If the chromic acid oxidation is performed with stoichiometric oxidant in the presence of diethyl ether as co-solvent (a method introduced by H.C. Brown), the epimerization of l-menthone to d-isomenthone is largely avoided.
Apple cider vinegar isn't likely to be effective for weight loss. Proponents of the apple cider vinegar diet claim that drinking a small amount of apple cider vinegar before meals or taking an apple cider vinegar supplement helps curb appetite and burn fat. However, there's little scientific support for these claims.
Advocates say apple cider vinegar releases calcium and other minerals from the foods you eat so your body is better able to absorb and use them to strengthen bones. Vinegar allegedly allows the body to absorb one-third more calcium from green vegetables than it would without the aid of vinegar. Some fans also say apple cider vinegar is itself a great source of calcium.