Cleavage Reactions of Radical Anions that Range from Homolytic to Heterolytic within the Same Family of Compounds
作者:Zi-Rong Zheng、Dennis H. Evans、Soazara Chan-Shing、Jean Lessard
DOI:10.1021/ja9922779
日期:1999.10.1
nitrite from the radical anions were 3 × 106, 5 × 106, and 240 s-1 for 1a−c, respectively. Comparison of these potentials with those of related compounds demonstrates that reduction of the nitroalkyl portion of the molecule occurs in 1a and 1b while in 1c the electron is added to the nitrophenyl group. Thus, using previously defined terminology, the cleavage of the radical anions of 1a and 1b to give nitrite
三种 α-硝基枯烯(α-硝基枯烯、对氰基-α-硝基枯烯和对硝基-α-硝基枯烯,1a-c)的自由基阴离子的性质已通过电化学方法确定。特别地,发现中性/自由基阴离子对的标准电位相对于二茂铁离子/二茂铁电位为 -2.20、-2.04 和 -1.43 V,并且从自由基阴离子中排出亚硝酸盐的速率常数为 3 1a-c 分别为 × 106、5 × 106 和 240 s-1。将这些电位与相关化合物的电位进行比较表明,分子的硝基烷基部分的还原发生在 1a 和 1b 中,而在 1c 中,电子被添加到硝基苯基上。因此,使用先前定义的术语,1a 和 1b 的自由基阴离子裂解为亚硝酸盐和相应的枯基自由基是均裂反应的例子,但 1c 的自由基阴离子的裂解是异裂的。已经估计了三种裂解反应的驱动力并...