<i>N</i>-<i>tert</i>-Butoxy-1-aminopyrenyl Radicals. Isolation, Electronic Structure, and Magnetic Characterization<sup>1</sup>
作者:Yozo Miura、Nobuaki Matsuba、Rika Tanaka、Yoshio Teki、Takeji Takui
DOI:10.1021/jo0202785
日期:2002.12.1
(6) free radicals were generated by the reaction of the lithium amides of the corresponding 1-aminopyrenes with tert-butyl peroxybenzoate in THF at -78 degrees C. Although 6 could not be isolated due to the gradual decomposition in solution, 4 and 5 were quite persistent and could be isolated as monomeric radical crystals. The X-ray crystallographic analyses for the isolated free radicals were successfully
N-叔丁氧基-2,7-二叔丁基-1-吡咯烷基(4),N-叔丁氧基-2-叔丁基-1-吡咯烷基(5)和N-叔丁氧基-7相应的1-氨基amino的锂酰胺与过氧苯甲酸叔丁酯在-78℃下的THF反应生成了叔-叔丁基-1-吡喃基(6)自由基。尽管由于在溶液中逐渐分解,4和5相当持久,可以分离为单体自由基晶体。对分离出的自由基进行了X射线晶体学分析,表明N和O原子与the环几乎共面。由于存在许多磁性不等价的质子,因此4和5的ESR光谱非常复杂。因此,质子超精细偶联(hfc)常数由(1)H ENDOR / TRIPLE共振光谱法测定。为了指定the环质子的hfc常数,制备了部分氘代的自由基4-d(4),并测量了ENDOR和ESR光谱。为了讨论4和5 ab的自旋密度分布,采用DTO UBecke 3LYP方法,使用STO 6-31G基组,进行了从头算分子轨道计算。用SQUID磁力计对4和5进行磁化率测量。对