The electron paramagnetic resonance spectra of 3,6-dimethyl-1,2,4,5-tetrahydrobenzobiscyclobutene and 3,4,5,6-tetramethyl-1,2-dihydrobenzocyclobutene show that the ψA MO lies above the ψS MO, although the reverse order would be expected from the relative electron releasing power of the substituents; this is rationalised in terms of rehybridisation of the arene carbon atoms imposed by ring strain.
A. G. Davies and K. M. Ng, J. Chem. Soc., Perkin Trans. 2, 1992, 1857 DOI: 10.1039/P29920001857
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