Phosphoric Acid → N-Phenylmaleimide

Participants

Reaction Conditions

Reaction Steps

The slurry containing the N-phenyl maleinamic acid and 10 g of ortho-phosphoric acid added thereto were heated at 210° C. for three hours. The resultant reaction mixture was cooled to 30° C., washed with water, and distilled under a vacuum to expel tetrahydronaphthalene and obtain 78 g of N-phenyl maleimide crystals. By liquid chromatography, the crystals were found to have purity of 87.3% by weight, indicating the yield thereof to be 73.2 mol %.

Provenance & Evidence