A study of the i.r., n.m.r., and u.v. spectra of diacylbenzoylmethanes and acyldibenzoylmethanes, in which only two of the three acyl groups are involved in the hydrogen-bonded chelate ring, has shown that the benzoyl group is not involved in the enolic system. The reason for this has been shown to be steric and not electronic.
D. C. Nonhebel, J. Chem. Soc. C, 1968, 676 DOI: 10.1039/J39680000676
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