1,1-DIMETHYL-1-SILACYCLOHEXAN-4-ONE TOSYLHYDRAZONE

C14H22N2O2SSi, M(r) = 310.5, triclinic, P1BAR, a = 11.323 (2), b = 12.193 (2), c = 6.601 (5) angstrom, alpha = 81.00 (3), beta = 104.04 (3), gamma = 103.052 (12)degrees, V = 856 (1) angstrom3, Z = 2, D(x) = 1.204 cm-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 2.5 cm-1, F(000) = 332, T = 298 K, R = 0.045 for 2547 observed reflections. The silacyclohexylidene ring assumes the unusual twist-boat conformation. Calculations show the chair conformation to be more stable for both this silacyclic ring system as well as its corresponding carbocyclic analog. The packing motif, involving centrosymmetrically paired N-H...O hydrogen bonds, aromatic stacking and van der Waals contacts, apparently favors the less stable conformation of this ring.