A synthesis and isolation method for α-benzoin oxime was reported.With benzaldehyde as starting material and dicationic imidazolium salt as catalyst,α-benzoin as an important intermediate was synthesized through the mechanism of nitrogen heterocyclic carbine.This method is characterized by mild conditions,low cost,environment friendly and good yield.In the α-benzoin oximation reaction,adjusting the reaction temperature can get selective control of oxime structure for cis-trans isomers which were completely ...