Summary
The dipole moments of mono- and disubstitutedpara-xylene derivatives have been measured in benzene and other solvents. The results show clearly that there is interaction between methyl hydrogen atoms and the substituents in the position ortho to the methyl. A comparison with mesitylene and durene derivatives indicates the need to consider also the symmetry of the molecules and the uncertainties of atomic polarsation in a full understanding of the question.
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Anantakrishnan, S.V., Rao, D.S. Dipole moments of some derivatives ofpara-xylene—A possible intramolecular hydrogen bonding. Proc. Indian Acad. Sci. 60, 201–210 (1964). https://doi.org/10.1007/BF03046408
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DOI: https://doi.org/10.1007/BF03046408