UEBER ZINN-HALTIGE HETEROCYCLEN. V. Sn-PHENYL-SUBSTITUIERTE STANNOCANE, UEBERGAENGE VON TETRAEDRISCHER 4-ZU TRIGONAL-BIPYRAMIDALER 5-KOORDINATION

Article abstract of DOI:10.1016/S0022-328X(00)81913-0

A complete series of diphenyl and mixed methyl/chlorine/bromine/iodinephenyl substituted oxadithia- and trithiastannocanes has been prepared by reactions between the respective disodium dithiolates and tin dihalides.The 13C NMR chemical shifts of these compounds and the coupling constants J(119Sn-13C) are dependent upon the magnetic anisotropy of the substituents and the bond angles at the tin atom.The crystal structure of 2,2-diphenyl-1,3,6-trithia-2-stannocane has been determined and refined to R=0.039.The environment of Sn is a monocapped tetrahedron (transannular distance Sn...S 324.6(1) pm).This type of coordination, intermediate between a tetrahedron and a trigonal bipyramid, is discussed quantitatively and compared with a series of analogous compounds.The eight-membered ring has the boat-chair conformation.