- Novel environment-friendly production process for preparing amine product and H - acid through silane chemical reduction of several nitro compounds
-
The invention relates to the field of new materials for fine chemicals, and relates to a reduction reaction of a series of nitro compounds, in particular to m-nitroaniline. Several particular important amine compounds such as m-phenylenediamine, 5 - amino o-cresol, 2 - methyl p-phenylenediamine, 1/2 - naphthylamine, H - acid amine and 2, 4, 6 - trimethyl-M-phenylenediamine are prepared from the corresponding mono-or double-nitro compound precursors with a new environmental protection production process technology of and acids derived from the novel process technology. H.
- -
-
Paragraph 0034-0036
(2021/09/08)
-
- Hyperbranched Poly(ester-enamine) from Spontaneous Amino-yne Click Reaction for Stabilization of Gold Nanoparticle Catalysts
-
Hyperbranched polymers have garnered much attention due to attractive properties and wide applications, such as drug-controlled release, stimuli-responsive nano-objects, photosensitive materials and catalysts. Herein, two types of novel hyperbranched poly(ester-enamine) (hb-PEEa) were designed and synthesized via the spontaneous amino-yne click reaction of A2 monomer (1, 3-bis(4-piperidyl)-propane (A2a) or piperazine (A2b)) and B3 monomer (trimethylolpropanetripropiolate). According to Flory's hypothesis, gelation is an intrinsic problem in an ideal A2+B3 polymerization system. By controlling the polymerization conditions, such as monomer concentration, molar ratio and rate of addition, a non-ideal A2+B3 polymerization system can be established to avoid gelation and to synthesize soluble hb-PEEa. Due to abundant unreacted alkynyl groups in periphery, the hb-PEEa can be further functionalized by different amino compounds or their derivates. The as-prepared amphiphilic PEG-hb-PEEa copolymer can readily self-assemble into micelles in water, which can be used as surfactant to stabilize Au nanoparticles (AuNPs) during reduction of NaBH4 in aqueous solution. As a demonstration, the as-prepared PEG-hb-PEEa-supported AuNPs demonstrate good dispersion in water, solvent stability and remarkable catalytic activity for reduction of nitrobenzene compounds.
- Yang, Dong,Liu, Pei,Lin, Wanran,Sui, Shanglin,Huang, Long-Biao,Xu, Ben Bin,Kong, Jie
-
supporting information
p. 2499 - 2504
(2020/07/13)
-
- Preparation method of 5-amino-2-methylphenol
-
The invention relates to a preparation method of 5-amino-2-methylphenol, comprising the steps of (1) adding an alkaline liquid into a high-pressure kettle, adding an alcohol solution containing 3-chloro-4-methylaniline, adding a catalyst, raising the temperature to 150-200 DEG C, and holding the temperature for reacting; (2) after reacting, cooling, recycling ethyl alcohol, and filtering to obtaina crude product; (3) purifying the crude product to obtain a fine product. The preparation method is simple; product post-processing is simple; low environmental pollution is caused; the prepared 5-amino-2-methylphenol has high quality; environment pollution is reduced at the premise of improved product quality, the product production is clean and environmentally friendly, and the product is moresuitable for batch production.
- -
-
Paragraph 0030-0032; 0036; 0037
(2018/05/07)
-
- Constructing magnetic Si-C-Fe hybrid microspheres for room temperature nitroarenes reduction
-
In this work, we present, for the first time, the synthesis and characterization of magnetic Si-C-Fe hybrid microspheres and their catalytic performance in room temperature reduction of 4-nitrophenol as a representative sustainable process for converting environmental pollutants to fine chemicals. The ferrocene-modified polydivinylbenzene (Fc-PDVB) precursor was synthesized by Pt-catalyzed hydrosilylation between the residual vinyl groups on the PDVB surface and 1,1′-bis (dimethylsilyl)ferrocene, where further pyrolysis led to the formation of Fe nanocrystal-containing Si-C-Fe hybrid microspheres. The precursor and hybrid microspheres were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), BET surface area/porosity, powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), magnetic properties and MAS solid-state NMR measurements. The ultimate microspherical catalyst exhibited nano- and meso-pores, a high specific surface area (i.e., 347.9 m2 g-1) and good ferromagnetic properties. Efficient catalytic activity (TOF: 0.163 s-1), 100% selectivity (to 4-aminophenol) and excellent reusability (with easy separation) have been delivered. The achieved microspheres outperform a number of nanomaterials such as supported noble metal particles, composites, monoliths and sheets. We have confirmed by DFT calculations that the activation of 4-nitrophenol via its weak non-covalent interaction with the sp2 carbon domain of Si-C-Fe hybrid microspheres contributed to the superior performance which can be extended to a range of nitrobenzenes.
- Zhang, Xiaofei,Chen, Lixin,Yun, Jin,Wang, Xiaodong,Kong, Jie
-
p. 10986 - 10997
(2017/07/11)
-
- Substituted ortho-aminophenols, process for preparing them and their use for the oxidatin dyeing of keratinous fibres
-
5-Substituted ortho-aminophenols of formula: STR1 in which: R1 denotes a hydrogen atom, an alkyl radical having 1 to 4 carbon atoms or a hydroxyalkyl radical having 1 to 4 carbon atoms; and R2 denotes, independently of R1, an alkyl radical having 1 to 4 carbon atoms, an alkoxy radical having 1 to 4 carbon atoms or a benzyl radical; the addition salts with an acid and the phenates, and dyeing composition containing a compound of formula (I) or a salt or a phenate of such a compound. The 5-substituted ortho-aminophenols enable hair to be dyed in a rich spectrum of hues having good durability.
- -
-
-
- Organic synthesis
-
The conversion of ortho-hydroxylated Mannich bases to the corresponding methylated compounds, e.g., cresols, can be effectively carried out using a novel hydrogenation technique.
- -
-
-
- Hydroxylation directe d'anilines en aminophenols
-
Anilines react with hydrogen peroxide in SbF5-HF to give aminophenols.The formation of the products can be accounted for by the reaction of the electrophile H3O2+ on the anilinium ions.For compounds 1a-4a, the reaction yields three possible aminophenols, the meta isomer being the major product.The process is more selective with ortho toluidine 5a and para toluidine 6a, giving aminophenol(s) 5c (42percent)) and 5e (21percent), and 6c (71percent), respectively.With meta toluidine 7a, only aminophenol 7d (35percent) can be isolated from the complex reaction mixture, ring substitution pattern of the substrate favoring para hydroxylation.
- Jacquesy, Jean-Claude,Jouannetaud, Marie-Paule,Morellet, Guy,Vidal, Yves
-
p. 625 - 629
(2007/10/02)
-
