patent text with NMR and MS data: "[00767] 5-Formyl-2,4-dimethyl-1H-pyrrole-3-carboxylic acid ethyl ester (806 g), potassium hydroxide (548 g), water (2400...
yield) as as a brown powder. 1H-NMR (dimethylsulfoxide-d6) δ 3.46 (s, 2H, CH2), 6.75, 6.95, 7.05 (3×m, 3H, aromatic), 10.35 (s, 1H, NH). MS m/z 152 [M+1]. I...
solid was air dried to constant weight to give of 2,4-dimethyl-1H-pyrrole-3-carboxylic acid ethyl ester (1418 g, 87% yield) as a pinkish solid. 1H-NMR...
