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DOI: 10.1039/A708460I (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 1645-1652

Synthesis and structures of new mono- and multi-nuclear benzyltin carboxylates and phosphinates: a novel dibenzyltin phosphinate stabilized by intramolecular hydrogen bonding

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K. C. Kumara Swamy, Musa A. Said, S. Nagabrahmanandachari, Damodara M. Poojary and Abraham Clearfield

Abstract

The reaction of dibenzyltin dichloride 1 with 2 mol equivalents each of AgO2P(C6H11)2 and (C6H11)2PO2H afforded the novel monometallic complex 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]}3O][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 acid used. Thus the ‘ladder’ {[(PhCH2)SnO·O2CMe]2(PhCH2)Sn(O2CMe)3}2 5, the ‘hexagonal prismanes’ [(PhCH2)SnO·O2CR]6 (R = Me 6, But 7, C5H4N 8, CH[double bond, length half m-dash]CMe2 9 or CHPh2 10) and the mononuclear compound Sn(CH2Ph)2(O2CCHPh2)2 11 have been isolated. X-Ray structural analysis confirmed the identities of 2, 4·CHCl3, and 5·2CH2Cl2. In 2 the mononuclear structure is stabilized by internal hydrogen bonding between P–OH and P[double bond, length half m-dash]O of the co-ordinated phosphinic acid and the phosphinate, respectively, from the same molecule. Compound 4 has a tristannoxane ring with a capping oxygen, whereas in 5 the stannoxane skeleton is that of a ‘ladder’ with three different types of tin.

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