Liquid hydrogen sulphide as an ionising solvent. Part II. Reactions of Lewis acids of boron with base analogues

Abstract

Neutralisations of base analogues by volatile boron Lewis acids have been examined in liquid hydrogen sulphide. Salts containing the new anions BF₃SH^–, BCl₃SH^–, BBr₃SH^–, and BEt₃SH^– have been prepared. The reaction of diborane is more complicated but seems to proceed, at least initially, through the formation of the ion BH₃,SH·BH₃^–, which subsequently loses hydrogen. The ions BF₃SH^– and BCl₃SH^– react with excess of boron trihalide to give tetrafluoroborate and tetrachloroborate ions, respectively.