potassium tert-butylate in tetrahydrofuran T=20°C; 4 h;

in diethyl ether byproducts: CF2CF(CH3)2COH; CF2CFLi: reaction of CH3Li and CF2CFBr; addition of CH3Li (at first) and CF3COCH3 to the bromide at -50 - -40°C and warming to 20°C within 3 hours;; 28 percent CF2CF(CH3)2COH;;

(i) nBuLi, (ii) /BRN= 1748614/; Multistep reaction;

phosphorus pentoxide

T=150°C;