Esters are important flavor compounds because of the large number of accessible ester compounds,
their occurrence in a wide range of natural sources, various odor characteristics and their wide range of
uses in flavourings. The odor of esters is related to the organic acid and alcohol from which they
derived. Moreover, the odor intensity of esters decreases with the increase of molecular weight;
however, the flavor industry needs esters with strong odors and high molecular weight to prolong the
duration of the odor of flavorings. Esters containing sulfur can be synthesized to yield flavorsubstances with strong odor and high molecular weight, as flavor compounds containing sulfur exhibit
very low odor threshold levels and very good odor characteristics.