di-O-acetyl-4-O-(2, 3, 4, 6-tetra-O-acetyl-b-D-galactopyranosyl)-2-azido-2-deoxy- b-D-glucoppyranosyl nitrate could be separated from its mannose type isomer by glycosylation according to the reactivity difference of ...di-O-acetyl-4-O-(2, 3, 4, 6-tetra-O-acetyl-b-D-galactopyranosyl)-2-azido-2-deoxy- b-D-glucoppyranosyl nitrate could be separated from its mannose type isomer by glycosylation according to the reactivity difference of these two compounds. The pure glucose type nitrate can be converted to corresponding trichloroacemidate, which reacted with spacer arms in solution of CH2Cl2 with BF3稥t2O as promoters to give desired glycosides and dimers.展开更多
Two kinds of new chelating resins containing heterocyclic functional group(1-amino-5-methylthio-1,3,4-thia-dizole) were synthesized from macroporous chloromethylated polystyrene.Their structures were characfterized by...Two kinds of new chelating resins containing heterocyclic functional group(1-amino-5-methylthio-1,3,4-thia-dizole) were synthesized from macroporous chloromethylated polystyrene.Their structures were characfterized by elemental analysisand infrared spectra.Their adsorption properties for Cu2 +,Pb2 +,Ni2 +,Zn2 +,Ag+and Hg2 +had been studied.The results showthatthe newly synthesized resins have highly selective for Ag+and Hg2 +and the resin has no affinity for Cu2 +、Pb2 +and Ni2 +.The in-troduction of hydrophilic polyvinyl alcohol spacer arm can increase the adsorption capacity and the length of spacer arm has effecton the adsorption capacities.展开更多
基金supported by the National Natural Science Foundation of China(NNSFC)a grant from the Ministry of Science and Technology
文摘di-O-acetyl-4-O-(2, 3, 4, 6-tetra-O-acetyl-b-D-galactopyranosyl)-2-azido-2-deoxy- b-D-glucoppyranosyl nitrate could be separated from its mannose type isomer by glycosylation according to the reactivity difference of these two compounds. The pure glucose type nitrate can be converted to corresponding trichloroacemidate, which reacted with spacer arms in solution of CH2Cl2 with BF3稥t2O as promoters to give desired glycosides and dimers.
文摘Two kinds of new chelating resins containing heterocyclic functional group(1-amino-5-methylthio-1,3,4-thia-dizole) were synthesized from macroporous chloromethylated polystyrene.Their structures were characfterized by elemental analysisand infrared spectra.Their adsorption properties for Cu2 +,Pb2 +,Ni2 +,Zn2 +,Ag+and Hg2 +had been studied.The results showthatthe newly synthesized resins have highly selective for Ag+and Hg2 +and the resin has no affinity for Cu2 +、Pb2 +and Ni2 +.The in-troduction of hydrophilic polyvinyl alcohol spacer arm can increase the adsorption capacity and the length of spacer arm has effecton the adsorption capacities.
