Polyfluoroalkyl derivatives of silicon. Part XIII. Preparation and pyrolysis of trifluoro(halogenovinyl)silanes and (1-fluoro-2-halogenoethyl)trihalogenosilanes
作者:Robert N. Haszeldine、Colin R. Pool、Anthony E. Tipping
DOI:10.1039/dt9750002177
日期:——
intermediacy of the alkylidenecarbene CH2:C:. Pyrolysis of (2-chloro-1-fluoroethyl)trifluorosilane gives vinyl chloride via a carbene intermediate, but the trichlorosilyl analogue yields the rearrangement compound dichloro(1,2-dichloroethyl)fluorosilane. 1,2-Difluoroethyl-trifluorosilane and -trichlorosilane both decompose via a non-carbene mechanism involving β elimination.
用喹啉处理1-氯-2-氟乙基-或1,2-二氯乙基-三氯硅烷得到三氯(1-氯乙烯基)硅烷。三氯(1,2-二溴乙基)硅烷类似地脱卤化氢。相反,在可比较的条件下2-氯-1-氟乙基-和1,2-二氟乙基-三氯硅烷得到氟乙烯。由三氯甲硅烷基类似物制得的1-氯乙烯基-和1-溴乙烯基-三氟硅烷都在280℃下缓慢分解,从而通过亚烷基卡宾CH 2:C:的中间体介导乙炔和四卤代硅烷。热解(2-氯-1-氟乙基)三氟硅烷赋予氯乙烯经由卡宾中间体,但是三氯甲硅烷基类似物产生重排化合物二氯(1,2-二氯乙基)氟硅烷。1,2-二氟乙基-三氟硅烷和-三氯硅烷均通过涉及β消除的非卡宾机理分解。