- Synthesis, spectral analysis, and thermodynamic parameters of gold(III) complex in the presence of 4-bromo-2,6-bis(hydroxymethyl)phenol and m-nitroaniline
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Abstract: In the present study, we synthesized 4-bromo-2,6-bis(hydroxymethyl)phenol (BBHMP), and a gold(III) complex was synthesized in the presence of BBHMP and m-nitroaniline (m-NA). The synthesized complex was characterized using spectral (mass, UV–Vis
- Altun, ?zlen,Yoru?, Zeliha
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Read Online
- Bimetallic Bis-anion Cascade Complexes of Magnesium in Nonaqueous Solution
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Bimetallic magnesium(II) complexes are gaining significant interest in catalysis, yet their fundamental formation and behavior in organic media remain surprisingly unexplored relative to other divalent cations. To understand key principles of their formation, we investigate symmetric ditopic ligands bearing a phenolic backbone and characterize their ability to form dinuclear magnesium(II) cascade complexes with two bridging anions. High-fidelity production of bimetallic magnesium complexes relative to the monometallic complexes is indicative of positive cooperativity. Binding and recognition of analytes or substrates is a key characteristic of metal cascade complexes and relies on anion exchange, but this is also rarely studied with bimetallic magnesium complexes. Investigations with acetate, phosphate, and pyrophosphate reveal exchange of bridging nitrates using the bis-dipicolylamine complex. Rare seven-coordinate magnesium centers are found for the ester complex. The findings in this study provide formative steps to establish design principles for future generations of bimetallic magnesium(II) complexes.
- Carta, Veronica,Flood, Amar H.,Flynn, Ian G.,Van Craen, David
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- Synthesis of Monofunctionalized Calix[5]arenes
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Seven OH-free and O -permethylated monofunctionalized calix[5]arenes carrying either additional methyl or tert -butyl groups are prepared following fragment condensation protocols. This strategy proves to be superior to previous approaches. Calix[5]arenes with free OH groups all adopt a cone conformation stabilized by a seam of hydrogen bonds at the lower rim. Post-condensation modifications, i.e., methylation of phenolic OH groups or functional group interconversions can also be achieved. Bulky tert -butyl groups are also found to stabilize the cone conformations of O -methylated compounds. These compounds offer versatile functional groups that make these concave molecules interesting building blocks for the synthesis of more sophisticated molecular architectures.
- Ingenfeld, Bj?rn,Straub, Steffen,Fr?mbgen, Christopher,Lützen, Arne
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p. 676 - 684
(2017/11/16)
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- Self-assembly of supramolecular fractals from generation 1 to 5
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In the seeking of molecular expression of fractal geometry, chemists have endeavored in the construction of molecules and supramolecules during the past few years, while only a few examples were reported, especially for the discrete architectures. We herein designed and constructed five generations of supramolecular fractals (G1-G5) based on the coordination-driven self-assembly of terpyridine ligands. All the ligands were synthesized from triphenylamine motif, which played a central role in geometry control. Different approaches based on direct Sonogashira coupling and/or (tpy-Ru(II)- tpy) connectivity were employed to prepare complex Ru(II)-organic building blocks. Fractals G1-G5 were obtained in high yields by precise coordination of organic or Ru(II)-organic building blocks with Zn(II) ions. Characterization of those architectures were accomplished by 1D and 2D NMR spectroscopy, electrospray ionization mass spectrometry (ESI-MS), traveling-wave ion mobility mass spectrometry (TWIM-MS), and transmission electron microscopy (TEM). Furthermore, the two largest fractals also hierarchically self-assemble into ordered supramolecular nanostructures either at solid/liquid interface or in solution on the basis of their well-defined scaffolds.
