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Synthesis of Novel Optically . Active Poly(amide-imide)s with Benzophenone and L-Alanine Moieties


3,3',4,4'-Benzophenonetetracarboxylic dianhydride (4,4'-carbonyldiphthalic anhydride) I was reacted with L-alanine 2 in a mixture of acetic acid and pyridine (3 :2) at room temperature, then was refluxed at 90—100 'C and the
resulting imide-ecid 4 was obtained in quantitative yield . The compound 4
was converted to the diacid chloride 5 by reaction with thionyl chloride . The
polymerization reaction of the imide-acid chloride 5 with benzidine 6a, 4,4'-diaminodiphenyl methane 6b, 1,5-diaminoanthraquinone 6c, 2,6- diamino pyridine 6d and 4,4'-sulfonyl dianiline 6e was carried out in DMAc solution
in the presence of pyridine . The resulting poly(amide-imides were obtained in
high yield and are optically active and thermally stable . All of the above
compounds were fully characterized by IR spectroscopy, elemental analyses
and specific rotation . Some structural characterization and physical properties
of this optically active poly(amide- imide)s are reported