R loa, El= H 9a, R= H b, R= COC (CF,)(C, H,)(OMe) b, R= Me c. R= OH d: R= OMe which can be realized either from inexpensive hexoses of the D series: but with a critical inversion of configuration at position 5 at some stage of the sequence, or from the rather rare 6-deoxy sugar rhamnose.^ Accordingly, there is considerable interest in finding new chiral products which can be used as starting materials for syntheses of enantiomerically pure forms of ...