crystalline 2,3,6-tri-o-benzoyl-4-o- ( bromoacetyl ) -alpha-d-galactopyranosyl chloride ( 5 ) was prepared from methyl 2,3,6-tri-o-benzoyl-4-o- ( bromoacetyl ) -alpha- or -beta-d-galactopyranoside by cleavage with dichloromethyl methyl ether ( dcmme ) in the presence of zinc chloride .
C0008203
chloride
C0078774
zinc