beta -Methylselenenyl alpha,beta -unsaturated ketones were effectively synt
hesized by treating selenoamides with methyl triflate, followed by reaction
with lithium acetylides, The reaction proceeded with high stereoselectivit
y to give exclusively Z-isomers, Se-77 NMR studies and X-ray molecular stru
cture analysis of beta -methylselenenyl alpha,beta -unsaturated ketones sug
gested that the products show 1,5-nonbonding interaction between the seleni
um atom and carbonyl oxygen atom.