反应详情

5-Hydroxy-2(4'-propyl-biphenyl-4-yl)pyrimidine (10 g, 0.034 mol) was dissolved in dichloromethane (100 ml), followed by adding (S)-6-methyloctanoic acid (7.9 g, 0.05 mol), DCC (20.6 g, 0.1 mol) and DMAP (3.3 g), agitating the mixture at room temperature for 2 hours, filtering off deposited crystals, washing the filtrate with 6N-HCl, then with 2N-NaOH and further with water until the washing water became neutral, drying the organic layer over anhydrous magnesium sulfate, distilling off dichloromethane and recrystallizing the residue from ethanol (150 ml) to obtain (S)-5-(6'-methyloctanoyloxy)-2-(4'-propylbiphenyl-4-yl)pyrimidine (9.9 g). This product was a liquid crystal and exhibited the following phase transition points (see also Table 1): ##STR88##

1. filtrationfiltering off
2. washwashing the filtrate with 6N-HCl
3. dry with materialdrying the organic layer over anhydrous magnesium sulfate
4. distillationdistilling off dichloromethane
5. customrecrystallizing the residue from ethanol (150 ml)