Persistent Oxidation Dications from Twisted Fluoranthenes, Benzo[<i>k</i>]fluoranthene and Dimethyldibenzo[<i>j</i>.<i>l</i>]fluoranthene: Charge Delocalization Mode, Tropicity, and Formation of Novel 8,8‘-Bifluoranthenyls. An NMR and Theoretical Study
作者:Kenneth K. Laali、Takao Okazaki、Sergio E. Galembeck、Jay S. Siegel
DOI:10.1021/jo010571p
日期:2001.12.1
oxidation dications from fluoranthene-PAHs namely 1,3,4,6,7,10-hexamethyl- 2 and 3,4-dichloro-1,6,7,10-tetramethylfluoranthene 3, benzo[k]fluoranthene 6, and 3,6-dimethyldibenzo[j,l]fluoranthene 9 are reported. Charge delocalization mode and tropicity in the resulting nonalternant dications are examined. Quenching of the superacid solutions of the dications resulted in the formation of novel 8,8'-bifluoranthenyls
荧蒽-PAHs的持久氧化指示的第一个例子是1,3,4,6,7,10-六甲基-2和3,4-二氯-1,6,7,10-四甲基荧蒽3,苯并[k]荧蒽6报道了3,6-二甲基二苯并[j,1]荧蒽9。检查了电荷的非定域模式和生成的非替代指示中的嗜性。药物的超酸溶液的淬灭导致形成新的8,8′-联荧蒽基2a-4a。AM1用作指示剂生成(DeltaDeltaH(f)度和电离势)以及探测拥挤的荧蒽底物及其双荧蒽基的结构的初始指南。在某些情况下,按其B3LYP / 6-31G(d,p)含量计算出这些药物及其中性前体。获得电荷离域模式(NPA电荷的差异)和DFT / GIAO衍生的NMR化学位移,与实验进行比较;芳香性通过独立于核的化学位移(NICS)计算来评估。