Low Temperature NMR Study on p-Fluorophenylthioxanthylium Ions

[摘要] The thioxanthylium ion ard anthracenium ion have coplanar geometries. The empty pz-orbitals of the positive centers in the cations, therefore, overlap with the ¥ð-orbitals of the fused benzen rings. These cations have aromatic characters, obeying Huckel's (4n + 2)¥ð rule. The contribution of the sulfur atom to aromatic stabilization was estimated by comparing the 19F-nmr chemical shifts of the thioxanthylium ions and anthracenium ions.

[学科分类] 化学（综合）