Hydrochloric Acid → 1-(4'-Methoxyphenyl)-1,4-dihydro-indeno[1,2-c] pyrazole

Participants

Reaction Steps

2-Hydroxymethylene inden-l-one (Example 1(ii) (a) (4.0 g; 25 mmol), p-methoxyphenyl hydrazine hydrochloride (Aldrich) (4.41 g; 25.25 mmol), 10 M hydrochloric acid (1 cm3) and ethanol (30 cm3), were heated under reflux, for 21 hours. After cooling, the mixture was concentrated in vacuo and the residue dissolved in dichloromethane, then washed with 2M NaOH, dried, filtered and concentrated in vacuo. Purification by column chromatography [Eluant: (dichloromethane: ethanol: ammonia (200:8:1)] Kugelrohr distillation (170° C.; 0.02 mmHg) and recrystallisation (ethanol) afforded needle shaped crystals, m.p. 102-103° C.

Provenance & Evidence