2H-Benzimidazole-2-spirocyclohexanes (1) when heated undergo a 1,5-sigmatropic rearrangement to 2,3-disubstituted 1H-benzimidazoles. A decided effect on the direction of this Isomerisation was observed with substituents in the homodiene ring.
J. A. L. Herbert, B. Iddon, A. G. Robinson and H. Suschitzky, J. Chem. Soc., Perkin Trans. 1, 1988, 991 DOI: 10.1039/P19880000991
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