title: Reactions of a metallacyclobutene complex with alkenes.
abstract: The first productive reactions of a characterized metallacyclobutene complex with alkenes are reported. Thus, the metallacyclobutene complex (eta5-C5H5)(PPh3)Co[kappa2-(C,C)-C(SO2Ph) C(Si(CH3)3)CH(CO2CH2CH3)] (2) undergoes reaction with alkenes to give 1,4-diene complexes with a high degree of regio- and stereoselectivity. A mechanism is proposed in which the metallacyclobutene generates a cyclic vinylcarbene intermediate that undergoes [4 + 2]-cycloaddition reactions with activated alkenes. A model of the vinylcarbene intermediate has been examined using quantum mechanical methods.
authors.affiliation: Department of Chemistry, University of California, San Diego, La Jolla, California 92093, USA.
authors.forename: Ryan L
authors.initials: RL
authors.lastname: Holland
authors.forename: Kevin D
authors.initials: KD
authors.lastname: Bunker
authors.forename: Christopher H
authors.initials: CH
authors.lastname: Chen
authors.forename: Antonio G
authors.initials: AG
authors.lastname: DiPasquale
authors.forename: Arnold L
authors.initials: AL
authors.lastname: Rheingold
authors.forename: Kim K
authors.initials: KK
authors.lastname: Baldridge
authors.forename: Joseph M
authors.initials: JM
authors.lastname: O'Connor