The olefination of ketones using the organotitanium species formed from Cp2Ti[P(OEt)(3)](2) and polychloromethane was studied. The reaction of the organotitanium species prepared from carbon tetrachloride with ketones produced the 1,1-dichloro-1-alkenes in good yields even when dialkyl ketones were employed. The similar olefination of ketones using chloroform afforded the 1-chloro-1-alkenes and 1,1-dichloro-1-alkenes, the ratio of which reflected the steric demand on the ketones. The titanocene chloromethylidene complex was suggested to be an active species of the reaction on the basis of the results obtained by the reaction using chloroform-d. (C) 1999 Elsevier Science Ltd. All rights reserved.
JPS58126829A
申请人:——
公开号:JPS58126829A
公开(公告)日:1983-07-28
Preparation of 1-Bromo-1-chloro-, 1,1-Dibromo- or 1,1-Dichloroalk-1-enes from Ketones
作者:Hadi Rezaei、Jean F. Normant
DOI:10.1055/s-2000-6225
日期:——
An efficient three steps process for converting aliphatic ketones to the homologous gem-bromochloro, or gem-dibromo alkenes is presented.