Charge transfer facilitated direct electrophilic substitution in phenylaminonaphthoquinones: experimental, theoretical and electrochemical studies
作者:A. Satheshkumar、K. Ganesh、Kuppanagounder P. Elango
DOI:10.1039/c3nj01228j
日期:——
the quinone–HMB adduct is more susceptible to direct electrophilic substitution than the quinone alone. It was observed that there is a tremendous increase in the yield of the products. 1H and 13C NMR, 1H–H COSY, 1H NOSEY and LC-MS spectral analysis of the products indicated that the directing influence of the NH group plays a major role in determining the orientation in the substitution reactions. Density
一种简单有效的合成方案,可在2-(对-R-苯氨基)-3-氯-1,4-萘醌(其中R = H,Me,OMe )的苯环中引入吸电子取代基(Br和NO 2),F和Cl; 1a–e)已被证明使用分子间电荷转移(CT)络合现象作为催化剂。这些化合物在六甲基苯(HMB)作为电子给体伙伴的情况下经历了直接溴化(使用Br 2)和硝化(使用NO 2 BF 4)的过程,与1a–e形成CT络合物。结果表明,醌-HMB加合物比单独的醌更易于直接进行亲电取代。观察到产物的产率大大增加。产物的1 H和13 C NMR,1 H–H COSY,1 H NOSY和LC-MS光谱分析表明,NH基团的直接影响在确定取代反应的方向中起主要作用。还进行了密度泛函理论和电化学研究,以证实所提出的机理。还对反应物和产物的抗氧化和抗菌性能进行了初步研究。