- Wang, Lei,Liu, Ran,Gu, Jiali,Song, Bo,Wang, Heng,Jiang, Xin,Zhang, Keren,Han, Xin,Hao, Xin-Qi,Bai, Shi,Wang, Ming,Li, Xiaohong,Xu, Bingqian,Li, Xiaopeng
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supporting information
p. 14087 - 14096
(2018/10/20)
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- Synthesis and oxygen permeation of novel polymers of phenylacetylenes having two hydroxyl groups via different lengths of spacers
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Three novel phenylacetylenes having two hydroxyl groups via different kinds of spacers between the two hydroxyl groups and benzyl group were synthesized and polymerized. Two of the resulting polymers having oxyalkylene spacers between the hydroxyl group a
- Zang, Yu,Aoki, Toshiki,Teraguchi, Masahiro,Kaneko, Takashi,Ma, Liqun,Jia, Hongge
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p. 199 - 206
(2015/03/03)
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- Coordination cluster analogues of the high-Spin [Mn19] system with functionalized 2,6-Bis(hydroxymethyl)phenol ligands
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A series of 2,6-bis(hydroxymethyl)-4-R-phenol ligands (H3LR; R = H, F, Cl, Br, I, Ph, NH2, NO2, SMe) have either been newly synthesized or the existing syntheses have been significantly improved to investigate ligand-functionalized analogues of the previously published coordination cluster [MnIII12MnII7(μ4-O)8(μ3-N3)8(HLMe)12(MeCN)6]Cl2·10MeOH·MeCN (1) with S = 83/2. The crystal structures and magnetic properties of three such Mn19 clusters, namely, [MnIII12MnII7(μ4-O)8(HLH)12(μ3-Cl)7(μ3-OMe)(MeOH)6]Cl2·16H2O·10MeOH·MeCN (3), [MnIII12MnII7(μ4-O)8(HLI)12(μ3-N3)8(MeOH)6](O2CH)2·16MeOH·10MeCN (4) and [MnIII12MnII7(μ4-O)8(μ3-Cl)7.7(μ3-OMe)0.3(HLSMe)12(MeOH)6]Cl2·27MeOH (5) are reported and compared to those of the parent cluster. When these ligands are functionalized with substituents of moderate electronegativity, it is possible to synthesize Mn19 analogues; however, when such ligands bear highly electron-donating (amino) or -withdrawing (nitro) substituents, the Mn19 analogues are no longer accessible. The Mn19 cluster framework is both magnetically and structurally robust with respect to the electron-donor/acceptor characteristics of the ligand substituent; therefore, the Mn19 system is an excellent platform for peripheral chemical engineering. The robustness of the inorganic {MnIII12MnII7(μ4-O)8} core of Mn19 systems with variously functionalized encapsulating ligands is demonstrated by the invariance of the record S = 83/2 spin state. Chemical modification aimed towards attaching the molecule to various substrates does not interfere with the electronic structure.
- Mameri, Samir,Ako, Ayuk M.,Yesil, Fatma,Hibert, Marcel,Lan, Yanhua,Anson, Christopher E.,Powell, Annie K.
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p. 4326 - 4334
(2015/03/30)
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- BILATERALLY-SUBSTITUTED TRICYCLIC COMPOUNDS FOR THE TREATMENT OF HUMAN IMMUNODEFICIENCY VIRUS TYPE-1 (HIV-1) INFECTION AND OTHER DISEASES
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The invention relates to bilaterally-substituted tricyclic compounds and pharmaceutical compositions containing them, for use as medicaments. Due to their ability to interact with an internal RNA loop and to mimic a protein a-helix these compounds are effective in the treatment and/or prevention of HIV-1 (Human Immunodeficiency Virus-1) infection and other diseases such as those caused by other RNA viruses and by gram-positive and gram-negative bacteria, or infectious or chronic diseases responsive to inhibition of DNA transcription, or infectious or chronic diseases where these compounds can be used to modulate the function of RNA internal loops, or infectious or chronic diseases where these compounds can be used as agonists or inhibitors of a-helical proteins in interaction with other biomolecules.
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Page/Page column 45-46
(2014/09/03)
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- VISIBLE LIGHT ABSORBERS FOR OPHTHALMIC LENS MATERIALS
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Azo compounds that block visible light are disclosed. These light absorbers are particularly suitable for use in intraocular lens materials.
