反应详情

1-Hexyl-2-methylpyridinium bromide (7.8 g, 0.03 mole) and 4-dimethylaminobenzaldehyde (6.0 g, 0.04 mole) were refluxed in methanol (50 ml) in the presence of piperidine (1.0 ml) under nitrogen for four hours. On cooling and the addition of about 100 ml of ether a solid crystallised which was collected and washed with a little isopropanol to give 2-[4-(dimethylamino)styryl]-1-hexylpyridinium bromide (6.3 g), melting point 217°-218° (decomposition).

1. temperatureOn cooling
2. customcrystallised which
3. customwas collected
4. washwashed with a little isopropanol