| abstract |
NEW MATERIAL:A compound shown by formula I (R 1 is ≥4C alkyl or alkoxy; R 2 is ≤10C alkylene or single bond; R 3 is ≤20C alkyl, alkoxy, alkanoyl, etc.; (j) is 0 or 1; (i), (k) and (l) are ≤2 number; X is CCO, OCO, CH 2 O, C≡C, etc. ; Y is O or S; Z is methyl, ethyl, halogen, etc. ; A, B and D are 1,4-phenylene, 2,5-pyrimidilene, etc.; c* is asymmetric C). n EXAMPLE: (S)-2-(1-Methylpropyl)-5-(4-octyloxyphenyl)benzoxazole. n USE: A liquid crystal element having chemically stable molecular structure and low viscosity. n PREPARATION: A compound shown by formula II is made to react with an optically active acid chloride in a basic solvent such as pyridine to give a corresponding amide compound, which is heated or dehydrated in a mixed solvent comprising acetic anhydride and pyridine or with a dehydrating agent (e.g. polyphosphoric acid) and subjected to ring closure to give a compound shown by formula I. n COPYRIGHT: (C)1991,JPO&Japio |