1-Chloro-2,6-dinitrobenzene → 4-(2,6-Dinitrobenzylidene)-1-ethyl-1,4-dihydroquinoline

Participants

Reaction Steps

1-Ethyllepidinium iodide (3.0 g., 10 mmole) and 1-chloro-2,6-dinitrobenzene (2.5 g., 12 mmole) are warmed in acetonitrile (50 ml.) and diisopropylethylamine (2.6 g., 20 mmole) is added. The resulting dark mixture is aligned to cool and stand overnight. The precipitate of dye is filtered off and washed with acetonitrile and ether. On recrystallization from acetonitrile, 25% yield (0.85 g.) of purified dye is obtained with a m.p. of 45°-155° C. dec.

Provenance & Evidence