitro compounds afforded cleanly primary amines in high yields.Similarly, nitroso-, azoxy-, and azobenzene were reduced by the same reagent system to give aniline.
- He, Yun,Zhao, He,Pan, Xinfu,Wang, Shaofei
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p. 3047 - 3050
(2007/10/02)
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- Bis-(maleamic acid) derivatives of triamines
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The compositions described herein comprise polyimides having bis-maleimide terminal groups and having the formula: STR1 wherein Q is a trivalent aromatic radical, Ar is a divalent aromatic radical, Ar" is a tetravalent aromatic radical and n has a value of 0-20. Derivatives may be made of these compounds by homopolymerization, copolymerization with other copolymerizable materials and by reaction with Diels-Alder reactable materials.
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- Synthesis and Anthelmintic Activity of 2-Substituted 5(6)-(5-Benzimidazolyloxy)- and 5(6)-Aryloxybenzimidazoles
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A number of diaryl oxides (12-17 and 22-35) and 2,2'-disubstituted-5,5'-dibenzimidazolyl oxides (18-21) have been synthesized starting from 4-nitrophenol and 4-acetaminophenol respectively.All the compounds have been evaluated for their anthelmintic activity against Ancylostoma ceylanicum in hamsters, Nippostrongylus brasiliensis and Hymenolepsis nana in rats and Syphacia obvelata in mice.The results show that compounds 18, 19 and 33 remove 100percent of A. ceylanicum and H. nana at a single oral dose of 12.5-250 mg/kg.Compound 18 is also effective against N. brasiliensis in rats and S. obvelata in mice.
- Abuzar, Syed,Sharma, Satyavan,Gupta, Suman,Misra, Anuradha,Katiyar, J. C.
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p. 1274 - 1278
(2007/10/02)
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- Process for the purification of p-aminophenol
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An improved process for the recovery and extractive purification of p-aminophenol is disclosed. The process involves contacting an aqueous feed solution prepared by catalytic reduction of nitrobenzene in acid medium and containing 4,4-diaminodiphenyl ether, aniline and other minor amine by-products with a base to adjust the pH of the solution to 4.0-5.0, and then extracting the resulting aqueous feed solution with a mixture of aniline and toluene to selectively dissolve 4,4'-diaminodiphenyl ether in the aniline-toluene mixture and to produce an aqueous phase containing principally p-aminophenol and an organic aniline-toluene phase cotaining p-aminophenol, 4,4'-diaminodiphenyl ether and other amine by-products. The ratio of aniline to toluene is within the range between approximately 4 parts by volume aniline to 1 part by volume toluene and approximately 1 part by volume aniline to 4 parts by volume toluene, preferably a ratio of 1:1. After separation of the aqueous phase from the organic phase, the p-aminophenol of improved purity is recovered from the aqueous phase. Further efficiency in the overall yield of p-aminophenol is achieved by back-extracting the organic phase with a basic solution of potassium or sodium hydroxide to produce an aqueous layer containing the basic solution and substantially all of the p-aminophenol formerly contained in the organic phase and then recycling the aqueous layer for use as a portion of the base used to adjust the pH of the original aqueous feed solution to the range of 4.0 to 5.0. Another feature disclosed is the fractional countercurrent extraction of the original aqueous feed solution having a pH of 4.0 to 5.0 with an aniline-toluene mixture and an ammonium sulfate solution, aniline sulfate or sulfuric acid to selectively dissolve 4,4'-di-aminodiphenyl ether in the aniline-toluene mixture and to produce an aqueous phase from which a greater yield of p-aminophenol of improved purity may be obtained.
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- Polyimide derivatives having terminal unsaturated amides
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Novel compositions comprising unsaturated polyimide-polyamides and processes for their preparation are disclosed herein. These new compositions are primarily derivatives of anhydride-terminated aromatic polyimides from which they are prepared by amidation to provide unsaturated amide groups having terminal --CH=CH2 groups. These new compositions are more tractable than the original anhydride-terminated polyimides and can be converted at appropriate lower temperatures to crosslinked, insoluble, infusible polymers without by-product formation thereby extending greatly the applications for which the aromatic polyimides can be employed. Also included are monomeric compounds containing unsaturated amide groups derived from monomeric tetracarboxylic dianhydrides. These are particularly useful as crosslinking agents.
