Phthalaldehyde → HCID 1201585, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of o-phthalicdicarboxaldehyde (17.54 g, 0.131 mol) and p-carbethoxyphenylisocyanate (25.0 g, 0.131 mol) is heated in an oil bath at 170° C. for 4.0 hours under nitrogen atmosphere. The hot melt is then slowly poured into CHCl3 (300 ml). The solution is then evaporated to dryness when a solid residue is obtained. The crude 4-(1,3-dihydro-1-oxo-2H-isoindol-2-yl)benzoic acid, ethyl ester is triturated with isopropyl ether and then recrystallized from CH2Cl2 - isopropyl ether (1:1, 300 ml) to give white solid. Yield 5.07 g (13.8%); mp 182°-184° C.

Provenance & Evidence