Nine triphenyltin-2-(1, 2-ethylenedithio) methylene-3-oxo-5-aryl-4- pentenicates were synthesized. The crystal structure of the title compound 3b(C~3~3H~2~8O~3S~2Sn) was determined by X-ray diffraction analysis. The crystal belongs to triclinic system, space group P1 with a=0.9074(2)nm, b=1.6809(3)nm, c=2.1834(4)nm, α=77.57(3)ⅲ, β =88.04(3)ⅲ, γ=89.47(3)ⅲ, V=3.2503nm^3, Z=2; R=0.0592. In crystal of 3b, there exist intramolecular O-Sn coordination bonds, with carboxylate group acting as a bidentate ligand: Sn(1)-O(1)=0.2086(5) and Sn(1)-O(2)=0.2594nm, having a deformed trigonal bipyramidal geometry.

Key words: ORGANO TIN COMPOUNDS, PENTENOIC ACID P, CRYSTAL STRUCTURE, X-RAY DIFFRACTION ANALYSIS, INSECTICIDES