反应详情

3-Benzyloxy-1-phenyl-1H-pyrazole-4-carbaldehyde (0.30 g), 5% palladium on carbon (0.50 g) and tetrahydrofuran (10 mL) were subjected to catalytic reduction under a hydrogen atmosphere and atmospheric pressure. The catalyst was filtered off and the filtrate was concentrated to give 3-hydroxy-1-phenyl-1H-pyrazole-4-carbaldehyde as colorless crystals (0.16 g, yield 76%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 196-197° C.

1. filtrationThe catalyst was filtered off
2. concentrationthe filtrate was concentrated