Selective nitration versus oxidative dealkylation of hydroquinone ethers with nitrogen dioxide
作者:R. Rathore、E. Bosch、J.K. Kochi
DOI:10.1016/s0040-4020(01)81329-6
日期:1994.1
Various alkyl-substituted p-dialkoxybenzenes (ArH) react readily with nitrogen dioxide (NO2) in dichloromethane solution via either nitration (ArNO2) or oxidative dealkylation to quinones (Q). Spectral transients indicate that these coupled processes from the dialkoxybenzene radical cation (ArH+·) formed as the common reactive intermediate from electron-transfer in the disproprtionated precursor [ArH
各种烷基取代的对二烷氧基苯(ArH)可以通过硝化(ArNO 2)或氧化脱烷基化成醌(Q)与二氯甲烷溶液中的二氧化氮(NO 2)反应。光谱瞬变指示来自二烷氧基苯自由基阳离子这些耦合过程(ARH +·形成为从disproprtionated前体电子转移常见的反应中间体)ARH,NO + ] N0 3 - 。在快速的后续步骤中。ARH +·经历均裂耦合与NO 2(这会导致芳烃硝化)和NO的亲核攻击3 -(这导致氧化脱烷基)。这样,通过溶剂极性和添加的硝酸盐可以有效地调节硝化和氧化脱烷基之间的竞争。