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.

Tetraalkyl cyclobutene-1,2,3,4-tetracarboxylates can be synthesized using a Wittig reaction between vinylphosphonium salt and diethyl 2-oxobutanedioate, leading to highly electron-deficient 1,3-

Paper

Stereoselective Synthesis of Tetraalkyl Cyclobutene-1,2,3,4-tetracarboxylates. Synthesis of Tetraalkyl (Z,Z)-Buta-1,3-diene-1,2,3,4-tetracarboxylates

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