Thermal isomerization of allenyl ether (1b) proceeds by intramolecular [2 + 2] cycloaddition to give (4), whereas the higher homologue (1c) is transformed by an alternate mode of [2 + 2] cycloaddition to the unstable alkene(7), which spontaneously dimerizes to (8) and (9); X-ray determinations confirm the structures of (8), (9), and lactone (6) derived from (4).
J. Dulcere and J. K. Crandall, J. Chem. Soc., Chem. Commun., 1990, 561 DOI: 10.1039/C39900000561
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