title: Nickel-catalyzed intermolecular [2 + 2] cycloaddition of conjugated enynes with alkenes.
abstract: A nickel-catalyzed intermolecular [2 + 2] cycloaddition of conjugated enynes with alkenes has been developed. A variety of electron-deficient alkenes as well as electronically neutral norbornene and 1-decene were applicable to this reaction. The use of conjugated enynes circumvented possible side rections, such as oligomerizations and cyclotrimerizations. The isolation of reaction intermediate complexes revealed that the η(3)-butadienyl coordination is the key for the selective formation of cyclobutene.
authors.affiliation: Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Nishimura
authors.forename: Masato
authors.initials: M
authors.lastname: Ohashi
authors.forename: Sensuke
authors.initials: S
authors.lastname: Ogoshi