Supramolecular equivalence of halogen, ethynyl and hydroxy groups. A comparison of the crystal structures of some 4-substituted anilines.
Chloro, bromo, and ethynyl substituents play exactly the same role in the crystal structures of the corresponding 4-substituted anilines and this is related to their similar polarizations. The iodo deriv. is, however, distinct and this may be related to its greater size.
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