The addition of N-methyl-2-pyrrolidone as solvent in the oxy–Cope rearrangement of (3) and (4) increases the yield, and affects the stereoselectivity of the products.
Y. Fujita, T. Onishi and T. Nishida, J. Chem. Soc., Chem. Commun., 1978, 972 DOI: 10.1039/C39780000972
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