作者:Julia I. Schweizer、Alexander G. Sturm、Timo Porsch、Matthias Berger、Michael Bolte、Norbert Auner、Max C. Holthausen
DOI:10.1002/zaac.201800163
日期:2018.9.17
A combined experimental and theoretical study on the reaction of Si2Br6 with N‐heterocyclic carbenes is reported. Employment of an imidazole‐2‐ylidene with methyl groups in C4‐ and C5‐position results in the disproportionation of Si2Br6 into the adducts NHC→SiBr2 and NHC→SiBr4. According to expectation, the hydrogenated derivative 1,3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene forms analogous disproportionation
报道了Si 2 Br 6与N-杂环卡宾反应的组合实验和理论研究。在C 4和C 5位上使用带有甲基的咪唑-2-亚烷基会导致Si 2 Br 6歧化成加合物NHC→SiBr 2和NHC→SiBr 4。根据预期,氢化衍生物1,3-双(2,6-二异丙基苯基)咪唑-2-亚甲基在低温下形成Si 2 Br 6的类似歧化产物,而在较高温度下的反应则提供4-SiBr 3取代的NHC。通过密度泛函理论计算探索的下层形成机理具有异常的卡宾中间体。