Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The bifunctional reagent bis(benzotriazolyl)-2-bromoethylphosphonate has been used successfully for the preparation of 2-amino-, 2-N-methylamino- and 2-N-dimethylaminoethylphosphonates of methyl 2,3,4-tri-O-benzoyl-β-D-galactopyranoside.