3-Phenylsulfonylpropyltrimethylammonium chloride and 3-cyanopropyltrimethylammonium
chloride react with aromatic aldehydes in the presence of excess
of potassium tert-butoxide and methyl
iodide to give 1,2-disubstituted 1,3-butadienes.
aldehydes - butadienes - carbanions - Hofmann
elimination - quaternary ammonium