Hydrochloric Acid → HCID 19105283, compound

Participants

Reaction Steps

A mixture of ethyl 6-chloro-4-(3,4-dimethoxyphenyl)-2-oxo-2H-1-benzopyran-3-carboxylate (1.0 g), dioxane (5 ml), ethanol (5 ml) and 2N-NaOH (12 ml) was refluxed for 1.5 hours, and then, adjusted to pH 2 by adding 2N-HCl. The mixture was stirred for 30 minutes at room temperature, to which water was added to obtain 6-chloro-4-(3,4-dimethoxyphenyl)-2-oxo-2H-1-benzopyran-3-carboxylic acid as crystals. Recrystallization from acetone gave colorless prisms (0.54 g, 58.1%).

Provenance & Evidence