Synthesis of Tetraborylethenes and 1,1,1′,1′-Tetra- and Hexaborylethanes; Electronic Interactions in Tetraborylethenes and 1,1,1′,1′-Tetraborylethanes, and HF-SCF Calculations
作者:Martin Bluhm、Andreas Maderna、Hans Pritzkow、Sabine Bethke、Rolf Gleiter、Walter Siebert
DOI:10.1002/(sici)1099-0682(199910)1999:10<1693::aid-ejic1693>3.0.co;2-9
日期:1999.10
The catechol-substituted diboranes(4) 1 react with the catechol-substituted diborylacetylenes 2, in the presence of [Pt(PPh3)2(C2H4)] or [Pt(PPh3)4], to give tetra- and hexaborylethane derivatives. When [Pt(cod)2] is used as catalyst, the tetraborylethene 5a is formed exclusively. Catalytic hydrogenation of 5a affords the 1,1,1′,1′-tetraborylethane 4a, which has been studied by an X-ray structure analysis
在 [Pt(PPh3)2(C2H4)] 或 [Pt(PPh3)4] 存在下,儿茶酚取代的乙硼烷 (4) 1 与儿茶酚取代的二硼基乙炔 2 反应,得到四和六硼基乙烷衍生物。当[Pt(cod)2]用作催化剂时,仅形成四硼基乙烯5a。5a 的催化加氢得到 1,1,1',1'-四硼基乙烷 4a,已通过 X 射线结构分析对其进行了研究。4a 和 5a 的 RHF/3-21G 优化几何结构的自然键轨道 (NBO) 分析揭示了硼 pz 轨道的分子内稳定性。这包括 B-O、B-B 和激动的互动。报道了5a的光电子谱