Solvent dependence of products in the thermal decomposition of 4-methoxy-4,5-dihydro-3H-pyrazoles bearing two electronegative groups at C-3 was observed; nonpolar solvents gave predominantly alkenes, whereas polar solvents gave predominantly cyclopropanes.
M. Hamaguchi and T. Nagai, J. Chem. Soc., Chem. Commun., 1987, 1299 DOI: 10.1039/C39870001299
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