Structural studies in main-group chemistry. Part IX. Crystal structure of chlorotrimethyl(triphenylphosphoranylideneacetone)tin(IV)

Abstract

The crystal structure of the title compound has been determined from X-ray diffractometer data by Patterson and Fourier methods. Crystals are monoclinic, space group P2₁/c with a= 9.303(2), b= 10.221 (2), c= 26.338(4)Å, β= 102.43(1)°, Z= 4. The tin atom possesses a trigonal bipyramidal configuration with the three methyl groups occupying equatorial positions [mean r(Sn–C) 2.133 Å] in a planar arrangement. The two axial sites are occupied by the chlorine atom [r(Sn–Cl) 2.56 Å] and the phosphorus ylide residue which functions as a unidentate oxygen-donor ligand [r(Sn–O) 2.332 Å]. The structural parameters of the ylide skeleton indicate strong electron-withdrawal from the P:C bond towards the acetyl group.