Synthesis and Characterization of Some Novel Homo- and Hetero-Diradicals of Hydrazyl and Nitroxide Type
作者:Petre Ionita、Floriana Tuna、Marius Andruh、Titus Constantinescu、Alexandru T. Balaban
DOI:10.1071/ch06469
日期:——
congener 2,2-diphenyl-1-(4-cyano-2,6-dinitrophenyl)hydrazyl 2b, or from their reduced hydrazine counterparts 1a,b, it was possible to obtain the p-quinonoid compounds 4a,b by oxidation with ceric (Ce4+) sulfate, which by reduction gave the corresponding hydroxyl derivatives 2-phenyl-2-(4-hydroxyphenyl)-1-picrylhydrazine 5a or 2-phenyl-2-(4-hydroxyphenyl)-1-(4-cyano-2,6-dinitrophenyl)hydrazine 5b. These
从众所周知的稳定自由基 2,2-diphenyl-1-picrylhydrazyl (DPPH; 2a) 及其同系物 2,2-diphenyl-1-(4-cyano-2,6-dinitrophenyl)hydrazyl 2b 开始,或从它们的还原肼对应物 1a、b,可以通过用硫酸铈 (Ce4+) 氧化得到对醌类化合物 4a、b,通过还原得到相应的羟基衍生物 2-苯基-2-(4-羟基苯基)-1 -苦味肼5a或2-苯基-2-(4-羟基苯基)-1-(4-氰基-2,6-二硝基苯基)肼5b。这些羟基衍生物 (5a,b) 与 4-羧基-TEMPO 或 2,2-二苯基-1-(4-羧基-2,6-二硝基苯基)肼反应形成相应的酯 6a,b 或 8a,b。这些酯(6a,b 和 8a,b)导致杂杂双自由基(氮氧-肼型)7a,b 或同型双自由基(肼-肼型)9a,b 用二氧化铅或高锰酸钾氧化。通过UV-vis、NMR