Tellurium(IV) tetrachloride catalysed facile knoevenagel reaction
作者:Rahat H. Khan、Raj K. Mathur、Anil C. Ghosh
DOI:10.1080/00397919608086741
日期:1996.2
Abstract Non-enolisable aldehydes (I) and active methylene compounds (II) react in the presence of tellurium(IV) tetrachloride (catalytic) to give the corresponding α, β-unsaturated carbonyl compounds (III) in excellent yields and high purity.
摘要 不可烯醇化的醛 (I) 和活性亚甲基化合物 (II) 在四氯化碲 (IV)(催化)存在下反应,以优异的收率和高纯度反应生成相应的 α, β-不饱和羰基化合物 (III)。
Phosphane-Catalyzed Knoevenagel Condensation: A Facile Synthesis ofα-Cyanoacrylates andα-Cyanoacrylonitriles
作者:Jhillu S. Yadav、Basi V. Subba Reddy、Ashok K. Basak、Boddapati Visali、Akkirala Venkat Narsaiah、Kommu Nagaiah
DOI:10.1002/ejoc.200300513
日期:2004.2
Triphenylphosphane (TPP) has been utilized as a novel and efficient catalyst for the Knoevenagelcondensation of aldehydes with acidic methylene compounds such as ethyl cyanoacetate and malononitrile to afford substituted olefins. The reaction proceeds smoothly under mild and solvent-free conditions and the products are obtained in excellent yields with an E-geometry. This method is applicable for
An Eco‐Friendly Synthesis of Electrophilic Alkenes Catalyzed by Dimethylaminopyridine Under Solvent‐Free Conditions
作者:A. Venkat Narsaiah、A. K. Basak、B. Visali、K. Nagaiah
DOI:10.1081/scc-200026625
日期:2004.1.1
Electrophilic olefins were synthesized in solvent‐free condition using DMAP (10%mol) as catalyst in excellent yield and E‐geometry. The various aldehydes which are aliphatic, aromatic, and heterocyclics underwent smoothly for Knoevenagel condensation with different active methylene compounds. #IICT Communication No. 030900.
亲电烯烃是在无溶剂条件下使用 DMAP (10% mol) 作为催化剂以优异的产率和 E 几何合成的。脂肪族、芳香族和杂环的各种醛与不同的活性亚甲基化合物顺利进行Knoevenagel缩合。#IICT 通讯编号 030900。
A Simple, Efficient and Green Procedure for Knoevenagel Condensation in Water or under Solvent-free Conditions
作者:Ya-Qin Yu、Zhong-Liang Wang
DOI:10.1002/jccs.201200391
日期:2013.3
1,4‐Diazabicyclo[2.2.2]octane was used as an efficient catalyst in the Knoevenagelcondensation reaction of various kinds of aromatic/aliphatic/heterocyclic/αβ‐unsaturated aldehydes and ketones with active methylene compounds. This is a convenient and rapid method for Knoevenagelcondensation, which affords the corresponding substituted electrophilic alkenes in excellent yields. The reaction condition
Sunscreen compositions are described which contain certain 5-phenylpentadienoate esters which act as UV filters when incorporated in a carrier in amounts ranging from 0.1-50% by weight.