title: Palladium-catalyzed ring enlargement of aryl-substituted methylenecyclopropanes to cyclobutenes.
abstract: Methylenecyclopropanes 1 could be converted to the corresponding cyclobutenes 2 under the catalysis of palladium acetate in the presence of metal bromide in 1,2-dichloroethane under mild conditions. A plausible reaction mechanism has been proposed on the basis of deuterium labeling experiment.
authors.affiliation: State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China. mshi@pub.sioc.ac.cn
authors.forename: Min
authors.initials: M
authors.lastname: Shi
authors.forename: Le-Ping
authors.initials: LP
authors.lastname: Liu
authors.forename: Jie
authors.initials: J
authors.lastname: Tang