Dipole moments of organophosphorus compounds. 16. Conformations of trimethylsilyl groups in some phosphites, phosphates, and phosphonates

Abstract

1. A study has been made of the dipole moments, Kerr constants, and IR spectra of silicon-containing phosphites, phosphates, and phosphonates. 2. The silicon-containing phosphates and phosphonates exist as equilibrium mixtures of various conformers, the predominant form being that in which the P=0 (S, Se) and (CH3)3SiO groups are in cis orientation. 3. The trimethylsilyl group preferentially occupies a gauche position with respect to the unshared electron pair of the phosphorus atom in compounds containing phosphorus in three-coordination. © 1978 Plenum Publishing Corporation.