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A direct and short route to the synthesis of 4‐aryloxymethyl‐δ3 ‐chromenes and 3‐(β‐aryloxy)‐ethylbenzofurans is described. Hydration of I,4‐diaryloxy‐2‐butynes with mercuric oxide and sulfuric acid affords, instead of a ketone, the cyclization product of the ketone. In three of the diaryloxy‐butynes studied, the corresponding aryloxyethylbenzofurans are formed. In no instance could the ketone be isolated from the hydration reaction.
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Majumdar et al. (1972) studied this question.
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