F. Wang, W. Zhang, J. Zhu, H. Li, K.-W. Huang, J. Hu
Chem. Commun., 47, pp. 2411-2413, (2010)
A chloride ion-catalyzed generation of difluorocarbene from a relatively non-toxic and inexpensive precursor, Me3SiCF2Cl (1), under mild and neutral conditions leads to an efficient preparation of gem-difluorocyclopropenes and difluorocyclopropanes through [2 + 1] cycloaddition reactions with alkynes and alkenes, respectively.