1: 1-hydrohexafluoroisobutenyl trimethylsilyl ether With cesium fluoride in diethylene glycol dimethyl ether T=-10°C; 2 h; 2: vinyl-dimethyl-chlorosilane in diethylene glycol dimethyl ether T=-10°C; 2 h; Further byproducts given;

magnesium in tetrahydrofuran byproducts: MgFCl; Schlenk technique, N2; mixt. (Mg excess) stirring for 72 h, THF vac. removal, residue extn. (Et2O), Et2O layer vac. evapn.; residue recrystn. (Et2O/n-hexane); elem. anal.;