Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/.
Angew Chem Int Ed Engl. 2014 Mar 17;53(12):3241-4. doi: 10.1002/anie.201309325. Epub 2014 Feb 19.
Synthetic access to electron-precise boron chains is hampered by the preferential formation of nonclassical structures. The few existing strategies for this involve either strongly reducing reagents or transition-metal catalysts, both with distinct disadvantages. The synthesis of new furyl- and thienyl-substituted diborenes is presented, along with their direct hydroboration with catecholborane (CatBH) to form a new electron-precise B-B bond and a B3 chain. The reaction is diastereoselective and proceeds under mild conditions without the use of strong reducing agents or transition-metal catalysts commonly used in B-B coupling reactions.
合成电子精确的硼链受到优先形成非经典结构的阻碍。现有的少数几种策略要么涉及强还原剂，要么涉及过渡金属催化剂，这两者都有明显的缺点。本文介绍了新的呋喃基和噻吩基取代二硼的合成及其与邻苯二硼酸（CatBH）的直接硼氢化反应，形成新的电子精确的 B-B 键和 B3 链。该反应具有立体选择性，在温和条件下进行，无需使用通常用于 B-B 偶联反应的强还原剂或过渡金属催化剂。
