Selective Formation of Poly(N,O-acetal) by Polymerization of 1,3-Benzoxazine and Its Main Chain Rearrangement

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Abstract

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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