title: Cyclopropanation and carbonyl olefination utilizing 2-(Alk-1-yn-1-yl)-2-(trialkylsilyl)-1,3-dithianes via regioselective generation of titanium alkynylcarbene complexes.
abstract: Cp(2)Ti[P(OEt)(3)](2)-promoted reactions of 2-(alk-1-yn-1-yl)-2-(trialkylsilyl)-1,3-dithianes (RS)(2)C(Si)CCR with terminal olefins and carbonyl compounds produced (trialkylsilylethynyl)cyclopropanes and 1-(trialkylsilyl)alk-3-en-1-ynes, respectively. These compounds were suggest to be produced via the formation of intermediary titanium alpha-(trialkylsilylethynyl)carbene complexes Cp(2)Ti=C(R)CCSi in preference to their regioisomers, alpha-(trialkylsilyl)alkynylcarbene complexes Cp(2)Ti=C(Si)CCR.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan. takeda-t@cc.tuat.ac.jp
authors.forename: Takeshi
authors.initials: T
authors.lastname: Takeda
authors.forename: Makoto
authors.initials: M
authors.lastname: Ozaki
authors.forename: Shuichi
authors.initials: S
authors.lastname: Kuroi
authors.forename: Akira
authors.initials: A
authors.lastname: Tsubouchi