| Autor: |
Landmann, Johannes, Keppner, Fabian, Hofmann, Daniel B., Sprenger, Jan A. P., Häring, Mathias, Zottnick, Sven H., Müller‐Buschbaum, Klaus, Ignat'ev, Nikolai V., Finze, Maik |
| Předmět: |
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| Zdroj: |
Angewandte Chemie International Edition; Mar2017, Vol. 56 Issue 10, p2795-2799, 5p |
| Abstrakt: |
The first deprotonation of a borohydride anion was achieved by treatment of [BH(CN)3]− with strong non-nucleophilic bases, which resulted in the formation of alkali-metal salts of the tricyanoborate dianion B(CN)32− in up to 97 % yield and 99.5 % purity. [BH(CN)3]− is less acidic than (Me3Si)2NH but a stronger acid than iPr2NH. Less sterically hindered, more nucleophilic bases such as PhLi and MeLi mostly attack a CN group under formation of imine dianions [RC(N)B(CN)3]2−, which can be hydrolyzed to ketones of the [RC(O)B(CN)3]− type. The boron-centered nucleophile B(CN)32− reacts with CO2 and CN+ reagents to give salts of the [B(CN)3CO2]2− dianion and the tetracyanoborate anion [B(CN)4]−, respectively, in excellent yields. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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