Synthesis of Sterically Hindered Ortho-Substituted Tetraphenylethenes. Electronic Effects in the McMurry Olefination Reaction
作者:Mee-Kyung Chung、Guizhong Qi、Jeffrey M. Stryker
DOI:10.1021/ol060318h
日期:2006.3.1
[reaction: see text] Contrary to literature consensus, the McMurry olefination reaction can be extended to the direct synthesis of sterically encumbered tetrakis(2-substituted) tetraphenylethenes from the corresponding 2,2'-disubstituted benzophenones. The reaction exploits previously unrecognized substrate-based electronic effects that dominate over otherwise controlling steric considerations and
[反应:参见正文]与文献共识相反,McMurry烯烃化反应可扩展为由相应的2,2'-二取代的二苯甲酮直接合成空间受限的四(2-取代)四苯基乙烯。该反应利用了以前无法识别的基于底物的电子效应,该效应在控制空间方面的考虑方面占主导地位,并提供对四(2-羟苯基)乙烯衍生物的高效访问,该衍生物是一种用于多金属配位化学和催化的新型预组织配体系统。