Potassium Hydroxide → 5-formyl-2,4-dimethyl-1H-pyrrole-3-carboxylic Acid

Participants

Reaction Conditions

Reaction Steps

Into a 10-L four necked round-bottomed flask equipped with a mechanical stirrer, a thermometer pocket, addition funnel and reflux condenser were charged 5-formyl-2,4-dimethyl-1H-pyrrole-3-carboxylic acid ethyl ester (IV) (0.6 Kg; 3.09 mole), methanol (2.0 L) and aqueous KOH solution (prepared by dissolving 450 g KOH in 1.8 L of water), stirred well and raised the reaction mass temperature to 60-70° C. and maintained for 4-6 hours. The progress of the reaction was monitored by TLC. After completion of the reaction, the excess solvent was removed under diminished pressure and the resulting product was diluted with water and extracted with ethylacetate. The aqueous layer was separated and the pH adjusted to 4.0 with conc. HCl. The resulting solution was stirred over night at 25-30° C. The product was filtered and washed with water. The product was dried at 60° C.

Provenance & Evidence