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Paragraph 0035
(2013/09/12)
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- Facile synthesis of an amphiphilic 1,3,5-trisubstituted benzene as a novel surface modifier by selective photocyclic aromatization and efficient improvement of oxygen permselectivity by the addition of the surface modifier
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An amphiphilic 1,3,5-trisubstituted benzene as a new 2D surface modifier (T-EO) which has six hydroxy groups and three oligoethylene groups was successfully and easily synthesized by selective photocyclic aromatization in high conversion and selectivity f
- Wang, Jianjun,Aoki, Toshiki,Liu, Lijia,Namikoshi, Takeshi,Teraguchi, Masahiro,Kaneko, Takashi
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supporting information
p. 1090 - 1092
(2013/09/24)
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- Structure-based design of an RNA-binding p-terphenylene scaffold that inhibits HIV-1 rev protein function
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Rev(ersing) RNA binding: RNA-binding inhibitors based on a bilaterally substituted p-terphenylene scaffold (green) project their substituents in a broad spatial angle and reproduce the interactions of a protein α-helix (red) embedded in its RNA receptor.
- Gonzalez-Bulnes, Luis,Ibanez, Ignacio,Bedoya, Luis M.,Beltran, Manuela,Catalan, Silvia,Alcami, Jose,Fustero, Santos,Gallego, Jose
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supporting information
p. 13405 - 13409
(2014/01/06)
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- Synthesis of stable and soluble one-handed helical poly(substituted acetylene)s without chiral pendant groups via polymer reaction in membrane state
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A soluble and stable one-handed helical conjugated polymer without the coexistence of any other chiral moieties was successfully synthesized by asymmetric-induced polymerization of a chiral monomer having two hydroxyl groups followed by desubstitution of
- Abe, Yunosuke,Aoki, Toshiki,Jia, Hongge,Hadano, Shingo,Namikoshi, Takeshi,Kakihana, Yuriko,Liu, Lijia,Zang, Yu,Teraguchi, Masahiro,Kaneko, Takashi
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experimental part
p. 2129 - 2133
(2012/07/31)
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- The role of Zn-OR and Zn-OH nucleophiles and the influence of para-substituents in the reactions of binuclear phosphatase mimetics
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Analogues of the ligand 2,2′-(2-hydroxy-5-methyl-1,3-phenylene) bis(methylene)bis((pyridin-2-ylmethyl)azanediyl)diethanol (CH3H 3L1) are described. Complexation of these analogues, 2,6-bis(((2-methoxyethyl)(pyridin-2-ylmethyl)amino)m
- Daumann, Lena J.,Dalle, Kristian E.,Schenk, Gerhard,McGeary, Ross P.,Bernhardt, Paul V.,Ollis, David L.,Gahan, Lawrence R.
