PHENYLLEAD(IV) DIORGANOPHOSPHINODITHIOATES, PH(N)PB(S(2)PR(2))(4-N) -SYNTHESIS, SPECTROSCOPIC CHARACTERIZATION, AND NMR-STUDY OF THE REDISTRIBUTION DECOMPOSITION OF DIPHENYLLEAD(IV) DERIVATIVES

Tri- and diphenyllead(IV) diorganophosphinodithioates, Ph(n)Pb(S(2)PR( 2))(4-n) (n = 2 and 3; R = Me, Et, Ph) were prepared by reacting the c orresponding organolead(IV) chloride with the sodium or ammonium salt of the phosphinodithioic acid. The title compounds were investigated b y infrared, H-1 and P-31 NMR, and mass spectroscopy, and possible stru ctures were proposed. The diphenyllead(IV) phosphinodithioates, Ph(2)P b(S(2)PR(2))(2), undergo decomposition on standing or on moderate heat ing, the least stable being the ethyl derivative. The process was moni tored by using H-1 and P-31 NMR spectroscopy, and a reaction pathway l eading to Ph(3)PbS(2)PR(2), Pb(S(2)PR(2))2, and R(2)P(S)SPh was establ ished.