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- Polyimide derivatives having unsaturated terminal amic acid groups
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Novel compositions comprising unsaturated polyhemi-amic acid compositions and processes for their preparation are disclosed herein. These new compositions are primarily derivatives of anhydride-terminated aromatic polyimides from which they are prepared by amidation to provide unsaturated amide groups having terminal --CH=CH2 groups as hemi-amic acid groups or their derivatives. These new compositions are more tractable than the original anhydride-terminated polyimides and can be converted at appropriate lower temperatures to crosslinked, insoluble, infusible polymers without by-product formation thereby extending greatly the applications for which the aromatic polyimides can be employed. Also included are monomeric compounds containing unsaturated amide groups derived from monomeric tetracarboxylic dianhydrides. These are particularly useful as crosslinking agents.
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- Polyimide derivatives having acetylenic amic acid groups
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Novel compositions comprising acetylenic polyhemi-amic acid compositions and processes for their preparation are disclosed herein. These new compositions are primarily derivatives of anhydride-terminated aromatic polyimides from which they are prepared by amidation to provide acetylenic amide groups having terminal =C CH groups as hemi-amic acid groups of their derivatives. These new compositions are more tractable than the original anhydride-terminated polyimides and can be converted at appropriate lower temperatures to crosslinked, insoluble, infusible polymers without by-product formation thereby extending greatly the applications for which the aromatic polyimides can be employed. Also included are monomeric compounds containing acetylenic amide groups derived from monomeric tetracarboxylic dianhydrides. These are particularly useful as crosslinking agents.
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- Polyimide derivatives having terminal acetylenic groups
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Novel compositions comprising acetylenic polyimide-polyamides and processes for their preparation are disclosed herein. These new compositions are primarily derivatives of anhydride-terminated aromatic polyimides from which they are prepared by amidation to provide acetylenic amide groups having terminal --C=CH groups. These new compositions are more tractable than the original anhydride-terminated polyimides and can be converted at appropriate lower temperatures to crosslinked, insoluble, infusible polymers without by-product formation thereby extending greatly the applications for which the aromatic polyimides can be employed. Also included are monomeric compounds containing acetylenic amide groups derived from monomeric tetracarboxylic dianhydrides. These are particularly useful as crosslinking agents.
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- Silicone containing bis-thioether aromatic amines
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A silicone containing bis-thioether aromatic amine has a chemical structure wherein an aromatic nucleus at each end of the chemical radical is chemically bonded to the remainder of the chemical radical by either sulfur, sulfoxide or sulfone.
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- Ethylenic silicon compounds and thermoplastic elastomers obtained therefrom
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The invention provides organosilicon compounds of the formula: STR1 in which: N IS 1, 2 OR 3; Each R, which may be identical or different, is a monovalent organic group which contains a carbon-carbon double bond and from 2 to 10 carbon atoms; Each R1, which may be identical or different, is a straight or branched alkyl radical optionally substituted by one or more halogen atoms or cyano groups; an aryl radical or an alkylaryl radical optionally substituted by one or more halogen atoms; R2 is a straight or branched divalent alkylene or alkylidene radical possessing up to 4 carbon atoms; X is a divalent radical consisting of, or containing, at least one hetero-atom selected from oxygen, sulphur and nitrogen atoms, the radical being attached to the radical R2 via a said hetero-atom; G is an organic radical of valency (m+ l) possess from 1 to 30 carbon atoms; m is 1, 2 or 3; And each Y, which may be identical or different, is a functional group selected from: --NO2, STR2 --COOM (where M represents a sodium, potassium or lithium atom); --COOR4 ; STR3 --COCl; --OH; --OR4 ; STR4 --SH; --SR4 ; STR5 --CONH2 ; --CSNH2 ; --CN; --CH2 --NH2 ; --CHO; STR6 --NCO; STR7 wherein R3 represents a hydrogen atom or a straight or branched alkyl radical possessing up to 6 carbon atoms and R4 represents an alkyl radical possessing up to 4 carbon atoms, with the proviso that two Y groups can together constitute an imide group STR8 wherein R5 represents a hydrogen atom or a straight or branched alkyl radical possessing up to 4 carbon atoms. These are useful intermediates in the preparation of disilanes and silicon polymers, in particular of polyethylenic silicon compounds which can be polymerized with an α, ω-dihydrogenopolysiloxane to give thermoplastic elastomers.
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