G. Alhakimi et al., SYNTHESIS OF NEW POLYIMIDES BY DIELS-ALDER REACTION OF BIS(2-PYRONE)SWITH BISMALEIMIDES, Journal of polymer science. Part A, Polymer chemistry, 33(7), 1995, pp. 1133-1142
The reaction of various substituted bis(2-pyrone)s with bismaleimides
in dilute solution was carried out to produce linear soluble polymers
with coronand structure. The number-average molecular weights of the p
olymers ranged from 7000 to 18,000 (vapor pressure osmometry). Polymer
structures were identified by NMR spectroscopy and model reactions. T
he stereochemistry and the mechanism are discussed. (C) 1995 John Wile
y and Sons, Inc.