Preparation of Other Sulphur Di-imides

Preparation of Other Sulphur Di-imides. Pyrolysis of A-sulphinylaniline has been found to give sulphur di-imides in the presence of a nickel(o) catalyst. Sulphur di-imides that have the general structure RN=S=NR (R = Me3Si, MejSn, or CgF,) 

Bernard, P. Tougain, and G. Robert,y4nn. Chim. Paris), 1979,4,591. 

Structure. Ultraviolet and mass-spectral analyses have been reported. Jf-Ray analyses of some N=S=N compounds have also been performed. In the compounds (26) and (27), both N=S=S and N=S=N groups form nearly coplanar configurations. The S=N bond lengths have been determined, and are shown. The S—N bond length of (27), Le. 1.592 A, is half-way between that of a double bond and that of a single bond, which that of S=S displays somewhat more double-bond character. 

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