Abstract
Poly(cyclodiborazane)s having boron-nitrogen four-membered structures in the main chains were prepared by the condensation reaction of bis(silylimine)s with substituted boranes such as chlorodialkylboranes and methyl dialkylborinates followed by cycloaddition of iminoborane species. Bis(silylimine)s prepared from terephthalaldehyde or isophthalaldehyde gave the corresponding polymers, whose number-average molecular weights (Mn) were around several thousands. The structures of poly(cyclodiborazane)s formed were confirmed by spectroscopic analyses such as 1H, 11B NMR, and IR spectra. The obtained polymers, however, became insoluble after exposure to air. On the other hand, when bis(silylimine)s derived from anthraquinone or sterically hindered boranes were used as a monomer, no polymerization took place.
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Chujo, Y., Tomita, I., Asano, T. et al. Synthesis of Poly(cyclodiborazane)s by the Reaction of Bis(silylimine)s with Chlorodialkylboranes or with Methyl Dialkylborinates. Polym J 26, 85–92 (1994). https://doi.org/10.1295/polymj.26.85
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DOI: https://doi.org/10.1295/polymj.26.85