Pentasulphur Triimides : Completion of a Class of Cyclic Sulphur Imides

Abstract

AMONG the compounds theoretically obtainable by replacing sulphur atoms in the octasulphur ring by imino groups, heptasulphur imide and tetrasulphur tetraimide have long been known. Last year the 1–3, 1–4 and 1–5 isomers of hexasulphur diimide were reported independently by Tavs, Schultze-Steinen and Colchester¹, and by one of us², and we have since confirmed the structures proposed in the latter reference by measurement of dipole moments³. Excluding compounds with adjacent imino groups, none of which is known, there remained to be made only two sulphur imides derived from octasulphur in its normal ‘crown’ conformation, namely, the 1–3–5 and 1–4–6 isomers of pentasulphur triimide. We now report the preparation of two compounds which we think are these.