- Optically active compounds
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Optically active compounds having the following formulae (1), (2) or (3) STR1 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 CH2 CH2 or C C; A3 is 2,6-naphthylene, A1 -Y2 -pyridylene or A6 -CH2 CH2 -A7 ; and A1, A4, A5, A6 and A7 are cyclic groups, such as 1,4-phenylene and/or 4,4'-biphenylene.
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