The spin–lattice relaxation times and nuclear Overhauser enhancements (NOE) have been measured for the olefinic protons of cis-stilbene and a few derivatives in dilute solution in CDCl3. The results confirm the propeller conformation suggested previously on the basis of the electronic spectrum. The angle of twist is in the range 20–40°.
F. Heatley, M. K. Cox, A. Jones and B. Jacques, J. Chem. Soc., Perkin Trans. 2, 1976, 510 DOI: 10.1039/P29760000510
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