Reaction of CH2Br2 with CBr2F2 and alkenes 1a–e in the presence of 60% aqueous KOH and tetrabutylammonium hydrogensulphate as a catalyst affords gem-difluorocyclopropanes 2a–e.
P. Bałcerzak, M. Fedoryński and A. Jończyk, J. Chem. Soc., Chem. Commun., 1991, 826 DOI: 10.1039/C39910000826
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