Ethanol → HCID 4331501, compound

Participants

Reaction Steps

A mechanically-stirred mixture of 1,3-dioxo-1H-benz[de]isoquinoline-2(3H)-acetic acid (125.0 g, 0.49 mole), p-toluenesulfonic acid hydrate (9.3 g, 0.049 mole), anhydrous pure ethanol (226 g, 288 ml, 0.49 mole) and dry toluene (750 ml) was heated at reflux for 16 hr in a Soxhlet apparatus in which the thimble was filled with hydrated alkali-aluminium silicate (3 A Molecular Sieves). The title compound was crystallized from the reaction mixture after cooling to room temperature. The crystals were collected and a second crop of crystals were obtained from the mother liquors. Recrystallization of the two crops of crystals from ethyl acetate gave the title compound; mp 160°-162° C.; UV (MeOH) 232, 332 and 341 nm, ε=48,613, 13,470 and 12,920, respectively; IR (CHCl3) 1745, 1705 and 1665 cm-1 ; Anal. Calc'd.: C, 67.84%; H, 4.63%; N, 4.94%; Found: C, 67.89%; H, 4.60 %; N, 4.87%.

Provenance & Evidence