STEREOSELECTIVE SYNTHESIS OF UNSATURATED ORGANOTELLURIUM COMPOUNDS BASED ON TELLURIUM TETRACHLORIDE AND ACETYLENES
Effective regio- and stereoselective syntheses of unsaturated organotellurium compounds have been developed based on the reactions of tellurium tetrachloride and tetrabromide with phenylacetylene and diphenylacetylene. The conditions, which permitted the reaction of tellurium tetrabromide with phenylacetylene to be realized in a regio- and stereoselective manner, have been found. Thus, the reaction of tellurium tetrabromide with phenylacetylene (1:2 molar ratio of the reagents) in the mixture CCl4/benzene 1:9 under reflux led to Z,Z-bis (2-bromo-2-phenylvinyl)tellurium dibromide in 95 % yield. Z,Z-Bis(2-chloro-2-phenylvinyl)ditelluride and Z,Z-bis(2-bromo-2-phenylvinyl)ditelluride were obtained in 90–96 % yield by reduction of Z-2-chloro-2-phenylvinyltellurium trichloride and Z-2-bromo-2-phenylvinyltellurium tribromide. The obtained compounds are semi-products for organic synthesis and prospective reagents for microelectronics.