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Abstract
Protonation of the reactive 1:1 intermediates produced in the reaction between triphenylphosphine and dialkyl acetylenedicarboxylates by 1,3-diphenylpropane-1,3-dione leads to vinylphosphoniurn salts, which undergo Michael addition with the conjugate base of the CH-acid to produce highly functionalized salt-free phosphorus ylides in excellent yields.