ON THE SYNTHESIS AND STRUCTURE OF MONOARYLLEAD AND DIARYLLEAD ACETATES RPB(OCOCH3)(3) AND R2PB(OCOCH3)(2)

Anhydrous monoaryllead triacetates ArPb(OAc)(3) (Ar = Ph, p-Tolyl, o-T olyl, 2,5-Xplyl; OAc = OCOMe) were prepared by arylation of Pb(OAc)(4) with ArSn(C4H9-n)(3) in the presence of Hg(OCOCF3)(2). The procedure was adapted for the synthesis of diaryllead diacetates Ar2Pb(OAc)(2) ( hr = Ph, p-Tolyl, o-Tolyl, p-ClC6H4, o-ClC6H4) and afforded products w ith higher purity than other procedures. The crystal structures of PhP b(OAc)(3), Ph2Pb(OAc)(2) and (o-Tolyl)(2)Pb(OAc)(2) were determined by X-ray diffraction. PhPb(OAc)(3) and (o-Tolyl)(2)Pb(OAc)(2) are monome ric. The pentagonal bipyramid around Pb in PhPb(OAc)(3), like the trap ezoidal bipyramid around Ph in (o-Tolyl)(2)Pb(OAc)(2), is heavily dist orted, the OAc groups being unsymmetrically chelating. Lead in Ph2Pb(O Ac)(2) is in a distorted octahedral environment. One OAc group is brid ging, linking the molecular units to infinite chains, the other OAc gr oup is symmetrically chelating. IR,H-1,C-13 and (207)pb NMR spectrosco pic data an reported. The structures of p-TolPb(OAc)(3), o-TolPb(OAc)( 3) and 2,5-XylPb(OAc)(3) are inferred to be similar to that of PhPb(OA c)(3), and the structure of (o-ClC6H4)(2)Pb(OAc)(2) is inferred to be similar to that of (o-Tolyl)(2)Pb(OAc)(2).