Diels–Alder reactions. Part II. Condensation of methyl trans-β-formyl-crotonate with dienols and their acetates

Abstract
Methyl trans-β-formylcrotonate gave Diels–Alder adducts with 3-methylpenta-trans-2,4-dien-1-ol and 3-methyl-penta-trans-2,4-dienyl acetate. The structures of the adducts were determined by their conversion into the corresponding γ-and δ-lactones. A novel rearrangement of a trans-γ-lactone to a cis-γ-lactone is described.

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