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experimental part
p. 1695 - 1708
(2012/03/22)
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- Formation and characterization of water-soluble hetero capsules derived from multiple ionic interactions
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We now report the formation and characterization of water-soluble hetero-capsules 12 resulting from the ionic interactions between positively charged flexible aniline hydrochloride 1 and negatively charged phosphonate 2 having rigid homooxacalix[3]arene u
- Kusukawa, Takahiro,Katano, Chikako,Kim, Chizuru
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scheme or table
p. 1492 - 1501
(2012/03/08)
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- Chiral teleinduction in asymmetric polymerization of 3,5-bis(hydroxymethyl) phenylacetylene having a chiral group via a very long and rigid spacer at 4-position
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A new polymer prepared by polymerization of 3,5-bis-(hydroxymethyl) phenylacetylene having a chiral menthyl group via a very long and rigid spacer by an achiral rhodium complex with triethylamine as an initiator showed strong CD absorptions assigned to th
- Abe, Yunosuke,Aoki, Toshiki,Jia, Hongge,Hadano, Shingo,Namikoshi, Takeshi,Kakihana, Yuriko,Liu, Lijia,Zang, Yu,Teraguchi, Masahiro,Kaneko, Takashi
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supporting information; scheme or table
p. 244 - 246
(2012/06/01)
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- Two modes of asymmetric polymerization of phenylacetylenes having an L -amino alcohol residue and two hydroxy groups
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Four novel chiral phenylacetylenes having an L-amino alcohol residue and two hydroxymethyl groups were synthesized and polymerized by an achiral catalyst ((nbd)Rh+[η6-(C6H5)B -(C6H5)3]) or a chiral catalytic system ([Rh(nbd)Cl]2/(S)- or (R)-phenylethylamine ((S)- or (R)-PEA)). The two resulting polymers having an L-valinol or L-phenylalaninol residue showed Cotton effects at wavelengths around 430 nm. This observation indicated that they had an excess of one-handed helical backbones. Positive and negative Cotton effects were observed only for the polymers having an L-valinol residue produced by using (R)- and (S)-PEA as a cocatalyst, respectively, although the monomer had the same chirality. Even when the achiral catalyst was used, the two resulting polymers having an L-valinol or L-phenylalaninol residue showed Cotton effects despite the long distance between the chiral groups and the main chain. We have found the first example of a new type of chiral monomer, that is, a chiral phenylacetylene monomer having an L-amino alcohol residue and two hydroxy groups that was suitable for both modes of asymmetric polymerization, that is, the helix-sense-selective polymerization (HSSP) with the chiral catalytic system and the asymmetric-induced polymerization (AIP) with the achiral catalyst. The other two monomers having L-alaninol and L-tyrosinol were found to be unsuitable to neither HSSP nor AIP because of their polymers' low solubility.
- Jia, Hongge,Li, Jun,Zang, Yu,Aoki, Toshiki,Teraguchi, Masahiro,Kaneko, Takashi
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p. 5134 - 5143
(2013/01/15)
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- VISIBLE LIGHT ABSORBERS FOR OPHTHALMIC LENS MATERIALS
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Azo compounds that block visible light are disclosed. These light absorbers are particularly suitable for use in intraocular lens materials.
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- Synthesis and helix-sense-selective polymerization of a novel phenylacetylene having a trisiloxanyl group and two hydroxyl groups and enantioselective permeability of the resulting chiral polymeric membrane: Effect of the trisiloxanyl group on the polymerization and enantioselective permeability
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To develop a new phenylacetylene monomer suitable for helix-sense-selective polymerization (HSSP) we reported previously and to improve the efficiency of the HSSP and membrane performance of the resulting polymer, a novel phenylacetylene having a trisiloxanyl group (S3BDHPA) was synthesized and polymerized by using a chiral catalytic system and enantioselectivity in permeation of its membrane was examined. S3BDHPA was suitable for the HSSP and the CD absorption of poly(S3BDHPA) was stronger and more stable than that of the corresponding polymer having no siloxanyl groups. In addition, enantioselectivity in permeation of poly(S3BDHPA) was much higher than that of a polymer membrane having no siloxanyl groups. They are thought to be caused by the flexibility and hydrophobicity of the trisiloxane groups.
