Tetrahedron p. 5213 - 5221 (1990)
Update date:2022-08-10
Topics:
Bessard, Yves
Mueller, Ulrich
Schlosser, Manfred
By treatment with dibromodifluoromethane and triphenylphosphine, four unfunctionalized olefins, four enethers and one bis-enether were converted to the gem-difluorocyclopropanes 1-9. The yields were considerably increased and isomerizations at the double bonds were avoided if the reactions were carried out in the presence of a macrocyclic polyether such as "18-crown-6" and if, in addition, the reagents were employed in moderate excess.
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