Kinetics and Mechanism of Acid-Catalyzed Oxidation of Substituted Toluenes by Pyridinium Fluorochromate
作者:Bharati Bhattacharjee、Manabendra Nath Bhattacharjee、Mitra Bhattacharjee、Apurba Krishna Bhattacharjee
DOI:10.1246/bcsj.59.3217
日期:1986.10
The kinetics of oxidation of substituted toluenes by pyridinium fluorochromate(VI) (PFC), C5H5N\overset+HCrO3F−, in aqueous acetic acid, in the presence of perchloric acid, have been studied. The main products are the corresponding aldehydes. While each of the oxidation is first order with respect to the oxidant, the rate is almost independent of the substrate concentration. The reactions depend on
已经研究了氟铬酸吡啶 (VI) (PFC),C5H5N\overset+HCrO3F-,在乙酸水溶液中,在高氯酸存在下氧化取代甲苯的动力学。主要产品为相应的醛类。虽然每种氧化都相对于氧化剂是一级的,但其速率几乎与底物浓度无关。反应取决于酸浓度的第一次幂。观察到动力学同位素效应,在 30 °C 时 kH⁄kD=5.4。发现电子释放基团适度促进反应,而吸电子基团被发现具有延迟效应。与 σ 值的相关性产生 -2.0 的 ρ 值。该反应不会引起丙烯腈的聚合。研究了温度和溶剂组成的影响并评估了活化参数。这些和相关数据表明,初始反应涉及提取氢,形成中间体,随后产生...