Ring contraction of 3-bromothiochroman-4-one: Formation of a dimeric spirothioindoxyl and vinylenethioindigo

Add time:09/08/2019    Source:sciencedirect.com

Contrary to the literature, the reaction of 3-bromothiochroman-4-one with sodium acetate in acetic acid gives a dimeric spirothioindoxyl (whose crystal structure has been determined) which, after bromination and then heating in pyridine yields “vinylenethioindigo”.

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