Abstract
Abstract An effective method for the synthesis of vinyl thioethers through the conjugate addition of ethanethiol to electron-deficient alkynes promoted by BF 3 ·Et 2 O has been developed. Electron-deficient internal alkynes react with ethanethiol in this system to yield mainly Z -isomer of vinyl thioether adducts, while electron-deficient terminal alkynes afford mainly E -isomer of vinyl thioether adducts.
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