Synthesis and structure of 2-hydro-, 2-alkyl-, 2-alkynyl-, and 2-stannyl-2,3-dihydro-1H-1,3,2-diazaboroles

Weber L, Dobbert E, Stammler H-G, Neumann B, Boese R, Bläser D (1999)
European Journal of Inorganic Chemistry (3): 491-497.

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Abstract
1,3-Di-tert-butyl-2,3-dihydro-1H-1,3,2-diazoborole (4a) and 1,3-bis(2,6-dimethylphenyl)-2,3-dihydro-1H-1,3,2-diazaborole (4b) were formed by the reaction of the corresponding 2-bromo or 2-iodo derivatives 1a and 2b with LiAlH4. Treatment of 1a with n-butyllithium afforded 2-n-butyl-1,3-di-tert-butyl-2,3-dihydro-1H-1,3,2-diazaborole (5a), whereas 1,3-di-tert-butyl-2-cyano-2,3-dihydro-1H-1,3,2 (3a) was converted into the 2-tert-butyl derivative 6a or the 2-ethynyl-1,3,2-diazaborole 7a by means of tert-butyllithium or by the ethylenediamine adduct of Lithium acetylide. Similarly, 1,3-di-tert-butyl-2-trimethylstannyl-2,3-dihydro-1H-1,3,2-diazaborole (8a) and 1,3-bis(2,6-dimethylphenyl)-2-trimethylstannyl-2,3-dihydro-1H-1,3,2-diaz aborole (8b) were accessible from 1a or 2b and trimethylstannyllithium. In the complex 9a the compound 3a serves as an eta(1) ligand towards the [Cr(CO)(5)] unit via the cyano group. These novel compounds were characterized by H-1-, B-11-, C-13-, and Sn-119- NMR spectroscopy, as well as by X-ray structure analyses of 4b, 8a, and 9a.
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Weber L, Dobbert E, Stammler H-G, Neumann B, Boese R, Bläser D. Synthesis and structure of 2-hydro-, 2-alkyl-, 2-alkynyl-, and 2-stannyl-2,3-dihydro-1H-1,3,2-diazaboroles. European Journal of Inorganic Chemistry. 1999;(3):491-497.
Weber, L., Dobbert, E., Stammler, H. - G., Neumann, B., Boese, R., & Bläser, D. (1999). Synthesis and structure of 2-hydro-, 2-alkyl-, 2-alkynyl-, and 2-stannyl-2,3-dihydro-1H-1,3,2-diazaboroles. European Journal of Inorganic Chemistry(3), 491-497.
Weber, L., Dobbert, E., Stammler, H. - G., Neumann, B., Boese, R., and Bläser, D. (1999). Synthesis and structure of 2-hydro-, 2-alkyl-, 2-alkynyl-, and 2-stannyl-2,3-dihydro-1H-1,3,2-diazaboroles. European Journal of Inorganic Chemistry, 491-497.
Weber, L., et al., 1999. Synthesis and structure of 2-hydro-, 2-alkyl-, 2-alkynyl-, and 2-stannyl-2,3-dihydro-1H-1,3,2-diazaboroles. European Journal of Inorganic Chemistry, (3), p 491-497.
L. Weber, et al., “Synthesis and structure of 2-hydro-, 2-alkyl-, 2-alkynyl-, and 2-stannyl-2,3-dihydro-1H-1,3,2-diazaboroles”, European Journal of Inorganic Chemistry, 1999, pp. 491-497.
Weber, L., Dobbert, E., Stammler, H.-G., Neumann, B., Boese, R., Bläser, D.: Synthesis and structure of 2-hydro-, 2-alkyl-, 2-alkynyl-, and 2-stannyl-2,3-dihydro-1H-1,3,2-diazaboroles. European Journal of Inorganic Chemistry. 491-497 (1999).
Weber, Lothar, Dobbert, Eckhard, Stammler, Hans-Georg, Neumann, Beate, Boese, Roland, and Bläser, Dieter. “Synthesis and structure of 2-hydro-, 2-alkyl-, 2-alkynyl-, and 2-stannyl-2,3-dihydro-1H-1,3,2-diazaboroles”. European Journal of Inorganic Chemistry 3 (1999): 491-497.
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