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. 2022 Nov 28;7(49):44786–44795. doi: 10.1021/acsomega.2c04783

Scheme 4. Reaction Mechanism for the Formation of the Four Possible Enols from DHH.

Scheme 4

Blue arrows in the molecular structures indicate the electron flow. Transition states of the reactions are depicted using square brackets and atoms not taking part in the reaction are faded. Transition states corresponding to the keto–enol tautomerization are denoted with the letter E. Indices of the species and carbon atoms numbering correspond to those in Scheme 2.