A peri-Cyclised Naphthalene Dimer: Synthesis and Properties of an Unusual Vilsmeier-Haack Product of 1,3,6,8-Tetramethoxynaphthalene
作者:Michael Pittelkow、Christian B. Nielsen、Theis Brock-Nannestad、Magnus Schau-Magnussen、Jørn B. Christensen
DOI:10.1002/ejoc.201200512
日期:2012.9
An unusual peri-dimerised product was obtained when subjecting 1,3,6,8-tetramethoxynaphthalene to Vilsmeier–Haack reaction conditions (POCl3/DMF). The formation of this peri-dimerised naphthalene product suggests that 1,3,6,8-tetramethoxynaphthalene has comparable reactivity to that of Proton Sponge [1,8-bis(dimethylamino)naphthalene]. The octamethoxy peri-dimer was characterised using NMR spectroscopy
将 1,3,6,8-四甲氧基萘置于 Vilsmeier-Haack 反应条件 (POCl3/DMF) 中时,获得了一种不寻常的二聚产物。这种二聚萘产物的形成表明 1,3,6,8-四甲氧基萘具有与质子海绵 [1,8-双(二甲氨基)萘] 相当的反应性。使用核磁共振光谱、质谱、紫外/可见光谱、拉曼光谱、电化学、X 射线晶体学和 DFT 计算表征了八甲氧基二聚体。近二聚萘化合物的单电子氧化产生自由基阳离子,在低温下通过 EPR 光谱和 UV/Vis 光谱对其进行研究。DFT 计算证实了实验观察结果。