(2E, 4E)-Dienoic esters and (E,E)-α,β:γ,δ-dienones have been stereoselectively synthesized from 4-hydroxy-2-ynoic esters and γ-hydroxy-α,β-ynones by their reactions with triphenylphosphine under mild conditions.
C. Guo and X. Lu, J. Chem. Soc., Chem. Commun., 1993, 394 DOI: 10.1039/C39930000394
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