Stereoselective conjugate addition of halide anion to acetylenic carbonyl compounds promoted by lanthanoid reagents
The conjugate addition of halide anion to acetylenic ketones proceeded by the combined use of cerium salts, halotrimethylsilanes and sodium or tetrabutylammonium salts to afford trans-β-halo enones stereoselectively. On the other hand, N,N-diethyl cis-β-haloacrylamides were synthesized from propiolamide.