Further experimental confirmation of the validity of prediction based on HMO calculations of the stability of isoindoles is provided by the synthesis of benz[e]isoindole, the second and simplest example to date of an isolable isoindole which is free of substituents in the pyrrole ring.
J. Bornstein, D. A. McGowan, A. L. DiSalvo, J. E. Shields and J. Kopecký, J. Chem. Soc. D, 1971, 1503 DOI: 10.1039/C29710001503
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