Abstract
New diazadiphosphetidines of the composition [MeSP(S)NR]2 have been investigated by 31P, 13C and 1H NMR spectroscopy and the configuration of the ring compound has been assigned. Structures of the 1,3-diphenyl compound 1g and the 1,3-di(ortho-tolyl) compound 1h have been determined by X-ray single-crystal analysis. Crystals of 1g and 1h grown from chloroform are colourless prisms of trans configuration. Single crystals of 1h obtained from dichloromethane are colourless plates of cis configuration. Crystal data: 1g (trans) monoclinic, C2/c, Z = 4, a = 9.373(2), b = 16.145(3), c = 11.705(2) Å, β = 92.11(3)°; 1h (trans) monoclinic, P21/n, Z = 2, a = 7.083(1), b = 18.275(4), c = 8.257(2) Å, β = 110.13(3)°; 1h (cis) monoclinic, P21/n, Z = 4, a = 9.994(2), b = 15.702(2), c = 13.668(5) Å, β = 105.14(2)°.
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