The lithium dialkylamide initially reacts as a strong base, abstracting a proton from the CHFz group, then as a nucleophile which adds readily on the fluorinated alkene 3. This attack occurs on the difluoromethylene group and yields the most stable anion 4. Carbanions 2 and 4 produce respectively the perfluoroalkene 3 and the fluorinated enamine 5, both by loss of F-. This enamine 5 may be isolated in aprotic media. For instance, C~ ...
