Selenolactonization of alkynoic acids with N-phenylselenophthalimide: novel isomerization reaction of a vinyl selenide

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Abstract
Selenolactonization is stereoselective and regiospecific for hex-4-ynoic and hept-4-ynoic acids (1a) and (1b), but pent-4-ynoic acid (1c) gives a mixture of stereoisomers.