....And in those methods, d-tartaric acid is used to obtain the dextro amine and l-tartaric acid to prepare the laevo amine. However while those
processes are operable chemically, they have serious disadvantages, particularly with regard to the separation of l-amphetamine by means of d-tartaric
acid, in that while d-tartaric acid is readily available and comparatively cheap, l-tartaric acid at the present time is both difficult to
obtain and expensive in pure form (d tartaric acid comes from fruit, l-tartaric acid is 'unnatural').... |