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Braunschweig H, Damme A, Gamon D, et al. Synthesis, coordination behavior, and reduction chemistry of cymantrenyl-1,3-bis(2,3,4,5-tetraphenyl)borole. Chemistry. 2012;18(27):8430-6doi: 10.1002/chem.201200284.
Braunschweig, H., Damme, A., Gamon, D., Kelch, H., Krummenacher, I., Kupfer, T., & Radacki, K. (2012). Synthesis, coordination behavior, and reduction chemistry of cymantrenyl-1,3-bis(2,3,4,5-tetraphenyl)borole. Chemistry (Weinheim an der Bergstrasse, Germany), 18(27), 8430-6. https://doi.org/10.1002/chem.201200284
Braunschweig, Holger, et al. "Synthesis, coordination behavior, and reduction chemistry of cymantrenyl-1,3-bis(2,3,4,5-tetraphenyl)borole." Chemistry (Weinheim an der Bergstrasse, Germany) vol. 18,27 (2012): 8430-6. doi: https://doi.org/10.1002/chem.201200284
Braunschweig H, Damme A, Gamon D, Kelch H, Krummenacher I, Kupfer T, Radacki K. Synthesis, coordination behavior, and reduction chemistry of cymantrenyl-1,3-bis(2,3,4,5-tetraphenyl)borole. Chemistry. 2012 Jul 02;18(27):8430-6. doi: 10.1002/chem.201200284. Epub 2012 May 25. PMID: 22639411.
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Chemistry. 2012 Jul 02;18(27):8430-6. doi: 10.1002/chem.201200284. Epub 2012 May 25.

Synthesis, coordination behavior, and reduction chemistry of cymantrenyl-1,3-bis(2,3,4,5-tetraphenyl)borole.

Chemistry (Weinheim an der Bergstrasse, Germany)

Holger Braunschweig, Alexander Damme, Daniela Gamon, Hauke Kelch, Ivo Krummenacher, Thomas Kupfer, Krzysztof Radacki

Affiliations

  1. Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. [email protected]

PMID: 22639411 DOI: 10.1002/chem.201200284

Abstract

We describe the synthesis of base-free bisborole [Cym(†)(BC(4)Ph(4))(2)]-Cym(†)=(OC)(3)Mn(η(5)-C(5)H(3))-and its transformation into two fully characterized Lewis acid-base adducts with pyridine bases of the type 4-R-NC(5)H(4) (R=tBu, NMe(2)). The results of electrochemical, as well as NMR and UV/Vis spectroscopic studies on [Cym(†)(BC(4 Ph(4))(2)] and the related monoborole derivative [Cym(BC(4)Ph(4))]-Cym=(OC)(3)Mn(η(5)-C(5) H(4))-provided conclusive evidence for 1) the enhanced Lewis acidity of the two boron centers that result from conjugation of two borole fragments, and 2) the fact that Mn-B bonding interactions between the Lewis acidic borole moieties and the Mn center are considerably less pronounced for bisborole [Cym(†)(BC(4)Ph(4))(2)]. In addition, the reduction chemistry of [Cym(†)(BC(4)Ph(4))(2)] has been studied in detail, both electrochemically and chemically. Accordingly, chemical reduction of [Cym(†)(BC(4)Ph(4))(2)] with magnesium anthracene afforded the corresponding tetraanion, which features a rare Mg-OC bonding mode in the solid state.

Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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