Add time:09/30/2019 Source:sciencedirect.com
2-Halobenzyl 1-alkynyl sulfides undergo an unprecedented dihydrothiophene formation when treated with 2 equiv. of KOtBu in CH3CN. The reaction, believed to proceed via a 5-endo-dig cyclization, is sluggish or non-existent in the absence of the halogen.
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