反应详情

温度

155 °C

A mixture of 45.4 g (0.2 mole) of 2-(2',4'-dihydroxyphenyl)benzotriazole, 19.8 g (0.225 mole) of ethylene carbonate and 0.55 g (0.005 mole) of tetramethylammonium chloride was heated under argon while stirring in an oil bath. The mixture changed to a brown melt as the temperature rose to 140° C. The argon gas flow was stopped at this point and the temperature was raised to 155° C. After the evolution of carbon dioxide stopped (7-8 hours), the reaction mixture was cooled to about 100° C. and then within 5 minutes 150 mL of water was added while stirring. The mixture was cooled to room temperature while stirring, at which point the semi-solid looking product crystallized. After suctioning off the solid, washing with water, and drying; 2-[2'-hydroxy, 4'-(2"-hydroxyethoxy)phenyl]benzotriazole was obtained having purity of 98% (HPLC). Yield: 51.5 g (95% of the theoretical).

1. temperaturewas heated under argon
2. customrose to 140° C
3. custom(7-8 hours)
4. temperaturethe reaction mixture was cooled to about 100° C.
5. stirringwhile stirring
6. temperatureThe mixture was cooled to room temperature
7. stirringwhile stirring, at which point the semi-solid
8. customcrystallized
9. washwashing with water
10. customdrying