Dipole moment and polarisability measurements indicate that, as solutes in carbon tetrachloride or benzene, the molecules p-C6H4(CH2X)2, where X is Cl, Br, I, or CN, adopt conformations in which the C–X bonds are in planes at ca. 90° to that of the C6H4 ring.
K. E. Calderbank, R. J. W. Le Fèvre and R. K. Pierens, J. Chem. Soc. B, 1970, 1463 DOI: 10.1039/J29700001463
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