5930-28-9Relevant articles and documents
Synthesis method of 2, 6-dichloro-4-aminophenol
-
Paragraph 0023; 0031; 0034; 0035; 0038, (2021/06/12)
The invention discloses a synthesis method of 2, 6-dichloro-4-aminophenol, and belongs to the field of preparation of pesticide, medicine and dye intermediates, 2, 6-dichloro-4-aminophenol is obtained by adopting paranitroaniline as a raw material through the steps of chlorination, diazonium hydrolysis, hydrogenation and the like, methanol is adopted as a solvent for chlorination, filtrate can be repeatedly used, and the use of a large amount of acid water is reduced; toluene is selected as a solvent in diazotization, diazonium liquid is directly layered after being hydrolyzed, an organic layer is separated out, water vapor distillation is not needed, and the distillation risk and energy consumption are reduced; toluene is selected as a hydrogenation solvent, and an organic layer separated after the diazonium liquid is hydrolyzed is directly hydrogenated, so that the process flow is simplified.
Synthesis method of aminophenol
-
Paragraph 0077-0138, (2020/07/13)
The invention provides a synthesis method of aminophenol. According to the method, by reacting nitrophenol with hydrogen under the conditions of an auxiliary agent and a solvent, an aminophenol product with high selectivity and yield can be prepared, the auxiliary agent can well control the reaction depth of nitrophenol and hydrogen, thereby inhibiting the side reaction, enhancing the purity of the final product, overcoming the problems of poor selectivity and high three-waste amount in the common hydrazine hydrate, sodium hydrosulfite and other reducing agents in the prior art, and having higher industrial application value.
Gold nanodots self-assembled polyelectrolyte film as reusable catalyst for reduction of nitroaromatics
Viswanathan, Perumal,Ramaraj, Ramasamy
, (2018/02/09)
Separation of homogeneous catalyst from the reaction mixture is a crucial and difficult process in any catalytic process. To address this issue, a new class of multifunctional catalyst in the form of film was developed using a facile approach to enjoy the advantages of homogeneous catalyst with the versatility of heterogeneous catalyst. To achieve the same, methionine-capped gold nanodots (AuNDs) were self-assembled on a cationic polyelectrolyte modified glass plate for the catalytic reduction of nitro functional groups in the presence of olefinic double bond at mild conditions. Separation of this reusable catalytic film from the reaction mixture is very simple and advantageous when compared to the currently available and conventional catalytic systems. Kinetics of nitro reduction was monitored using absorption spectroscopy and the product formation was confirmed by 1H and 13CNMR analyses. Prepared AuNDs catalyst was characterized using UV-Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), cyclic voltammetry and atomic force microscopy (AFM) techniques. Graphical Abstract: SYNOPSIS?Colloidal gold nanoparticles are efficient catalysts for organic reactions. But the removal of homogeneous gold colloids from the reaction mixture is very difficult. To address this issue, gold nanodots were synthesized and self-assembled over polyelectrolyte film to form catalytic plates. Removal of these reusable catalytic plates from the reaction mixture is facile.[Figure not available: see fulltext.].