5233-04-5Relevant articles and documents
Preparation method of 3, 5-dichloroo-phenylenediamine
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, (2021/02/20)
The invention relates to an industrial preparation method of 3, 5-dichloroo-phenylenediamine, which comprises the following steps of: by using 3, 5-dichloroaniline as an initial raw material, carryingout protection, nitrification, deprotection and reduction reaction to synthesize the 3, 5-dichloroo-phenylenediamine. The 3, 5-dichloroo-phenylenediamine obtained in the process is a brown solid, thepurity is 97.5%, the conversion rate of raw materials in each step reaches 100%, the total yield of the whole process reaches 52.7%, 3, 5-dichloroaniline is used as an initial raw material, the positioning property is good, the impurity is few, and the purification is easy.
Highly selective hydrogenation of aromatic chloronitro compounds to aromatic chloroamines with ionic-liquid-like copolymer stabilized platinum nanocatalysts in ionic liquids
Yuan, Xiao,Yan, Ning,Xiao, Chaoxian,Li, Changning,Fei, Zhaofu,Cai, Zhipeng,Kou, Yuan,Dyson, Paul J.
experimental part, p. 228 - 233 (2011/03/17)
Platinum nanoparticles (PtNPs stabilized by an ionic-liquid-like-copolymer (IP) immobilized in various ionic liquids (ILs)) effectively catalyze the selective hydrogenation of aromatic chloronitro compounds to aromatic chloroamines, a reaction of considerable commercial significance. The preparation of 2,4-dichloro-3-aminophenol (DAP) has been primarily studied due to its important industrial applications. DAP is usually prepared from 2,4-dichloro-3-nitrophenol (DNP) by reduction with hydrogen using Ni- or Pt-based catalysts. Compared to reactions in molecular (organic) solvents, the ILs system provides superior selectivity with functionalized ILs containing an alcohol group demonstrating the best recyclability, and ultimately achieving a turnover number of 2025 which is 750 fold higher than Raney nickel catalyst. A universal catalyst-ionic liquid system for the conversion of aromatic chloronitro compounds to aromatic chloroamines was also established. TEM, XPS, IR spectroscopy were used to characterize the morphology of the nanocatalysts allowing their structure to be correlated to their activity.
QUINOXALINE COMPOUNDS AND THEIR PREPARATION AND USE
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, (2008/06/13)
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