K. Y. Koltunov, I. Repinskaya
Mar 1, 2002
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0
Influential Citations
9
Citations
Journal
Russian Journal of Organic Chemistry
Abstract
According to the 1H and 13C NMR data, 5-azonia-4-hydroxynaphthalen-1-onium cation, generated by protonation of 8-hydroxyquinoline in the system CF3SO3H-SbF5, reacts with cyclohexane to give diprotonated 5,6,7,8-tetrahydroquinolin-8-one. Further reaction of the latter with cyclohexane yields 5,6,7,8-tetrahydroquinolinium ion. The reaction of 8-hydroxyquinoline with benzene in the presence of aluminum bromide or chloride gives 6-phenyl-5,6,7,8-tetrahydroquinolin-8-one and product of its intramolecular cyclization, 11-hydroxy-6,11-dihydro-6,11-methano-5H-benzo[5,6]cyclohepta[1,2-b]pyridine. The effect of the protonated nitrogen atom on the electrophilicity of dications is discussed.