SYNTHESIS AND STRUCTURES OF NEW MONO- AND MULTINUCLEAR BENZYLTIN CARBOXYLATES AND PHOSPHINATES - A NOVEL DIBENZYLTIN PHOSPHINATE STABILIZEDBY INTRAMOLECULAR HYDROGEN-BONDING

The reaction of dibenzyltin dichloride 1 with 2 mol equivalents each o f AgO2P(C6H11)(2) and (C6H11)(2)PO2H afforded the novel monometallic c omplex Sn(CH2Ph)(2)[O2P(C6H11)(2)](2)[HO2P(C6H11)(2)](2) 2. When 1 was treated with 2 mol equivalents of AgO2P(C6H11)(2) only the trinuclear O-capped cluster Sn(CH2Ph)(OH)[O2P(C6H11)(2)]}(3)O]-[O2P(C6H11)(2)] 4 was obtained by an Sn-C bond cleavage via an intermediate formulated as {Sn(CH2Ph)(OH)[O2P(C6H11)(2)](2)}(2) 3. In the reaction with silver carboxylates the type of product isolated depends on the carboxylic a cid used. Thus the 'ladder' {[(PhCH2)SnO.O2CMe](2)(PhCH2)Sn(O2CMe)(3)} (2) 5, the 'hexagonal prismanes' [(PhCH2)SnO.O2CR](6) (R = Me 6, Bu-t 7, C5H4N 8, CH=CMe2 9 or CHPh2 10) and the mononuclear compound Sn(CH2 Ph)(2)(O2CCHPh2)(2) 11 have been isolated. X-Ray structural analysis c onfirmed the identities of 2, 4.CHCl3, and 5.2CH(2)Cl(2). In 2 the mon onuclear structure is stabilized by internal hydrogen bonding between P-OH and P=O of the co-ordinated phosphinic acid and the phosphinate, respectively, from the same molecule. Compound 4 has a tristannoxane r ing with a capping oxygen, whereas in 5 the stannoxane skeleton is tha t of a 'ladder' with three different types of tin.