On the Synthesis, Characterization and Reactivity of N-Heteroaryl-Boryl Radicals, a New Radical Class Based on Five-Membered Ring Ligands
作者:Mohamad-Ali Tehfe、Stéphane Schweizer、Anne-Caroline Chany、Cédric Ysacco、Jean-Louis Clément、Didier Gigmes、Fabrice Morlet-Savary、Jean-Pierre Fouassier、Markus Neuburger、Théophile Tschamber、Nicolas Blanchard、Jacques Lalevée
DOI:10.1002/chem.201400197
日期:2014.4.22
The synthesis and physical characterization of a new class of N‐heterocycle–boryl radicals is presented, based on five membered ring ligands with a N(sp2) complexation site. These pyrazole–boranes and pyrazaboles exhibit a low bond dissociation energy (BDE; BH) and accordingly excellent hydrogen transfer properties. Most importantly, a high modulation of the BDE(BH) by the fine tuning of the N‐heterocyclic
基于具有N(sp 2)络合位点的五元环配体,提出了一类新的N-杂环-硼基自由基的合成和物理表征。这些吡唑硼烷和pyrazaboles表现出低键离解能(BDE;乙 1H),并相应地优良氢转移性能。最重要的是,在该系列中获得了通过N-杂环配体的微调对BDE(BH)的高调制,这可能与相应原子团的硼原子上的自旋密度有关。通过测定与加成烯烃和炔烃,加成O 2对应的几个反应速率常数,研究了后者对小分子化学的反应性。,碘盐的氧化和卤代烷的卤代。本文还提出了N-杂环-硼烷基的两种选择应用,用于自由基聚合和自由基脱卤反应。