Surprising formation of chlorinated butenolides from dialkyl acetylenedicarboxylates and hexachloroacetone in the presence of triphenyl phosphite

[摘要]：Triphenyl phosphite reacts smoothly with dialkyl acetylenedicarboxylates and hexachloroacetone to produce alkyl 2-(dichloromethylene)-2,5-dihydro-5-oxo-4-(trichloromethyl)furan-3-carboxylates in good yields.

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