Stereoselective synthesis of E-2-halovinyl tellanes, ditellanes and selenides based on tellurium tetrahalides, selenium dihalides and internal alkynes

Add time:09/05/2019    Source:sciencedirect.com

The reactions of selenium dihalides, tellurium tetrachloride and tetrabromide with 3-hexyne and 4-octyne proceed in a stereoselective manner as anti-addition to afford products of E-stereochemistry. First examples of bis-adduct synthesis from tellurium tetrachloride and disubstituted acetylenes as well as of the addition of tellurium tetrabromide to disubstituted acetylenes were described. Reaction conditions for efficient stereoselective synthesis of E-2-halovinyl tellanes, ditellanes and selenides were developed.

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