- Liu, Lijia,Oniyama, Yoshiyuki,Zang, Yu,Hadano, Shingo,Aoki, Toshiki,Teraguchi, Masahiro,Kaneko, Takashi,Namikoshi, Takeshi,Marwanta, Edy
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scheme or table
p. 2460 - 2464
(2011/11/12)
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- Three mechanisms of asymmetric polymerization of phenylacetylenes having an l-amino ether residue and two hydroxy groups
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Three novel chiral phenylacetylenes having an octyloxyethanolamine residue derived from a l-aminoalcohol and two hydroxymethyl groups were synthesized and polymerized by two achiral catalysts ((nbd) Rh+[I?6-(C6H5)B -(C6H5)3] and [Rh(nbd)Cl] 2/triethylamine (TEA)) and a chiral catalytic system ([Rh(nbd)Cl]2/(S)- or (R)-phenylethylamine ((S)- or (R)-PEA)). All of the resulting polymers showed Cotton effects at wavelengths around 430 nm. This observation indicated that they had an excess of one-handed helical backbones. Positive and negative Cotton effects were observed for the polymers having an l-valinol residue produced by using (S)- and (R)-PEA as a cocatalyst, respectively, although the monomers had the same chirality. The two polymers having an l-alaninol or l-phenylalaninol residues obtained by using (S)- and (R)-PEA as a cocatalyst showed CD absorptions with identical signs. Therefore, we found that the chiral monomer having an l-valinol residue was suitable for both modes of asymmetric polymerization, that is, helix-sense-selective polymerization (HSSP) with the chiral catalytic system and asymmetric-induced polymerization (AIP) with the achiral catalysts. However, the other two monomers having an l-alaninol or l-phenylalaninol residue were not suitable for HSSP because the helix sense could not be controlled by the chirality of PEA. To explain the unexpected behaviors in the asymmetric polymerizations of the two chiral monomers having a chiral bidentate ligand, a novel third mechanism of asymmetric polymerization, that is, self-helix-sense-selective polymerization (SHSSP), is proposed in this Article. This Article discusses the contribution of the three mechanisms (AIP, HSSP, and SHSSP) in asymmetric polymerizations of the three monomers.
- Jia, Hongge,Teraguchi, Masahiro,Aoki, Toshiki,Abe, Yunosuke,Kaneko, Takashi,Hadano, Shingo,Namikoshi, Takeshi,Ohishi, Tomoyuki
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scheme or table
p. 8353 - 8362
(2011/11/12)
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- New achiral phenylacetylene monomers having an oligosiloxanyl group most suitable for helix-sense-selective polymerization and for obtaining good optical resolution membrane materials
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To develop new phenylacetylene monomers more suitable for helix-sense-selective polymerization (HSSP) we reported previously and to improve the efficiency of the HSSP and membrane performance of the resulting polymers, novel phenylacetylenes having a flexible oligosiloxanyl group (SnBDHPA)together with the other related three series of monomers were synthesized and polymerized by using a chiral catalytic system and enantioselectivity in permeation of the membranes from the resulting chiral polymers were examined. SnBDHPA was the most suitable for the HSSP and the CD absorptions (G values) of poly- (SnBDHPA) were stronger and more stable than those of the corresponding polymers having rigid alkyl groups. The polymers could be fabricated to flexible self-supporting membranes by using solvent-casting method. In addition, enantioselectivity in permeation of one of poly(SnBDHPA) membranes was much higher than that of a poly(phenylacetylene) membrane having alkyl groups. This was because the polymers having oligosiloxane groups had high regularity of structures, i.e., chemical structures of the macromolecules such as one handedness and high order structures such as columnar contents in the membranes, and the membranes were flexible and had almost no defects. These good properties as optical resolution membrane materials were caused by flexibility, hydrophobicity, and bulkiness of the oligosiloxane chains. S3BDHPA having a trisiloxanyl group was found to be the best monomer for the HSSP and for obtaining good optical resolution membrane materials.
- Liu, Lijia,Zang, Yu,Hadano, Shingo,Aoki, Toshiki,Teraguchi, Masahiro,Kaneko, Takashi,Namikoshi, Takeshi
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scheme or table
p. 9268 - 9276
(2011/11/14)
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- Wet THF as a suitable solvent for a mild and convenient reduction of carbonyl compounds with NaBH4
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NaBH4 in wet THF can readily reduce varieties of carbonyl compounds such as aldehydes, ketones, conjugated enones, acyloins, and α-diketones to their corresponding alcohols in good to excellent yields. Reduction reactions were performed at room temperature or under reflux condition. In addition, the chemoselective reduction of aldehydes over ketones was accomplished successfully with this reducing system.
