Novel Ambiphilic Dichlorocarbenoid Equivalent in Alkene Cyclopropanation and Carbonyl Olefination
摘要:
The Ti-Mg-dichloromethylene complexes derived from the oxidative addition of CCl4 to the Mg-TiCl4 bimetallic species serve as a novel class of ambiphilic dichlorocarbenoid equivalents. Not only is Ti-Mg-dichlorocarbenoid highly selective but also it seems highly reactive in both alkene cyclopropanations and carbonyl dichloromethylenations.
Titanocene alkenylidene complexes, generated by the reductive metallation of 1,1-dichloro-1-alkenes with the titanocene(II) species Cp2Ti[P(OEt)3]2, reacted with alkynes to produce conjugateddienes.
通过将1,1-二氯-1-烯烃与钛茂(II)物种Cp 2 Ti [P(OEt)3 ] 2还原金属化生成的钛茂烯烯基络合物与炔烃反应生成共轭二烯。
Novel Ambiphilic Dichlorocarbenoid Equivalent in Alkene Cyclopropanation and Carbonyl Olefination
作者:Ching-Ting Chien、Chia-Chung Tsai、Chi-Hui Tsai、Tsai-Yuan Chang、Ping-Kuei Tsai、Ying-Chuan Wang、Tu-Hsin Yan
DOI:10.1021/jo052610t
日期:2006.5.1
The Ti-Mg-dichloromethylene complexes derived from the oxidative addition of CCl4 to the Mg-TiCl4 bimetallic species serve as a novel class of ambiphilic dichlorocarbenoid equivalents. Not only is Ti-Mg-dichlorocarbenoid highly selective but also it seems highly reactive in both alkene cyclopropanations and carbonyl dichloromethylenations.
Treatment of 1,1-dichloroalk-1-enes with Cp2Ti[P(OEt)3]2 produced organotitanium species, which afford allenes on treatment with aldehydes and ketones.