Chromocarb → 3,4-dihydro-2H-1-benzopyran-2-carboxylic acid

Participants

Reaction Steps

To a suspension of commercially available chromone-2-carboxylic acid (50 g, 281 mmol) in methanol (500 mL), slurry of (10% Pd/C wet, 5 g) in water (10 mL) was added under nitrogen atmosphere. The mixture was hydrogenated at 60 psi at room temperature (RT) and further maintained hydrogen reservoir up to 60 psi for 2 h. The progress of reaction was monitored by TLC. Reaction mixture was filtered through celite and the filtrate was concentrated under reduced pressure to yield chromane-2-carboxylic acid as off-white solid (44.7 g, 95%). m/z-178.02.

Provenance & Evidence