TRIS(MONOCHLOROPHENYL)PHOSPHINES AND TRIS(DICHLOROPHENYL)PHOSPHINES -MOLECULAR-GEOMETRY, ANODIC BEHAVIOR, AND ESR STUDIES

Tris(monochlorophenyl)phosphines 1-3 and tris(2,6-dichlorophenyl)phosp hine (4) were prepared. The X-ray structure of 4 was determined. Elect rochemical oxidation of 1-4 showed a good correlation between anodic p eak potentials and Hammett sigma(+) parameters in homologous series of substituted triarylphosphines. The ESR spectrum of radical-cation 4(. +) was composed of a large doublet with the highest known coupling con stant for triarylphosphoniumyl radicals (Ap = 366 G at -30 degrees C).