The meso- and (±)-diastereoisomers of the chloro-, bromo-, and iodo-derivatives of the ethane [Ph(p-XC6H4)CH]2 are prepared by free-radical dimerisation. Their conformations, as well as those of the corresponding monomers Ph(p-XC6H4)CH2, are examined by electric birefringence, dipole moment, and i.r. spectroscopic measurements.
S. P. Chen and H. H. Huang, J. Chem. Soc., Perkin Trans. 2, 1972, 1301 DOI: 10.1039/P29720001301
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