title: Carbonyl Olefination by Means of a gem-Dichloride-Cp(2)Ti[P(OEt)(3)](2) System.
abstract: The preparation of highly substituted olefins by carbonyl olefination using a gem-dichloride-Cp(2)Ti[P(OEt)(3)](2) system was studied. The treatment of organotitanium species, formed by reaction with titanocene(II) species from gem-dichlorides having two alkyl substituents, with an aldehyde or ketone afforded tri- or tetrasubstituted olefins in good yields. Acyclic or cyclic trisubstituted vinyl ethers were also obtained by a similar reaction using carboxylic esters or lactones as carbonyl components.
authors.affiliation: Department of Applied Chemistry, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Takeda
authors.forename: Rika
authors.initials: R
authors.lastname: Sasaki
authors.forename: Tooru
authors.initials: T
authors.lastname: Fujiwara