Chemistry Letters

The synthesis and properties of 3-arylcyclohepta [d] isoxazolylium ions

M Nitta, N Kanomata

Index: Nitta, Makoto; Kanomata, Nobuhiro Chemistry Letters, 1986 , p. 1925 - 1928

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Abstract

3-Arylcyclohepta [d] isoxazolylium tetrafluoroborates were synthesized by the cycloaddition of tricarbonyl (2-5-η-2, 4, 6-cycloheptatrienone) iron with aromatic nitrile oxides followed by several reactions. The pK R+ values of these ions are less than+ 1.0 showing that the stability of the tropylium ions is much decreased by the fusion of the isoxazole ring.