Making Aromatic Phosphorus Heterocycles More Basic and Nucleophilic: Synthesis, Characterization and Reactivity of the First Phosphinine Selenide
作者:Friedrich Wossidlo、Daniel S. Frost、Jinxiong Lin、Nathan T. Coles、Katrin Klimov、Manuela Weber、Tobias Böttcher、Christian Müller
DOI:10.1002/chem.202102390
日期:2021.9.6
The synthesis and isolation of a phosphinine selenide was achieved for the first time by reacting red selenium with 2,6-bis(trimethylsilyl)phosphinine. The rather large coupling constant of 1JP,Se=883 Hz is in line with a P−Se bond of high s-character. The σ-electron donating Me3Si-substituents significantly increase the energy of the phosphorus lone pair and hence its basicity, making the heterocycle
通过红硒与2,6-双(三甲基甲硅烷基)膦的反应,首次实现了硒化膦的合成和分离。1 J P,Se =883 Hz的相当大的耦合常数符合高s 特性的 P-Se 键。提供 σ 电子的 Me 3 Si 取代基显着增加了磷孤对电子的能量,从而增加了它的碱性,使杂环比未取代的膦 C 5 H 5更具碱性和亲核性P,由计算的气相碱度证实。NBO 计算进一步表明,硒原子的孤对通过供体 - 受体与芳环的反键轨道相互作用而稳定。新颖phosphinine硒节目向六氟-2-丁炔的独特反应性,金(I)氯,以及我PrOH中。我们的结果为低配位磷化学的新视角铺平了道路。