Reactivity of some di- and triphenyltin(IV) hydroxamates with ligands containing labile protons

Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla-171 005, India Manuscript received 18 December 1998, revised 22 June 1999, accepted 29 June 1999 The reactivity of di- and triphenyltin(IV) hydroxamate complexes of composition (C6H5)2SnCl2-n(XBHA)n and (C6H5)3Sn(XBHA) (n = 1 and 2; X = p-OMe, o-Cl, p-NO2; BHA = anion of XArCONHOK) with ligands containing labile protons such as acetylacetone (acacll), dibenzoylmethane (dbmH), salicylaldehyde (salH) and o-chlorophenol and thiophenol has been studied to investigate the preferential attack on Sn-C, Sn-CI or Sn-O bond. The title complexes do not react with the chelating ligands. However, the reactions of (C6H5)2SnCI(XBHA) with sodium salt of the chelating ligands NaL (L = acac, dbm and sal) readily proceed to yield the mixed ligand complexes of composition (C6H5)2Sn(XBHA).L, while the treatment of (C6H5)2Sn(XBHA)2 and (C6H5)3Sn(XBHA) with phenols results in the complete displacement of the hydroxamate group with the phenolate ion.