反应详情

88.5 g (0.5 mole) of 2,4-dichloro-6-methylphenol, 180 ml of dry xylene, 95 g (0.5 mole) of p-chloromethylbenzoyl chloride and 0.5 ml of pyridine were refluxed for 24 hours in a weak current of nitrogen with the exclusion of moisture. After cooling, the slightly turbid (pyridine hydrochloride), orange-colored solution was filtered free of a small amount of a blackish brown resin, and the filtrate was freed of xylene at diminished pressure. The residue (165 g=100%) crystallized after two days of standing to a light brown crystal mass, which was triturated in 200 ml of ice-cold petroleum ether and suction filtered. After drying, nearly colorless crystals were obtained with a melting point of 71°-73° C. Recrystallization from petroleum ether (1:10) yielded white needles melting at 74°-75° C.; no change in the melting point was brought about by repeated recrystallization.

1. temperatureAfter cooling
2. filtrationthe slightly turbid (pyridine hydrochloride), orange-colored solution was filtered free of a small amount of a blackish brown resin
3. customThe residue (165 g=100%) crystallized after two days
4. customwas triturated in 200 ml of ice-cold petroleum ether
5. filtrationsuction filtered
6. customAfter drying
7. customnearly colorless crystals were obtained with a melting point of 71°-73° C
8. customRecrystallization from petroleum ether (1:10)