反应详情

A mixture 1.6 g of 3,4-dihydroxy-5-cyanobenzaldehyde, 2.0 g of 3,5-pentanedione, 0.2 ml of piperidine and 0.6 ml of acetic acid in 70 ml of toluene was refluxed for 2 h with Dean-Stark separator. The solvent was evaporated in vacuo and the residue was crystallized from acetone-cyclohexane. mp 228°-232° C.

1. customThe solvent was evaporated in vacuo
2. customthe residue was crystallized from acetone-cyclohexane