Sn2 reactions of alkenes bearing a trifluoromethyl group

2-Trifluoropropenylsilane (5) reacts with a variety of nucleophiles to give 1,1-difluoro-2-silylalkenes (6) via an Sn2 reaction, which can be transformed to 1,1-difluoroalkenes 

An electron is a tiny and powerful nucleophile that is easily accepted into a CF3 -bearing tt-system because of the low-lying LUMO. Either electrochemical reduction [9 ] or magnesium metal reduction [10] is useful for the C—F bond activation via the formal supply of one 

---