Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... (E)-vic-Difluoro olefin, RCFCFBr, was synthesized by dehydrobromination of RCFHCFBr 2 using lithium 2,2,6,6-tetramethylpiperidide. (E)-Fluoro olefin, RCHCFBr, was obtained by treatment of RCH(OAc)CFBr 2 with EtMgBr and HN(i-Pr) 2 . ... (E)-vic-Difluoro olefin, RCFCFBr, ...