FRAGMENTS OF BIOPOLYMERS CONTAINING GLYCOSYL PHOSPHATE RESIDUES .12. THE SYNTHESIS OF GLYCOSYL PHOSPHOSUGARS CONTAINING 2-ACETAMIDO-2-DEOXY-ALPHA-D-MANNOPYRANOSYL PHOSPHATE RESIDUES INCLUDING A FRAGMENT OF THECAPSULAR ANTIGEN FROM NEISSERIA-MENINGITIDIS A

3,4,6-tri-O-benzoyl-2-deoxy-alpha-D-mannopyranosyl hydrogenphosphonate was synthesised and used for the first syntheses of glycosyl phosphos ugars containing N acetylmannosamine residue. The phosphodiesters prep ared include ManNAc(alpha)-P-6Man(alpha)Me, an analogue of the fragmen t of some lysosomal glycoproteins, and ManNAc(alpha)-P-6ManNAc(alpha)N p, a derivative of the fragment of the capsular antigen from Neisseria meningitidis A.