Polymerization behavior of N -phenylbenzoxazine in bulk was studies in detail to discover new reaction pathways: (1) formation of an intermediary polymer having N, O -acetal-type linkage in the main chain and (2) its rearrangement into Mannich-type linkage in the solid state. Efficient promotion of the main chain rearrangement was achieved by using a dual system composed of imidazole and sulfonic acid.
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Sudo et al. (2008) studied this question.
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