Methyl (4,5,7,8-tetra-O-acetyl-3-deoxy-α-D-manno-2-octulopyranosyl bromide)-onate 、 Benzyl-3-O-benzyl-2-<(R)-3-benzyloxytetradecanoylamino>-6-O-<2-<(R)-3-benzyloxytetradecanoylamino>-2-desoxy-3,4-O-tetraisopropyldisiloxan-1,3-diyl-β-D-glucopyranosyl>-2-desoxy-α-D-glucopyranosid 在
4 A molecular sieve 、 mercury dibromide 作用下,
生成
methyl-4,5,7,8-tetra-O-acetyl-2,6-anhydro-2,3-dideoxy-D-manno-oct-2-enosonat 、