反应详情

50 Gram of 4-n-heptyl-4'-cyanobiphenyl and 500 g of 70 weight % sulfuric acid were introduced into a 2 l three neck flask and heated on a mantle heater with stirring under reflux for 2.5 hours, followed by water-cooling adding 500 ml of water, separating the resulting solid by filtration with a glass filter, water-washing and recrystallizing with glacial acetic acid, to give 47.3 g of 4-n-heptyl-biphenyl-4'-carboxylic acid ((II), R=C7H15), which was a colorless crystal having a molecular formula of C20H24O2 (composition: C 81.0%,H 8.2%, O 10.8% as calculated values and C 81.2%, H 8.3%, O 10.5% as observed values) and a melting point of 163° C and formed a smectic liquid crystal at temperatures exceeding the melting point.

1. temperatureheated on a mantle heater
2. temperatureunder reflux for 2.5 hours
3. temperaturecooling
4. customseparating the resulting solid
5. filtrationby filtration with a glass
6. filtrationfilter
7. washwater-washing
8. customrecrystallizing with glacial acetic acid