Hexahydropyrenium dications

Extensive studies of naphthalenium cations were later reported by Lammertsma and Cerfontain.1314 Figure 2 summarizes the H NMR data and A<513C values for a series of isomeric monomethyl-, dimethyl-, trimethyl-, and tetramethylnaphthalenium, as well as for hexahydropyrenium mono- and dications. Methyl groups exert strong directive and charge-stabilizing effects. The hexahydropyrenium dication shows dramatic charge localization in the ortho positions. Ipso protonation is observed with 1,4,5-trimethyl and 1,2,3,4-tetramethyl derivatives. 

---

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

---