首页   按字顺浏览 期刊浏览 卷期浏览 The Chemistry of Stable Carbenes. Part 2. Benzoin‐type condensations of formaldehyde ca...
The Chemistry of Stable Carbenes. Part 2. Benzoin‐type condensations of formaldehyde catalyzed by stable carbenes

 

作者: J. Henrique Teles,   Johann‐Peter Melder,   Klaus Ebel,   Regina Schneider,   Eugen Gehrer,   Wolfgang Harder,   Stefan Brode,   Dieter Enders,   Klaus Breuer,   Gerhard Raabe,  

 

期刊: Helvetica Chimica Acta  （WILEY Available online 1996）
卷期: Volume 79, issue 1  

页码: 61-83

 

ISSN:0018-019X

 

年代: 1996

 

DOI:10.1002/hlca.19960790108

 

出版商: WILEY‐VCH Verlag GmbH

 

数据来源: WILEY

 

摘要:

AbstractStable carbenes derived from thiazole, 1H‐imidazole, and 4H‐1,2,4‐triazole are efficient catalysts for benzointype condensations of formaldehyde. Catalysts derived fromN‐substituted thiazolium salts trimerize formaldehyde to dihydroxyacetone (II). Catalysts based on 1,4‐disubstituted 4H‐1,2,4‐triazol‐1‐ium salts give glycolaldehyde (I) as the main product and noII, whereasN,N′‐disubstituted 1H‐imidazol‐3‐ium salts yield mixtures of both products. The isolation of several intermediates in the catalytic cycle provide a better insight

 

点击下载:  PDF (1396KB)



返 回