their configurations. Tosylates of the syn-furyl-2-ketoximes remain unchanged, but syn-furyl-2-aryl-ketoxime tosylates undergo a Beckmann rearrangement to yield furan-2-carboxylic acid anilides, whereas the corresponding anti-furyl derivatives afford in general acetales of reactive unsaturated trioxo-compounds with opening of the furan ring. An exception to this rule is the tosylate of anti-5-methyl-f