1: 3-(fluorophenyloxy)triisopropylsilane With N,N,N',N'',N''-pentamethyldiethylenetriamine; sec.-butyllithium in tetrahydrofuran T=-75°C; 2 h; 2: carbon dioxide in tetrahydrofuran

1: 3-(fluorophenyloxy)triisopropylsilane With potassium tert-butylate in tetrahydrofuran T=-75°C; 2 h; 2: carbon dioxide in tetrahydrofuran

1: 3-(fluorophenyloxy)triisopropylsilane With N,N,N',N'',N''-pentamethyldiethylenetriamine; sec.-butyllithium in tetrahydrofuran T=-75°C; 2 h; 2: carbon dioxide in tetrahydrofuran