High diastereoselectivity in beta-elimination reactions of O-acetyl 1,1-dihaloalkan-2-ols to give (Z)-vinyl halides was achieved by using samarium diiodide [Eq. (1)]. The reaction was also highly diastereoselective and totally chemoselective when a mixture of diastereoisomers was used as substrate (X(1), X(2)=halogen; X(1) not equal X(2)).
CAPORUSSO, A. M.;LARDICCI, L., J. CHEM. SOC. PERKIN TRANS., 1983, N 5, 949-953