Synthese 1,4-disubstituierter tetrasilane durch selektive spaltung von Si-phenyl-bindungen
摘要:
Just two of three Si-Ph bonds per silicon atom are cleaved by excess HBr under pressure. Thus. pentaphenyldisilane reacts with HBr at room temperature to give 1-phenyl-2,2,3,3-tetrabromodisilane. Subsequent coupling with bis-(t-butyl)-mercury yields 1.4-diphenyloctabromotetrasilane, which can also be obtained directly from 1,4-dichlorooctaphenyltetrasilane and HBr. Reduction ot 1.4-diphenyloctabromotetrasilane with LiAlH4 affords 1,4-diphenyltetrasilane, which can he converted to the corresponding 1,4-dihalo derivatives hy HCl or HBr.
Synthese 1,4-disubstituierter tetrasilane durch selektive spaltung von Si-phenyl-bindungen
摘要:
Just two of three Si-Ph bonds per silicon atom are cleaved by excess HBr under pressure. Thus. pentaphenyldisilane reacts with HBr at room temperature to give 1-phenyl-2,2,3,3-tetrabromodisilane. Subsequent coupling with bis-(t-butyl)-mercury yields 1.4-diphenyloctabromotetrasilane, which can also be obtained directly from 1,4-dichlorooctaphenyltetrasilane and HBr. Reduction ot 1.4-diphenyloctabromotetrasilane with LiAlH4 affords 1,4-diphenyltetrasilane, which can he converted to the corresponding 1,4-dihalo derivatives hy HCl or HBr.