Abstract
The combined use of molar Kerr constants and electric dipole moments allows the determination of the major conformers of bis(2-R-benzimidazol-1-yl)methanes. For R = methyl and ethyl, conformers A (trans-trans-anti) and C (cis-cis-anti) are present, whereas for R = adamant-1-yl, the equilibrium involves conformers A and B (trans-cis-anti). In the case of R = t-butyl, the three conformations are present. It is possible to rationalize these proportions on the base of Taft's E 0 s steric parameter.
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