Diphenylamine → Acetic Anhydride

Participants

Reaction Steps

Following a procedure similar to that described in Example 3 but employing 1.6 g. of an isomer mixture comprising 3-[4-(diethylamino)-2-methylbenzoyl]-4-pyridinecarboxylic acid and 4-[4-(diethylamino)-2-methylbenzoyl]-3-pyridinecarboxylic acid, 0.9 g. of diphenylamine and 6 ml. of acetic anhydride there was obtained an isomer mixture comprising 3-[4-(diethylamino)-2-methylphenyl]-3-(diphenylamino)furo[3,4-c]pyridine-1(3H)-one and 1-[4-(diethylamino)-2-methylphenyl]-1-(diphenylamino)furo[3,4-c]pyridine-3(1H)-one. A toluene solution of the product contacted with acidic clay or phenolic resin developed a red-grape image.

Provenance & Evidence