作者:Yulia A. Khomutova、Vladimir O. Smirnov、Herbert Mayr、Sema L. Ioffe
DOI:10.1021/jo070633x
日期:2007.11.1
trialkylsilyl triflates was investigated by applying NMR techniques. In several cases, a flexible nitronate−bis(oxy)iminium ion (as an ion pair with triflate as counterion) equlibrium was found, and its thermodynamic parameters were determined. Elevation of temperature or dilution shifts this equilibrium toward the reactants. Activation parameters for the C,C-coupling reaction of silylated bis(oxy)iminium ions
通过应用NMR技术研究了各种硝酸盐与三烷基甲硅烷基三氟甲磺酸酯的甲硅烷基化。在几种情况下,发现了一种灵活的硝酸根-双(氧)亚胺离子(以三氟甲磺酸盐为抗衡离子的离子对)平衡,并确定了其热力学参数。温度升高或稀释将使这种平衡向反应物移动。确定了甲硅烷基化的双(氧)亚胺离子与一系列参比亲核试剂的C,C偶联反应的活化参数。当伴侣亲核性为N > 4时,估计的双(氧)亚胺离子的亲电子性使C和C耦合成为可能。