It is reported in this paper that trace chlorion in synthetic o benzene dimethanol can be determined directly and accurately by the turbidimetric method (as AgCl).The optimum conditions are also studied.Beer’s law is...It is reported in this paper that trace chlorion in synthetic o benzene dimethanol can be determined directly and accurately by the turbidimetric method (as AgCl).The optimum conditions are also studied.Beer’s law is applicable for the determination of trace concentration of chlordeion in the range of 0～5.0μg/mL.The recoveries of the method are found to be in the range 98.30%～101.13% with RSD smaller than 5.0%.The method is simple and rapid.展开更多
Thin layer chromatography was used to separate and analyze the samples in the process of preparation of β d glucopyranose 1 bromo 2 amino 2,3,4,6 tetra acetyl ester.The best developing solvent system is ethyl acetate...Thin layer chromatography was used to separate and analyze the samples in the process of preparation of β d glucopyranose 1 bromo 2 amino 2,3,4,6 tetra acetyl ester.The best developing solvent system is ethyl acetate∶methane alcohol∶water=6∶3∶0.5(V/V).The reactants, inter mediates and products could be separated effectively,thus indicated the reaction progression obviously.展开更多
2acetylamino3,4,6triacetate Dglucopyranose is an important imtermediate in the synthesis of Lipid A analogs.It was synthesized by the regioselective 1Odeacylation of fully acylated sugars.In this paper, ...2acetylamino3,4,6triacetate Dglucopyranose is an important imtermediate in the synthesis of Lipid A analogs.It was synthesized by the regioselective 1Odeacylation of fully acylated sugars.In this paper, the fully acylated aminoglucose was synthesized by a new method.In comparison with the old procedure,the reaction time was shorten ed,yet the yield was still higher.展开更多
文摘It is reported in this paper that trace chlorion in synthetic o benzene dimethanol can be determined directly and accurately by the turbidimetric method (as AgCl).The optimum conditions are also studied.Beer’s law is applicable for the determination of trace concentration of chlordeion in the range of 0～5.0μg/mL.The recoveries of the method are found to be in the range 98.30%～101.13% with RSD smaller than 5.0%.The method is simple and rapid.
文摘Thin layer chromatography was used to separate and analyze the samples in the process of preparation of β d glucopyranose 1 bromo 2 amino 2,3,4,6 tetra acetyl ester.The best developing solvent system is ethyl acetate∶methane alcohol∶water=6∶3∶0.5(V/V).The reactants, inter mediates and products could be separated effectively,thus indicated the reaction progression obviously.
文摘2acetylamino3,4,6triacetate Dglucopyranose is an important imtermediate in the synthesis of Lipid A analogs.It was synthesized by the regioselective 1Odeacylation of fully acylated sugars.In this paper, the fully acylated aminoglucose was synthesized by a new method.In comparison with the old procedure,the reaction time was shorten ed,yet the yield was still higher.
