Hydrochloric Acid → HCID 20536091, compound

Participants

Reaction Steps

1.02 g of 3-Cyano-1-ethyl-4-methyl-5-[4-(N-ethyl-N-hydroxyethylamino)phenylimino]-pyridine-2,6-dione (prepared as described in German Offenlegungsschrift No. 2808825) is stirred in 7 ml of water, and concentrated hydrochloric acid is slowly added until the blue dye had disappeared. A pale yellow solid precipitates, and is filtered off and recrystallised from ethyl acetate/petrol, yield 0.32 g, m.p. 159°-160° C. This is the compound of formula (4).

Provenance & Evidence