Tetraalkyl cyclobutene-1,2,3,4-tetracarboxylates, prepared by intramolecular Wittig reaction between a vinylphosphonium salt and diethyl 2-oxobutanedioate, undergo electrocyclic ring-opening reactions, in boiling toluene, to produce highly electron-deficient 1,3-dienes.
I. Yavari and F. Nourmohammadian, J. Chem. Res. (S), 1999, 512 DOI: 10.1039/A901432B
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