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Formation of Polymeric Lewis Acid–Lewis Base Complexes with Well-defined Organoboron Polymers

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The binding of Lewis bases to organoboron polymeric Lewis acids has been studied and the parameters that determine the complexation equilibrium have been investigated, which include (i) the strength of the individual Lewis acids and Lewis bases, (ii) concentration, and (iii) temperature. While the strongly Lewis acidic borane polymers poly(4-bis(pentafluorophenyl)borylstyrene) (PS-BPf) and poly(4-(di-2-thienylboryl)styrene) (PS-BTh) form isolable complexes with strong Lewis bases such as 4-t-butylpyridine (tPy), a temperature dependent equilibrium is established with weaker bases such as THF. Similarly, the weakly Lewis acidic boronate polymer poly(4-diethoxyborylstyrene) (PS-BOEt) undergoes a temperature dependent equilibrium with the strong Lewis base 4-dimethylaminopyridine (DMAP), while poly(4-pinacolatoborylstyrene) (PS-BPin) does not significantly bind to pyridine bases. Decomplexation of PS-BTh· t Py is achieved by treatment with the stronger Lewis acid, B(C6F5)3, thereby confirming the reversible nature of the polymeric Lewis acid–base adducts.

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Acknowledgments

We thank the National Science Foundation (NSF CAREER award CHE-0346828 to F.J. and MRI 0116066), the donors of the Petroleum Research Fund, administered by the American Chemical Society, and the Rutgers University Research Council for support of this research. F.J. is an Alfred P. Sloan research fellow.

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  1. Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ, 07102, USA

    Yang Qin & Frieder Jäkle

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Correspondence to Frieder Jäkle.

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This paper is dedicated to Professor Ian Manners in gratitude of his guidance throughout the years and recognition of his scientific accomplishments

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Qin, Y., Jäkle, F. Formation of Polymeric Lewis Acid–Lewis Base Complexes with Well-defined Organoboron Polymers. J Inorg Organomet Polym 17, 149–157 (2007). https://doi.org/10.1007/s10904-006-9084-1

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