Palladium-catalyzed ring enlargement of aryl-substituted methylenecyclopropanes to cyclobutenes.
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.
Shi
Min
M
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
Liu
Le-Ping
LP
Tang
Jie
J