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.
Acidic foods can increase the rate at which your body burns up carbs. They can also give your metabolism a good boost, which can lead to weight loss. Apple cider vinegar is no exception. The enzymes found in apple cider vinegar help digest food and regulate blood sugar levels.