. . . "Suitable esterification catalysts include hydrogen halides, such as hydrogen chloride, hydrogen bromide or the like; mineral acids such as sulfuric acid, nitric acid, phosphoric acid, or the like; organic acids, such as toluenesulfonic acid, benzenesulfonic acid, methanesulfonic acid, trifluoromethanesulfonic acid, trifluoroacetic acid, cationic ion exchange resins or the like; and Lewis acids, su" . .