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reaction: see text A rhenium complex, ReBr(CO)(3)(thf)(2), catalyzed the intermolecular reactions of 1,3-dicarbonyl compounds with terminal acetylenes and gave the corresponding alkenyl derivatives in excellent yields. These reactions could apply to an intramolecular version and gave the corresponding cyclic compounds quantitatively.
Kuninobu et al. (Fri,) studied this question.