133744-89-5Relevant articles and documents
gem-Difluorocyclopropanes: An improved method for their preparation
Bessard, Yves,Mueller, Ulrich,Schlosser, Manfred
, p. 5213 - 5221 (1990)
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.