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Excellent yield of a variety of silicon-boron radicals and their reactivity. | LitMetric
Herein we report stable silicon-boron radicals of composition LSi(NMe)-B(Br)Tip (1), LSi(NMe)-B(I)Tip (2) LSi(Bu)-B(I)Tip (3) [L = PhC(NBu)]. They were prepared in high yield using a one pot reaction of LSiR, XBTip and KC in a 1 : 1 : 1 molar ratio (R = Bu, NMe; X = Br, I). The reaction of the silicon-boron radical with Br and Se affords the dihalogenated compound LSi(Bu)-B(Br)Tip (4) and oxidative addition product LSi(Bu)Se (5). All the compounds were characterized by single-crystal X-ray structural analysis, electron paramagnetic resonance (EPR) analysis, elemental analysis, multinuclear NMR spectroscopy, and mass spectrometry. Quantum chemical calculations show that the B-centered radicals 1-3 are stabilised by hyperconjugative interactions.
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