Abstract
Intramolecular rearrangement due to successive 1,5-sigmatropic shifts of chlorine over a five-membered ring were found to occur in 5-chloro-1-alky1-2,3,4,5-tetramethoxycarbonylcyclopentadienes with energy barriers to chlorine migration falling in the range 26.0–27.3 kcal mol–1.
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