reactivity of manganese dioxide in organic solvents was studied by reacting commercial manganese dioxide MnO2 with different substrates. The reaction of MnO2 with arylimino, indolinonic and quinolinic aromatic nitroxides gave quinoneimine N-oxides via an electron transfer process followed by oxygen transfer. A reduction potential of 0.9 V vs. NHE was roughly estimated for manganese dioxide in aprotic organic
通过使市售二氧化锰MnO 2与不同的底物反应,研究了二氧化锰在有机溶剂中的反应性。MnO 2与芳胺基,吲哚基和喹啉基的芳族硝基氧化物反应,通过电子转移过程再经氧转移得到醌亚胺N-氧化物。通过考虑那些能够与MnO 2反应的氮氧化物的氧化电位,可以粗略估计非质子有机溶剂中二氧化锰的还原电位为0.9 V vs. NHE 。通过与反应段-茴香胺的胺自由基阳离子最初是通过简单的电子转移过程形成的。在取代酚的情况下,分离的产物取自通过氢转移或等效方法产生的苯氧基。最后,通过磷原子对MnO 2的初始亲核攻击而产生的环状中间体中的氧原子转移,解释了三苯膦向三苯膦氧化物的定量转化。
Chemical and electrochemical synthesis of quinoneimine n-oxides from indolinone-3-arylimino nitroxide radicals