Ionic liquid as catalyst and solvent: the remarkable effect of a basic ionic liquid, [bmIm]OH on Michael addition and alkylation of active methylene compounds
作者:Brindaban C. Ranu、Subhash Banerjee、Ranjan Jana
DOI:10.1016/j.tet.2006.10.077
日期:2007.1
ketones, carboxylic esters and nitriles. It further catalyzes the addition of thiols to α,β-acetylenic ketones and alkylation of 1,3-dicarbonyl and -dicyano compounds. The Michael addition to α,β-unsaturated ketones proceeds in the usual way, giving the monoaddition products, whereas addition to α,β-unsaturated esters and nitriles leads exclusively to the bis-addition products. The α,β-acetylenic ketones
Base catalytic activity of alkaline earth MOFs: a (micro)spectroscopic study of active site formation by the controlled transformation of structural anions
作者:P. Valvekens、D. Jonckheere、T. De Baerdemaeker、A. V. Kubarev、M. Vandichel、K. Hemelsoet、M. Waroquier、V. Van Speybroeck、E. Smolders、D. Depla、M. B. J. Roeffaers、D. De Vos
DOI:10.1039/c4sc01731e
日期:——
The selective decomposition of structural nitrate anions in alkaline earth MOFs generates highly dispersed base sites with catalytic applications.
在碱土金属MOFs中对结构硝酸根离子进行选择性分解,产生高度分散的碱性基位点,具有催化应用。
Rhodium-catalyzed michael additions of activated nitriles to α,β - unsaturated esters
The Michael additions of activatednitriles to methyl acrylate (MA) and methyl vinyl ketone (MVK) proceeds with fair to high yields (46–92%) in the presence of catalytic amount of HRh(CO)(PPh3)31 under mild eaction conditions.
Metal-dioxidoterephthalate MOFs of the MOF-74 type: Microporous basic catalysts with well-defined active sites
作者:Pieterjan Valvekens、Matthias Vandichel、Michel Waroquier、Veronique Van Speybroeck、Dirk De Vos
DOI:10.1016/j.jcat.2014.06.006
日期:2014.8
The hybrid frameworks M(2)dobdc (dobdc(4-) = 2,5-dioxidoterephthalate, M2+ = Mg2+, Co2+, Ni2+, Cu2+ and Zn2+), commonly known as CPO-27 or MOF-74, are shown to be active catalysts in base-catalyzed reactions such as Knoevenagel condensations or Michael additions. Rather than utilizing N-functionalized linkers as a source of basicity, the intrinsic basicity of these materials arises from the presence of the phenolate oxygen atoms coordinated to the metal ions. The overall activity is due to a complex interplay of the basic properties of these structural phenolates and the reactant binding characteristics of the coordinatively unsaturated sites. The nature of the active site and the order of activity between the different M(2)dobdc materials were rationalized via computational efforts; the most active material, both in theory and in experiment, is the Ni-containing variant. The basicity of Ni(2)dobdc was experimentally proven by chemisorption of pyrrole and observation by IR spectroscopy. (C) 2014 Elsevier Inc. All rights reserved.
[EN] POLYMER SUPPORTED BORON CATALYST AND METHOD FOR PRODUCING MICHAEL ADDITION REACTION PRODUCT USING THAT CATALYST<br/>[FR] CATALYSEUR À BASE DE BORE SUPPORTÉ SUR UN POLYMÈRE ET PROCÉDÉ DE PRODUCTION D'UN PRODUIT DE LA RÉACTION D'ADDITION DE MICHAËL UTILISANT CE CATALYSEUR