Hydrogen-transfer reduction of carbonyl compounds promoted by nickel nanoparticles
摘要:
Nickel(0) nanoparticles, generated from nickel(II) chloride, lithium powder and a catalytic amount of 4,4-di-tert-butylbiphenyl (DTBB) in THF at room temperature, have been found to promote the reduction of a variety of ketones and aldehydes by transfer hydrogenation using isopropanol as the hydrogen donor. The nickel nanoparticles were characterised and could be re-utilised with a good performance in the absence of a base. A mechanistic study demonstrates that the reaction proceeds through a dihydride-type mechanism. (C) 2007 Elsevier Ltd. All rights reserved.
Polymer-supported gadolinium triflate as a convenient and efficient Lewis acid catalyst for acetylation of alcohols and phenols
作者:Hyo-Jin Yoon、Sang-Myung Lee、Jong-Ho Kim、Hong-Jun Cho、Jung-Woo Choi、Sang-Hyeup Lee、Yoon-Sik Lee
DOI:10.1016/j.tetlet.2008.03.005
日期:2008.5
(CMPS-IM-Gd) catalyst was prepared from chloromethyl polystyrene (CMPS) resin using a simple and convenient procedure. This polymeric catalyst was used as an efficient Lewisacidcatalyst for the acetylation of various alcohols and phenols with acetic anhydride, affording high yields under mild conditions. The reaction was completed in a short period of time with small amounts of the catalyst. The catalyst
[EN] BENZO[H]QUINOLINE LIGANDS AND COMPLEXES THEREOF<br/>[FR] LIGANDS DE BENZO[H]QUINOLÉINE ET COMPLEXES DE CEUX-CI
申请人:JOHNSON MATTHEY PLC
公开号:WO2016193761A1
公开(公告)日:2016-12-08
The present invention provides substituted tridentate benzo[h]quinoline ligands and complexes thereof. The invention also provides the preparation of the ligands and the respective complexes, as well as to processes for using the complexes in catalytic reactions.
[EN] PROCESS FOR THE PREPARATION OF NITRATE ACID ESTER OF ORGANIC COMPOUNDS<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION D'ESTER D'ACIDE DE NITRATE DE COMPOSÉS ORGANIQUES
申请人:NICOX SA
公开号:WO2012152438A1
公开(公告)日:2012-11-15
The present invention relates to a one-step process for the synthesis of nitric acid esters or 15N isotopically labeled nitrate esters of organic compounds starting from the correspondent alcohols. Formula (I).
[EN] MALE CONTRACEPTIVE COMPOSITIONS AND METHODS OF USE<br/>[FR] COMPOSITIONS CONTRACEPTIVES POUR LES HOMMES ET PROCÉDÉS D'UTILISATION ASSOCIÉS
申请人:DANA FARBER CANCER INST INC
公开号:WO2011143657A1
公开(公告)日:2011-11-17
The invention relates to compositions and methods for effecting male contraception.
这项发明涉及用于实现男性避孕的组合物和方法。
Continuous flow synthesis of menthol <i>via</i> tandem cyclisation–hydrogenation of citronellal catalysed by scrap catalytic converters
作者:Alessio Zuliani、Camilla Maria Cova、Roberta Manno、Victor Sebastian、Antonio A. Romero、Rafael Luque
DOI:10.1039/c9gc03299a
日期:——
A continuousflowsynthesis of menthol starting from citronellal catalysed by scrap catalytic converters is reported. The reaction was conducted in a tandem system connecting in series two catalytic systems, with the first having Lewis acid properties (favouring the cyclisation of citronellal to isopulegols) and the second having hydrogenation catalytic activity (catalysing the hydrogenation of isopulegols
报导了由废催化转化器催化的从香茅醛开始的薄荷醇的连续流合成。该反应在串联的两个催化体系串联的串联系统中进行,第一个具有路易斯酸性质(有利于香茅醛向异果酚的环化),第二个具有氢化催化活性(催化异胡酚的氢化成薄荷醇)。路易斯酸催化剂的制备是通过在一个废料支撑氧化铁纳米颗粒,即废料的催化转化器(粪)的陶瓷芯通过微波辅助方法。最重要的是,含有低残留贵金属含量的SCATs可以直接在第二步中用作氢化催化剂。进行反应以研究各种反应参数(T,p和流速)对产率和对(-)-薄荷醇的选择性的影响。在最佳反应条件下(在0.1 mL min -1的流速下,在373 K和413 K分别用于环化和氢化步骤)下,> 99%的(+)-香茅醛转化为(-)-薄荷醇的转化率为77最终产率为%。