β-Alkoxycarbonylethyltin trichlorides were synthesized by using transesterifi-cation reaction of β-methoxycarbonylethyltin of β- butoxycarbonylethyltin trichloride with alcohols for the first time. Complexes of β-alkoxycarbonylethyltin trichlorides with neutral ligands such as 2, 2'-bipyrdey, 1, 10-phenanthroline, 4, 7-diphenyl- 1, 10-phenanthro-line wee prepared. Their structures were characterized by elemental analysis, milar conduct-ance, IR, UV, and ^1H NMR spectra. The intramolecular Lewis acid catalytic transesterification mechanisms of β-alkoxycarbonylethyltin trichiorides were suggested.

Key words: BIPYRIDINE, CATALYSIS, ALCOHOL, ORGANO TIN COMPOUNDS, REACTION MECHANISM, PROTON MAGNETIC RESONANCE SPECTROMETRY, EXCHANGE REACTION, INFRARED SPECTROPHOTOMETRY, ULTRAVIOLET SPECTROPHOTOMETRY