Optically Active Poly ester-imide s

S. Mallakpour, S. Habibi, Microwave-promoted synthesis of new optically active poly (ester-imide)s derived from N, N -(p3Tomellitoyl)-bis-L-leucine diacid chloride and aromatic diols. Europ. Poly. J. 39, 1823-1829 (2003)... 

Facile and rapid polycondensation reactions of N,N -(pyromellitoyl)-bis-L-leucine diacid chloride, N,N -(pyromellitoyl)-bis-L-phenylalanine diacid chloride, 4,4 -earbonyl-bis(phthaloyl-L-alanine) diacid chloride or 4,4 -(hexafluoroisopropylidene)-N,N -bis(phthaloyl-Lleucine) diacid chloride with several aromatic diols such as phenol phthalein, bisphenol-A, 4,4 -hydroquinone, l,8-dihydro5g anthraquinone, 1,5-dihydroxy naphthalene, 4,4-dihydroxy biphenyl and 2,4-dihydroxyacetophenone were reported by using a domestic microwave oven in the presence of a small amount of a polar otganic solvent such as o-cresol (Mallakpour and Habibi, 2003). The polymerization reactions occurred rapidly and are completed within 10-20 min, producing a series of optically active poly(ester-imide)s with good yields and moderate inherent viscosities. 

The diphenol can be reacted by microwave irradiation with several optically active diacid chlorides such as AA -(pyromellitoyl)-bis-(L-a-amino) diacid chlorides derived from L-phenylalanine, L-leucine, L-methionine, L-valine, and L-alanine. The poly(ester-imide)s are obtained in good yields and with moderate inherent viscosities. 

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