The crystal and molecular structure of 1,2-diphenyl-1,2-diphospholane-1,2-disulphide

The crystal and molecular structure of 1,2-diphenyl-1,2-diphospholane-1, 2-disulphide has been determined from three dimensional X-ray diffraction data

by Patterson and Fourier techniques. The structure has been refined by full matrix least squares methods to a final R value of 0.055 based on 1733 observed reflexions. The unit cell is orthorhombic, space group P2₁2₁2₁, with dimensions a = 13.867 Å, b = 12.379 Å and c = 9.312 Å (all ± 0.003 Å), and contains 4 molecules. The PP bond length of 2.253 ± 0.002 Å is similar to that in several diphosphine disulphides and phosphorus sulphides, and indicates the absence of any π bonding in the PP bond.