Abstract
The dipole moments of 1, 3, 5-triphenylpyrazole and a number of pyrazoline derivatives are determined. The presence of a C=C double bond in pyrazole does not lead to formation of a single π electron system in the heterocyclic ring. Comparison of found and calculated vector dipole moments confirms the appreciable effect of aromatic groups at position 1, and especially at position 3, and the slight effect at position 5.
References
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Lutskii, A.E., Shepel, A.V. & Obukhova, E.M. Dipole moments of molecules of 1, 3, 5-triaryl-δ2-pyrazolines. Chem Heterocycl Compd 3, 745–746 (1967). https://doi.org/10.1007/BF00468366
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DOI: https://doi.org/10.1007/BF00468366