Abstract: Ten di-n-butyltin(IV)carboxylates{[ⁿBu₂Sn(O₂CR)]₂O}₂(A1~A5)and ⁿBu₂Sn(O₂CR)₂(B1~B5)(R=1:CCl₃;2:CHCl₂;3:CH₂Cl;4:PhCH=CH;5:2,2,3,3-tetramethylcyclopropyl) were synthesized. Compounds A4、A5 and B5 are first re-ported. All compounds were characterized by elemental analysis, IR,¹H,¹³C and ¹¹⁹Sn NMR spectra. The spectral featurcs of ¹³C and ¹¹⁹Sn NMR spectra and the relation between δ(¹³C or ¹¹⁹Sn)valucs and PKa valucs of the parent acids were disscussed in detail. On this basis, the molecular structures of these compounds were inferred.

Key words: Di-n-butyltin (IV) carboxylates, ¹³C NMR, ¹¹⁹Sn NMR, PKa values, Molecu-lar structures