反应详情

1-Methyl-1-phenylhydrazine (21.6 g) was added to a suspension of 2,4-piperidinedione (20.0 g) in industrial methylated spirit (100 ml) at 20°-25° under nitrogen. The resultant solution was stirred for 3 h at room temperature. Water (300 ml) was added and the resulting suspension was filtered to give the title compound (34.4 g) as a solid, m.p. 180.5°-182°.

1. filtrationthe resulting suspension was filtered