Abstract
Exposure of 2-alkynylphenylacetic acids to excess iodine in acetonitrile containing anhydrous potassium carbonate delivers good yields, either of the corresponding isochroman-3-ones or benzo[ d]oxepin-2(1 H)-ones, depending upon the alkyne substituent: when this is alkyl, the former 6- exo products dominate, otherwise the 7- endo products are formed largely or, more often, exclusively.
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