Cl[C:2]([F:6])=[C:3]([F:5])[F:4].C([Li])CCC.Cl[Si:13]([CH3:16])([CH3:15])[CH3:14]>>[F:4][C:3]([F:5])=[C:2]([F:6])[Si:13]([CH3:16])([CH3:15])[CH3:14]Chlorotrifluoroethylene of the formula (10) is treated with n-butyl lithium and then reacted with chlorotrimethylsilane of the formula (11) to obtain 1,1,2-trifluoro-2-trimethylsilylethylene of the formula (12). Then, without isolation, this compound (12) is reacted further with a lithium compound of the formula (13) to obtain a difluoroethylene compound of the formula (14).
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