Palladium complex catalyzed SiSi bond metathesis dimerization of 3,4-benzo-1,2-dimethyl-1,2-diethyl-1,2-disilacyclobut-3-ene and isomerization of the resulting and relevant dimers
作者:Yuko Uchimaru、Masato Tanaka
DOI:10.1016/0022-328x(96)06318-8
日期:1996.8
Palladium-phosphine complex catalyzed Si-Si bond metathesis dimerization of 3,4-benzo-1,2-dimethyl-1,2-diethyl-1,2-disilacyclobut-3-ene (1b) took place at 80 degrees C to give 3,4,7,8-dibenzo-1,2,5,6-tetramethyl-1,2,5,6-tetraethyl-1,2,5,6-tetrasilacycloocta-3,7-diene (2b) and its isomer 4,5,7,8-dibenzo-1,2,3,6-tetramethyl-1,2,3,6-tetraethyl-1,2,3,6-tetrasilacycloocta-4,7-diene (3b). Higher temperatures or longer reaction times enhanced the selectivity for 3b relative to 2b; indicative of concomitant isomerization of initially formed 2b to 3b. Isomerization of 3,4,7,8-dibenzo-1,1,2,2,5,5,6,6-octamethyl-1,2,5,6-tetrasilacycloocta-3,7-diene (2a), analogous to 2b, also proceeded at 80 degrees C in the presence of Pd(PPh(3))(4). Besides 4,5,7,8-dibenzo-1,1,2,2,3,3,6,6-octamethyl-1,2,3,6-tetrasilacycloocta-4,7-diene (3a), 4,5-benzo-1,1,2,3,3-pentamethyl-2-(o-trimethylsilylphenyl)-1,2,3-trisilacyclopentene (4a), 3,4,6,7-dibenzo-1,1,2,2,5,5-hexamethyl-1,2,5-trisilacycloheptadiene (5a) and 4,5-benzo-1,1,2,2,3,3,-hexamethyl-1,2,3-trisilacyclopentene (6a) were also formed. Mechanisms of the dimerization of 1b and isomerization of 2a and 2b are discussed.