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Syntheses and structures of benzo-bis(1,3,2-diazaboroles) and acenaphtho-1,3,2-diazaboroles

Abstract : Colorless crystalline 2,6-dibromo-4,8-dimethyl-1,3,5,7-tetraphenylbenzobis(diazaborole) 4 resulted from the cyclocondensation of 3,6-dimethyl-1,2,4,5-tetraphenylaminobenzene 3d with two equivalents of boron tribromide in the presence of calcium hydride. Synthesis of the dark-red crystalline 2-bromo-N,N’-bis(diisopropylphenyl)acenaphtho-1,3,2-diazaborole 7 was effected by the cyclocondensation of 1,2-bis(N-2’,6’-diisopropylphenylimino)acenaphthene (5) and boron tribromide with subsequent sodium amalgam reduction of the initially formed burgundy red diazaborolium salt 6. Compounds 4, 6 and 7 are characterised by elemental analyses, 1H, 11B and 13C NMR spectroscopy, as well as by single X-ray diffraction studies. The electronic structures of 4, 6 and 7 are subject to DFT calculations.
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https://hal.archives-ouvertes.fr/hal-02348702
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Submitted on : Tuesday, November 5, 2019 - 2:13:27 PM
Last modification on : Wednesday, February 3, 2021 - 3:26:17 AM

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Lothar Weber, Daniel Eickhoff, Anna Chrostowska, Alain Dargelos, Clovis Darrigan, et al.. Syntheses and structures of benzo-bis(1,3,2-diazaboroles) and acenaphtho-1,3,2-diazaboroles. Dalton Transactions, Royal Society of Chemistry, 2019, 48, pp.16911-16921. ⟨10.1039/C9DT03818C⟩. ⟨hal-02348702⟩

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