Chemical shifts and spin–spin coupling constants of some 9,9′,10,10′-tetrahydro-9,9′-biphenanthryls indicate that they belong to the 9,9′-racemic series, that the 9,9′-link is formed from pseudo-axial bonds, and that the 10- and 10′-substituents occupy pseudo-axial positions.
D. Cohen, I. T. Millar, H. Heaney, P. R. Constantine, A. R. Katritzky, B. M. Semple and M. J. Sewell, J. Chem. Soc. B, 1967, 1248 DOI: 10.1039/J29670001248
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