Steric and electronic effects on the Weiss reaction. Isolation of 1∶1 adducts
作者:Scott G. Van Ornum、Jin Li、Greg G. Kubiak、James M. Cook
DOI:10.1039/a701232b
日期:——
with benzil, pyridil, thenil, furil and phenanthrenequinone, steric effects play the major role in the overall success of this condensation to provide substituted cis-bicyclo[3.3.0]octane-3,7-diones. Moreover a trihydroxyindene [5.6] system (see 26) has been isolated for the first time under the Weiss conditions which provides additional support for the existence of cyclopentenone intermediates in this
关于该过程中4-羟基环戊-2-烯-1-酮(1:1加合物)的中间体,研究了魏斯反应的机理。对这些实验的分析提供了另外的证据,表明4-羟基环戊烯酮确实是Weiss反应中的关键中间体。基于3-氧代戊二酸二甲酯与苯甲酰,吡啶,丁腈,糠醛和菲醌的反应,空间效应在该缩合反应的整体成功中起着主要作用,可提供取代的顺式-双环[3.3.0]辛烷-3,7- diones。此外,在Weiss条件下首次分离了三羟基茚[5.6]系统(参见26),这为该过程中环戊烯酮中间体的存在提供了额外的支持。