N,N-dimethylamino-1,1,2,2-tetrafluoroethane in tetrachloromethane T=0 - 5°C; 1 h;

diethylamino-sulfur trifluoride in diethylene glycol dimethyl ether T=-78 - -50°C;

lead(II) fluoride; NAF; sodium bromide T=90°C; 48 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

lead(II) fluoride; NAF; sodium bromide T=90°C; 72 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

lead(II) fluoride; sodium bromide in various solvent(s) T=90°C; 5 h; further reagent, solvent, allylic halides, time and temperatures; also with isomerization (3-bromo-1-butene); Product distributionMechanism;