Synthesis of methyliminosulphur difluoride and bis(methylimino)sulphur by the reaction of pentafluorosulphur chloride or sulphur tetrafluoride with methylamines

Abstract

Pentafluorosulphur chloride, SF₅Cl, reacts with trimethylamine at –78° to give SF₅Cl,(NMe₃)₂. This compound decomposes quantitatively at room temperature to yield sulphur tetrafluoride and (Me₃N)₂CIF. Methyliminosulphur difluoride, CH₃NSF₂, has been synthesised by the reaction of methylamine with either pentafluorosulphur chloride or, preferably, sulphur tetrafluoride. Bis(methylimino)sulphur, (CH₃N)₂S has been synthesised by the reaction of methylamine with either a deficit of sulphur tetrafluoride or with methyliminosulphur difluoride. Certain physical and chemical properties of these new compounds have been studied.