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Abstract
The reaction of pentacarbonylmanganate anion 3 and 2-bromopropenoyl chlorides 2 leads to 2,4-alkylidenecyclobutane-1,3-diones 5. The latter are formed from dimerization of the corresponding methylene ketenes 1 so that the reaction of 2 and 3 constitutes a new synthetic procedure for the insitu generation of these very reactive intermediates. Acid chlorides 2 are readily available from α,β-unsaturated acids via bromination–dehydrobromination – thionyl chloride sequences.
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