Cycloaddition of 3-oxido-1-phenylpyridinium 8a to 1-cyanoacenaphthylene 9a affords three isomeric adducts (13, 14 and 15). Structures for these compounds resulted from a comparative NMR study, as well as an X-ray crystallographic determination of isomer 15. Attempts to eliminate HCN from compounds 13–15 resulted only in cycloreversion to 1-cyanoacenaphthylene.
Y. A. Jackson, L. M. Rogers, R. D. Rogers and M. P. Cava, J. Chem. Soc., Perkin Trans. 1, 1998, 1865 DOI: 10.1039/A709091I
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