Dual Reactivity of a Stable Zwitterionic N-Heterocyclic Silylene and Its Carbene Complex Probed with Muonium
| العنوان: | Dual Reactivity of a Stable Zwitterionic N-Heterocyclic Silylene and Its Carbene Complex Probed with Muonium |
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| المؤلفون: | Matthias Driess, Amitabha Mitra, Paul W. Percival, Robert West, Shenglai Yao, Yun Xiong, Brett M. McCollum, Jean-Claude Brodovitch, Mina Mozafari |
| المصدر: | Organometallics. 31:2709-2714 |
| بيانات النشر: | American Chemical Society (ACS), 2012. |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | Radical, Organic Chemistry, Muonium, Silylene, Muon spin spectroscopy, Photochemistry, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Physical and Theoretical Chemistry, Methylene, Carbene, Hyperfine structure, Methyl group |
| الوصف: | The reactivity of the multifunctional cyclic silylene 4 and its carbene complex 5 have been investigated by a combination of muon spin spectroscopy and computation. The free radicals formed by muonium (Mu) addition to 4 were identified, showing that there are two dominant sites of free radical attack: on the Si atom and on the exocyclic methylene carbon. Reaction of muonium with 5 also produced two radicals, but with markedly different hyperfine constants. For both compounds avoided level-crossing resonance spectra and calculation of hyperfine constants show that one of the radicals results from Mu addition to the methylene group, yielding radicals 4a and 5a. Each contains a muoniated methyl group, −CH2Mu, which undergoes restricted rotation with respect to the plane of the ring. For 4 the second product is readily assigned as the muoniated silyl radical 4b, on the grounds of its high muon hyperfine constant (716 MHz). The second product from 5 shows instead a very small coupling constant, 19 MHz, assigna... |
| تدمد: | 1520-6041 0276-7333 |
| DOI: | 10.1021/om200966p |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::aa3c4b3aa68265e4c8dc13dd57d09138 https://doi.org/10.1021/om200966p |
| رقم الانضمام: | edsair.doi...........aa3c4b3aa68265e4c8dc13dd57d09138 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15206041 02767333 |
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| DOI: | 10.1021/om200966p |