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Note
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This effect was observed not only for unsymmetric substituted 10 and 11, but also for symmetric 1, 6, 7, 8, 9, 3. Taking into account that the dipole moment varies with the conformation of biphenyls and that the dipole of each ring can influence the conformation of biphenyl [53], the orthogonal geometry minimizes the steric interactions between ortho substituents but at expense of π-electron overlap. In this situation the unsymmetrical distribution of electron density in the near-orthogonal geometry can be related to the decreased π-electron overlap and, thus, to a sort of compensation to minimize the dipole moment.
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