| abstract |
Optically active compounds having the following formulae (1), (2) or (3) <IMAGE> (1) <IMAGE> (2) <IMAGE> (3) wherein R and R' are C1-20 alkyl groups; X and Y1 are -, O, S, or divalent groups such as COO, OOC and OCOO; m is 0 or 1; n is 0 to 5; A2 is a cyclic group, such as p,p'-biphenylene, 2,6-naphthylene, 2,5-pyrimidinylene-1,4-phenylene, A1-Y2-pyridylene or A4-Y2-A5; Y2 is CH2CH2 or C 3BOND C; A3 is 2,6-naphthylene, A1-Y2-pyridylene or A6-CH2CH2-A7; and A1, A4, A5, A6 and A7 are cyclic groups, such as 1,4-phenylene and/or 4,4'-biphenylene. |