First Isolation of Monomeric <i>N</i>-Alkoxyarylaminyl Radicals and Their Chemical and Magnetic Properties<sup>1</sup>
作者:Yozo Miura、Tatsuya Tomimura、Nobuaki Matsuba、Rika Tanaka、Masaaki Nakatsuji、Yoshio Teki
DOI:10.1021/jo0106288
日期:2001.11.1
The present report describes the first isolation of monomeric N-alkoxyarylaminyls and their chemical and magnetic properties. Reaction of the corresponding lithium amides of 2,4-diaryl-6-tert-butylanilines, 2,6-diaryl-4-tert-butylanilines, or 2,4,6-triarylanilines with tert-butyl peroxybenzoate in THF at -78 degrees C yielded quite persistent N-tert-butoxy-2,4-diaryl-6-tert-butylphenylaminyls (1),
本报告介绍了单体N-烷氧基芳基亚胺的首次分离及其化学和磁性。2,4-二芳基-6-叔丁基苯胺,2,6-二芳基-4-叔丁基苯胺或2,4,6-三芳基苯胺的相应氨基酰胺与过氧苯甲酸叔丁酯在-78度下反应C产生非常持久的N-叔丁氧基-2,4-二芳基-6-叔丁基苯基氨基(1),N-叔丁氧基-2,6-二芳基-4-叔丁基苯基氨基(2)和N-叔丁基分别以单体形式分离出-丁氧基-2,4,6-三芳基苯基氨基(3),产率为17-25%。制备的所有自由基均对氧不敏感且热非常稳定。对两个自由基进行了X射线晶体学分析,结果表明N和O原子与苯胺基苯环共面。1-3的ESR光谱给出a(N)= 0.984-1。05和a(H)(苯胺基间)= 0.158-0.170 mT(g = 2.0041-2.0043),表明未配对的电子主要存在于氮和苯胺基苯环上。对1和3的磁化率测量表明,一个自由基显示出弱的铁磁相互作用,并且根据居里-魏斯定律进行的分析得出,θ为0