N-heterocyclic carbene ligands with a bicyclic framework fused with either naphthalene or anthracene
作者:Shin Ando、Yoko Kono、Tadao Ishizuka
DOI:10.1016/j.jorganchem.2022.122576
日期:2023.1
study, which showed structural changes that depended on the bound metals. Although the NHCs analyzed in this study involve the same bicyclo[2.2.1]heptene core, three aromatic rings, benzene, naphthalene, and anthracene, caused different interplanar angles between the aromatic rings and the NHC's five-membered rings. The regio-selectivities during copper-catalyzed allylic arylation were found to be related
Electronic control of stereoselectivity. 17. [4 + 2] Cycloadditions to norbornyl- and norbornenyl-fused anthracene systems
作者:Peter C. Hayes、Leo A. Paquette
DOI:10.1021/jo00156a022
日期:1983.4
Linear Extension of Carbaporphyrin Chromophores: Synthesis, Protonation, and Metalation of Anthro[2,3-<i>b</i>]carbaporphyrins: Evidence for 30π-Electron Aromatic Circuits in a Palladium(II) Complex
作者:Melissa A. Mathius、Justin M. Chhoeun、Riley H. Kaufman、Deyaa I. AbuSalim、Timothy D. Lash
DOI:10.1021/acs.joc.3c01839
日期:2024.1.5
only weakly aromatic and possesses a 32-atom 30π electron delocalization pathway. Alkylation with methyl iodide and potassium carbonate gave a 22-methyl derivative that reacted with palladium(II) acetate to afford an aromaticpalladium(II) complex. Upon heating, the methyl group migrated from the nitrogen to the internal carbon atom and the resulting complex exhibited diminished aromatic character.
萘并[2,3- f ]茚满二醛与三吡喃在酸催化下缩合,然后进行氧化步骤,得到蒽[2,3- b ]-21-碳卟啉。稠合蒽单元的存在引起轻微的红移,并且没有显着影响卡卟啉核心的芳香特征。质子化导致形成具有类似二异性性质的单阳离子,但在大量过量的三氟乙酸存在下产生的双阳离子具有减弱的索雷带吸收和在754 nm处的宽吸收。与核无关的化学位移 (NICS) 计算表明,双阳离子仅具有弱芳香性,并且具有 32 个原子的 30π 电子离域路径。用甲基碘和碳酸钾进行烷基化,得到 22-甲基衍生物,该衍生物与乙酸钯 (II) 反应,得到芳香族钯 (II) 络合物。加热后,甲基从氮迁移到内部碳原子,所得络合物表现出减弱的芳香特征。与没有环稠合或苯并或萘并稠合单元的相关碳卟啉复合物的比较表明,随着共轭性的增加,二异性特征降低。 NICS 计算和感应电流密度各向异性 (AICD) 图证实了这一趋势,并表明蒽卡卟啉复