Thirty tributyltin carboxylates were synthesized using (Bu3Sn)2O as a precursor. The structures were studied by IR and NMR. The absorption frequencies of the carbonyl group markedly depended on the coordination no. of the tin atom. The chem. shifts of 119Sn and 13C and the 1J(119Sn-13Sn) coupling constants of the compounds were determine Small structural changes around the tin atom were reflected in the 119Sn chem. shifts. For tributyltin arylcarboxylates, a relationship between 119Sn chem. shifts and Hammett constants of the para-substituents was found. The biol. activities of same compounds have been studied. They may be used as fungicides for fruit.

Key words: INFRARED SPECTROPHOTOMETRY, NMR SPECTROMETRY, CARBOXYLIC ACID ESTER, STRUCTURAL ANALYSIS, TIN COMPOUND, HERBICIDES, BUTANE P, ANTIBIOTIC PROPERTY