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Abstract
AbstractReference compounds based on borazine units and polyborylborazines have been characterized by 15N solid‐state NMR. The various nitrogen sites (B3N, B2NH, B2NX (X = H, Me, iPr), BN(H)X and BNX2 (X = Me, iPr) have been discriminated according to their cross‐polarization behaviour and chemical shift values, which range from −265 to −350 ppm. This has permitted the elucidation of the polymerization mechanism associated with the polycondensation of two borazine‐based derivatives. In particular, this technique appears to be a powerful investigation tool for finding whether the B3N3 rings are linked through three‐atom NBN aminoboryl bridges or connected by direct BN bonds. Copyright © 2004 John Wiley & Sons, Ltd.
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