Reduction of Mono- and Diboranes(4)

最近的初步工作表明，硼基阴离子、二硼烯和无金属硼烯的一些成功合成为这些化合物的通用策略提供了广阔的前景。其中包括在均质条件下使用有机金属物种进行化学计量还原、使用新的硼取代模式和用于稳定硼中心的灵活碱以及应用全卤化乙硼烷(4)来制备硼-硼多重键合。这些制备方法将应用于还原硼物质（硼基阴离子、二硼烯和无金属硼烯）的合成。除了对目标分子进行全面表征（特别是通过 ESR 光谱、循环伏安法以及 DFT 和 TD-DFT 计算指导）之外，我们还建议对目标分子进行广泛的反应性研究。这些减少的硼物质将用于许多合成目标，特别是用于合成新的含硼杂环。将探讨含有 B-B 多重键合的合成化合物作为发色团的适用性，以及它们作为电子精确低聚硼烷物种的合成子的用途。

Recent preliminary work has shown a handful of successful syntheses of boryl anions, diborenes and metal-free borylenes that offer much promise as general strategies towards these compounds. Among these are the use of organometallic species for stoichiometric reductions in homogeneous conditions, the use of new boron-substitution patterns and flexible bases for stabilisation of the boron centres, and the application of perhalogenated diboranes(4) for the preparation of boron-boron multiple bonding. These preparative approaches will be applied towards the synthesis of reduced boron species (boryl anions, diborenes and metal-free borylenes). In addition to the comprehensive characterisation of the target molecules, notably by ESR spectroscopy, cyclovoltammetry and guidance from DFT and TD-DFT calculations, we propose extensive reactivity studies of the target molecules. These reduced boron species will be utilised towards a number of synthetic goals, particularly for the synthesis of new boron-containing heterocycles. The suitability of synthesised compounds containing B-B multiple bonding as chromophores will be probed, as well as their use as synthons for electron-precise oligoborane species.