Reaktion #1243581

Reaktionsgleichung

3-Cyano-1-ethyl-4-methyl-5-[4-(N-ethyl-N-hydroxyethylamino)phenylimino]-pyridine-2,6-dione

water

hydrochloric acid

→

5-Cyano-1-ethyl-4-methylpyridine-2,3,6-trione

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeA pale yellow solid precipitates
2. 2
   Filtrationis filtered off
3. 3
   Sonstigerecrystallised from ethyl acetate/petrol, yield 0.32 g, m.p. 159°-160° C

Vorschrift

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).

Quelle