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The phosphino-substituted sulfur diimides S(N-P t Bu 2 ) 2  (1),  t Bu;P(NSN)PRR′ (R = R′ - phenyl (2a), cyclohexyl (2b), isopropyl (2c), ethyl (2d); R = phenyl, R′ = tert-butyl (2e)) and  t Bu 2 P(NSN) t Bu (3) were studied in solution by  1 H,  13 C and  31 P NMR spectroscopy**. The coupling constants  4 J( 31 P 31 P) of the compounds containing different phosphino groups, 2a-e, depend both on the nature of the solvent and the temperature. The NMR results are interpreted in accord with a rapid Z/E⇄ E/Z interconversion at room temperature and the predominance of a single configurational isomer at low temperatures. There is no indication for the presence of the “symmetrical” configurations, Z/Z or E/E respectively, in solution in appreciable amounts.  15 N NMR data are also reported for a series of sulfur diimides.

zeitschrift für naturforschung b

Unsymmetrisch substituierte Phosphinoschwefeldiimide – NMR-Untersuchungen über die Konfiguration in Lösung/ Unsymmetrically Substituted Phosphino Sulfur Diimides – NMR Studies on the Configuration in Solution