Water → HCID 21504754, compound

Participants

Reaction Steps

1.0 gm (2 millimols) of 2-(n-butoxycarbonyl)-4-oxo-6,6-dimethyl-8-sulfo-12-chloro-4H,6H-[2]-benzopyrano-[3,4-f]-[1]-benzopyran (see Example 11) was heated for 1 hour in a mixture of 12 ml of acetic acid and 5 ml of concentrated hydrochloric acid. Then, the reaction mixture was evaporated to dryness, and the residue was recrystallized from methanol. 0.5 gm (53% of theory) of the compound named in the heading, m.p. 257°-259° C, was obtained (with 2 mols of water of crystallization).

Provenance & Evidence