Fast H/D Exchange of B,B′,B″-Tribromoborazine in C6D6 in the Presence of Aluminum Tribromide: First Evidence for an Electrophilic Substitution Reaction of Borazines in Solution

A solution of B,B′,B″-tribromoborazine (BrBNH)3 in excess C6D6 in a sealed NMR tube shows no changes for over 14 months at room temperature but undergoes fast (within minutes) H/D exchange in the presence of AlBr3 as a Lewis acid, as evidenced by 1H, 2H, 11B, and 27Al NMR spectroscopy. The proposed...

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Published inInorganic chemistry Vol. 50; no. 18; pp. 9039 - 9044
Main Authors Timoshkin, Alexey Y, Kazakov, Igor V, Lisovenko, Anna S, Bodensteiner, Michael, Scheer, Manfred
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 19.09.2011
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Summary:A solution of B,B′,B″-tribromoborazine (BrBNH)3 in excess C6D6 in a sealed NMR tube shows no changes for over 14 months at room temperature but undergoes fast (within minutes) H/D exchange in the presence of AlBr3 as a Lewis acid, as evidenced by 1H, 2H, 11B, and 27Al NMR spectroscopy. The proposed electrophilic exchange mechanism is in agreement with the results of DFT computations. To our knowledge, this is the first example of the electrophilic substitution reaction of borazines in solution.
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ISSN:0020-1669
1520-510X
DOI:10.1021/ic201240h