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用ESR研究了菲醌(PQ)、四氟对寒醌(TClQ)、2,3-二氯-5,6-二氰苯醌(DDQ)和苯醌(BQ)与三乙胺、(Et_3bN)的电子转移反应过程。实验结果表明,醌上取代基吸电子能力越强,越易与Et_3N反应,但所形成半醌负离子自由基的稳定性,则并未有此规律,而是由自由基终止机理所决定。由实验得到了DDQ与Et_3N的表变曲线。本文讨论了DDQ与Et_3N反应的机理,并得其反应的微分方程,用实验拟合曲线确定速率常数。然后,对该方程求解,与实验曲线比较初步确定了该反应的历程。
The effects of phenanthrenequinone (PQ), tetrafluorophenazone (TClQ), 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) and benzoquinone (BQ) with triethylamine, ) Electron transfer reaction process. The experimental results show that the stronger the electron withdrawing ability of substituent on quinone is, the easier it is to react with Et_3N. However, the stability of the anion of half-quinone anion is not the rule, but determined by the mechanism of radical termination. The curves of DDQ and Et_3N were obtained experimentally. In this paper, the mechanism of reaction between DDQ and Et_3N is discussed, and the differential equation of the reaction is obtained. The rate constant is determined by fitting the experimental curve. Then, the equation is solved and compared with the experimental curve to initially determine the course of the reaction.