acetyl 2,4-O-diacetyl-3-O-(2,3,4,6-O-tetraacetyl-α-D-mannopyranosyl)-6-O-(2,3,4,6-O-tetraacetyl-α-D-mannopyranosyl)-β-D-mannopyranoside   、                                                                                      
acetyl 2,4-O-diacetyl-3-O-(2,3,4,6-O-tetraacetyl-α-D-mannopyranosyl)-6-O-(2,3,4,6-O-tetraacetyl-α-D-mannopyranosyl)-α-D-mannopyranoside                                                                                                                                                              在
                                                                                                                                                                                 
氢溴酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷   、                                                                                         
溶剂黄146                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以90%的产率得到2,4-di-O-acetyl-3,6-bis-O-(2,3,4,6-tetra-O-acetyl-α-D-mannopyranoside)-α-D-mannopyranosyl bromide