- Zeynizadeh, Behzad,Behyar, Tarifeh
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p. 307 - 315
(2007/10/03)
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- CHIRAL SENSOR
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An optically active compound having an unsaturated bond at an optically active binding site, wherein the unsaturated bond and a fluorescent substituent or a substituent capable of imparting fluorescence are united in a conjugated manner; and a chiral sens
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Page/Page column 10
(2008/06/13)
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- Reduction of carbonyl compounds with NaBH4 under ultrasound irradiation and aprotic condition
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A variety of carbonyl compounds are reduced to their corresponding alcohols with sodium borohydride under ultrasound irradiation and aprotic condition. Reduction reactions are performed in THF at room temperature or under reflux condition. The product alcohols were obtained in good to excellent yields. The chemoselective reduction of aldehydes over ketones was achieved successfully with this system.
- Zeynizadeh, Behzad,Yahyaei, Saiedeh
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p. 704 - 710
(2007/10/03)
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- Modified hydroborate agent: (2,2′-bipyridyl)(tetrahydroborato)zinc complex, [Zn(BH4)2(bpy)], as a new, stable, efficient ligand-metal hydroborate and chemoselective reducing agent
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(2,2′-Bipyridyl)(tetrahydroborato)zinc complex, [Zn(BH4)2(bpy)], is a new white stable compound which has been used for efficient reduction of variety of carbonyl compounds such as aldehydes, ketones, acyloins, α-diketones and α, β-unsaturated carbonyl compounds (1,2-reduction) to their corresponding alcohols in acetonitrile at room temperature. Excellent chemoselectivity was also observed for the reduction of aldehydes over ketones with this reducing agent.
- Zeynizadeh, Behzad
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p. 317 - 326
(2007/10/03)
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- Mild and efficient method for reduction of aldehydes and ketones with NaBH4 in the presence of Dowex1-x8
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Various aldehydes and ketones are reduced efficiently to alcohols with NaBH4/Dowex1-x8.
- Zeynizadeh, Behzad,Shirini, Farhad
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p. 335 - 339
(2007/10/03)
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- Titanyl Acetylacetonate as an Efficient Catalyst for a Mild and Convenient Reduction of Carbonyl Compounds with NaBH4 under Aprotic Condition
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Titanyl acetylacetonate, TiO(acac)2, is used as an efficient catalyst for the reduction of carbonyl compounds with sodium borohydride under aprotic condition. Reduction reactions are performed in CH3CN and THF. The corresponding alcohols are obtained in high to excellent yields and the chemoselective reduction of aldehydes over ketones is achieved successfully.
- Zeynizadeh, Behzad
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p. 1220 - 1226
(2007/10/03)
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- Helix-sense-selective polymerization of phenylacetylene having two hydroxy groups using a chiral catalytic system
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We have found a simple and novel synthetic method for obtaining a chiral polymer from an achiral monomer by using a chiral catalytic system. The chirality of the polymer was caused only by a one-handed helical backbone, and the polymer had no other chiral
- Aoki, Toshiki,Kaneko, Takashi,Maruyama, Naoki,Sumi, Atsushi,Takahashi, Masahiko,Sato, Takashi,Teraguchi, Masahiro
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p. 6346 - 6347
(2007/10/03)
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- Phenol-containing macrocyclic diamides as new catalysts in the highly regioselective conversion of epoxides to β-hydroxy thiocyanates
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The regioselective ring-opening reactions of some epoxides with ammonium thiocyanate in the presence of a series of new phenol-containing macrocyclic diamides and also dibenzo-18-crown-6-, 18-crown-6-, benzo-15-crown-5-, and pyridine-containing macrocyclic diamide have been studied. The epoxides were subject to cleavage by NH4SCN in the presence of these catalysts under mild reaction conditions in various aprotic solvents. In this study, reagents and conditions have been discovered with which the individual β-hydroxy thiocyanates can be synthesized in high yield and with more than 90% regioselectivity. The results can be discussed in terms of a four-step mechanism: (1) formation of complex between catalyst and NH4SCN, (2) release of SCN- nucleophile from the complex, (3) reaction of the active nucleophile at the less sterically hindered site in the epoxide, and (4) regeneration of catalyst. The major advantages of this method are as follows: (1) high regioselectivity, (2) simple regeneration of catalyst, (3) its reuse through several cycles without a decrease in activity, and (4) ease of workup of the reaction.
