Propose the acid-catalyzed mechanism of conversion of (R)- into (S)-3,5-dimethylhexan-2-one.

Mechanism of acid-catalyzed tautomerization of (R)-3,5-dimethylhexan-2-one to (S)-isomer.

Detailed acid-catalyzed mechanism for converting (R)- to (S)-3,5-dimethylhexan-2-one.

Illustration of the acid-catalyzed tautomerization mechanism for (R)-3,5-dimethylhexan-2-one.

Acid-catalyzed mechanism showing conversion of (R)-3,5-dimethylhexan-2-one to (S)-isomer.