The HMPA promoted sequential transformations of diethyl ethoxycarbonyl phosphonate with potassium tert-butoxide, acrylonitrile and aldehydes affords 4-ethoxycarbonyl-(E)-γ,δ-unsaturated nitriles in 71–86% yields.
Y. Shen and Z. Zhang, J. Chem. Res. (S), 1999, 556 DOI: 10.1039/A902557J
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