HCID 4736910, compound → 3,4-Dihydro-2H-naphtho[1,2-b]pyran-2-carboxylic acid

Participants

Reaction Steps

A mixture of 12 parts of 4-oxo-4H-naphtho[1,2-b]pyran-2-carboxylic acid and 100 parts of 2-methoxyethanol was hydrogenated at normal pressure and at room temperature with 2 parts of palladium-on-charcoal catalyst 10%. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated, yielding 7 parts (61.4%) of 3,4-dihydro-2H-naphtho[1,2-b]pyran-2-carboxylic acid as a residue (intermediate 19).

Provenance & Evidence