Abstract
Optically active polyamides having (−)-1,2-trans-diaminocyclohexane [(−)-DA] or (+)-1,2-trans-cyclohexane dicarboxylic acid [(+)-CDA] residue in main chain were synthesized by polycondensation. Polyamides with a p-phenylene group in main chain showed better resolution for several racemic compounds than the polyamides with a polymethylene group [ –(–CH2–)–n– (n=2–7)] in main chain. Among the polyamides with a polymethylene group in main chain, the polyamides with a shorter polymethylene group showed better chiral recognition abilities than the polyamides with a longer polymethylene group. Polyamides derived from (−)-trans-3,6-endomethylene-1,2,3,6-tetrahydrophtharic acid [(−)-ETHF] showed low chiral recognition ability. CD spectra of these polyamides showed characteristic patterns. Odd-even effect was observed in CD spectra of the polyamides having a series of a polymethylene group.
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