Hydrochloric Acid → HCID 19807613, compound

Participants

Reaction Steps

62.4 g (0.2 mol) of 3-chloro-4-(7-isopropyl-1,4-dimethyl-3-azulenyl)cyclobut-3-ene-1,2-dione were refluxed in 200 ml of dioxane, 40 ml of water and 2 ml of concentrated hydrochloric acid for 8 hours. The solvent was removed under reduced pressure, and the remaining oily residue was crystallized by adding dichloromethane. 36.5 g (62%) of 3-hydroxy-4-(7-isopropyl-1,4-dimethyl-3-azulenyl)cyclobut-3-ene-1,2-dione were obtained as dark brown crystals of melting point 120°-123° C. The substance was used without further purification for synthesizing dyes.

Provenance & Evidence