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The reactivity of alkynylenolate was investigated in the reactions of allenic ketones and vinyl ketones. We found that different products could be obtained under different conditions. The tetrabutylammonium fluoride (TBAF)‐mediated Michael addition of allenic ketones to vinyl ketones gave 2‐alkynyl 1,5‐diketones as the product. Under stronger basic conditions, a tandem Michael addition/aldol reaction...
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