反应详情

5-Ethyl-2-methyl-1-propylpyridinium bromide (8.1 g, 0.033 mole) and 4-dimethylaminobenzaldehyde (6.0 g, 0.04 mole) were refluxed in methanol (50 ml) in the presence of piperidine (1.5 ml) under nitrogen for four hours. Ether was added to the cool solution and, on scratching, a red solid crystallised which was collected and washed with a little isopropanol to give 2-[4-(dimethylamino)-styryl]-5-ethyl-1-propylpyridinium bromide (7.7 g). Melting point 236°-237° (decomposition).

1. customa red solid crystallised which
2. customwas collected
3. washwashed with a little isopropanol