反应详情

Optically active 4-(1-methylheptyloxycarbonyl)phenol (10 g, 0.04 mol) was dissolved in pyridine (70 ml), followed by dropwise adding to the solution, under cooling, 4-octyloxycarbonyloxybenzoic chloride (11.4 g, 0.035 mol) prepared in the same manner as in the paragraph (ii) of Example 1, agitating the mixture at 50°-60° C. for 2 hours, placing water and toluene in the reaction solution after completion of the reaction, sufficiently agitating the mixture, washing the separated toluene layer with 6N--HCl, then with 2N-NaOH aqueous solution, further with water until the washing water became neutral, drying the resulting toluene layer with anhydrous sodium sulfate, distilling off toluene to obtain a raw objective product, and recrystallizing this product from ethanol to obtain optically active 4-octyloxycarbonyloxybenzoic acid 4-(1-methylheptyloxycarbonyl)phenyl ester (5.2 g), which exhibited no liquid crystal phase and had a m.p. of 33.0° C. Further, by replacing octyl chloroformate used, by other alkyl chloroformates, various optically active 4-alkyloxycarbonyloxybenzoic acid 4-(1-methyl-heptyloxycarbonyl)phenyl esters are obtained. The phase transition points thereof are shown in Tables 1 and 2.

1. additionby dropwise adding to the solution
2. temperatureunder cooling
3. customafter completion of the reaction
4. stirringsufficiently agitating the mixture
5. washwashing the separated toluene layer with 6N
6. dry with materialdrying the resulting toluene layer with anhydrous sodium sulfate
7. distillationdistilling off toluene
8. customto obtain a raw objective product
9. customrecrystallizing this product from ethanol