- Sharghi,Nasseri,Niknam
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p. 7287 - 7293
(2007/10/03)
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- Preparation of functionalised aryl alkynes as precursors to extended cyclophanes
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The preparation of 2,6-substituted arylhalides and triflates is described. These compounds are suitable precursors for cyclophane formation. (C) 2000 Elsevier Science Ltd.
- Crisp, Geoffrey T.,Turner, Peter D.
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p. 407 - 415
(2007/10/03)
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- Facile synthesis of calix[5]arenes with three different upper rim substituents
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Four calix[5]arenes, which have three different substituents at the upper rim of calix, are synthesized by the '3 + 2' fragmentation condensation reaction. An equimolar mixture of p-substituted phenol trimer (BCB) and 2,2'-bishydroxymethyl p-substituted p
- No, Kwanghyun,Kwon, Kyoung Mee
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p. 1293 - 1295
(2007/10/03)
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- Syntheses of biphenyl analogues of AP7, a new class of competitive N-methyl-D-aspartate (NMDA) receptor antagonists
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Affinities for the NMDA receptor were measured ([3H]CGP-39653 binding assay) and competitive NMDA antagonistic potencies determined in a functional test (rat neocortical slice preparation). Structure-activity relationships show that attachment
- Muller,Kipfer,Lowe,Urwyler
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p. 2026 - 2035
(2007/10/02)
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- One- and Two-Dimensional NMR Study of Resol Phenol-Formaldehyde Prepolymer Resins
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A one- and two-dimensional NMR study was performed on three commercial resol phenol-formaldehyde (PF) prepolymer resins. 1H, 13C, CSCM and DQF COSY NMR spectral data, in acetone-d6, were obtained on each resin and on PF model compounds: phenol, five methylolphenols, four diphenylmethanes, two formals, two dibenzyl ethers and two dibenzylamines.Gated-decoupled 13C experiments, using 2,4,6-trimethylphenol as internal standard, were used to quantitate the major components present in each of the three resins.The major chemical differences of the three resins were noted.A DQF COSY method was developed that allowed the qualitative identification of most of the major phenolic components present in each of the PF resins. - Keywords: NMR; 1H NMR; 13C NMR; Phenol-formaldehyde resins
- Fisher, Thomas H.,Chao, Ping,Upton, G. Cindy,Day, Anthony J.
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p. 717 - 723
(2007/10/02)
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- Facile synthesis of calix[4]arenes in ABAC type upper rim substitution
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Calix[4]arenes with three different substituents in ABAC pattern at the upper rim of calix are synthesized by '3 + 1' fragmentation condensation reaction between trimer of p-substituted phenol (ABA) and 2,6-bishydroxymethylated p-substituted phenol (C).
- Kwanghyun, No,Jong, Eun Kim,Kyoung, Mee Kwon
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p. 8453 - 8456
(2007/10/02)
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- SYNTHESIS OF 2,6-DIFORMYL-4-TRIFLUOROMETHYLPHENOL
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A convenient method for the synthesis of the previously unknown 2,6-diformyl-4-trifluoromethylphenol is reported by a seven-stage synthesis.A methyl ether is used to protect the phenol moiety and the key-step involves a copper-mediated trifluoromethylatio
- Leroy, Jacques,Wakselman, Claude
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- The Synthesis of Hetero-Halogenated Derivatives of Phloroglucide Analogues
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A short synthesis of the title compounds is reported.Most of the compounds prepared were found to be active against a number of pathogenic microorganisms in vitro.
- Moshfegh, Ali Akbar,Mazandarani, Behnaz,Nahid, Azarmidokht,Hakimelahi, Gholam Hosein
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p. 1229 - 1232
(2007/10/02)
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