prior formation of N-activated pyridines, organometallic reagents, and extra oxidation operation for the construction of a C–C bond at the C4-position of the pyridines in previous methods are not required. The corresponding mechanism and the key roles of the organoborane were elaborated by the combination of H/D scrambling experiments, 11B NMR studies, intermediate trapping experiments and computational
第一NaBEt 3 H-催化分子间吡啶Chichibabin型烷基化和其与烯烃作为潜亲核试剂衍生物呈现BET的协助3,以及一系列支链C4烷基化吡啶,即使高度拥塞全碳季中心含-三芳基甲烷可以以区域特异性方式获得。因此,传统上依赖于高成本和低可用性的过渡金属催化剂,先形成N活化的吡啶,有机金属试剂和在以前方法中不需要额外的氧化操作来在吡啶的C4位上构建C–C键。H / D加扰实验,11 B NMR研究,中间捕获实验和计算研究相结合详细阐述了有机硼烷的相应机理和关键作用。这种直接的,机械上独特的有机催化技术不仅为经典的但仍未得到很好开发的奇奇巴宾型反应打开一扇新门,而且为开发新型C–C键形成方法建立了新平台。
Substituent effects in solvolysis of 1,1-diphenylethylp-nitrobenzoates. Symmetrically disubstituted and monosubstituted systems
While any Y subsets gave statistically less reliable Y–T correlations, the apparent ρ value changed significantly depending on the fixed Y substituents; the ρ value decreases with the more electron-donating fixed substituents Y, which is compatible with the Hammond shift of the transition state coordinate. Nevertheless, the concave correlations of the More O'Ferrall non-linearity relationship for any