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.
If you drink a glass of water with 1 or 2 tablespoons of apple cider vinegar before your meals, the insoluble fiber with help you feel full with less food. The fiber will also decrease the likelihood of you binging on unhealthy foods between meals. Add these together, and you have the recipe for weight-loss success.