Hydrophilic hyperbranched poly(ester-amine) (HPEA) synthesized from diethanolamine and methyl acrylate was used as phase transfer agent for the first time to transfer methyl orange (MO) from water into chloroform. Thi...Hydrophilic hyperbranched poly(ester-amine) (HPEA) synthesized from diethanolamine and methyl acrylate was used as phase transfer agent for the first time to transfer methyl orange (MO) from water into chloroform. This process was quantified by UV-Vis spectra. A possible mechanism was put forward based on the formation of amphiphilic aggregates.展开更多
This article presents a novel catalytic method by combining phase-transfer catalyst, benzyltriethylammonium chloride, with 4-dimethylaminopyridine for the syntheses of glycosyl esters from substituted phenoxyaeetie ac...This article presents a novel catalytic method by combining phase-transfer catalyst, benzyltriethylammonium chloride, with 4-dimethylaminopyridine for the syntheses of glycosyl esters from substituted phenoxyaeetie acids and the peracetate of α-D-l-bromosugars to produee eight novel β-glyeosyl esters in high yields. The struetures of the syn-thesized eompounds were established by IR, MS, ^1H NMR, and ^13C NMR speetra and elemental analyses.展开更多
Hyperbranched poly(ester-amine) with terminal amine groups was synthesized by Michael addition reaction between trimethylolpropanetriacrylate (B 3 monomer) and pizine (A 2 monomer) under molar ratio of 6∶13 via a one...Hyperbranched poly(ester-amine) with terminal amine groups was synthesized by Michael addition reaction between trimethylolpropanetriacrylate (B 3 monomer) and pizine (A 2 monomer) under molar ratio of 6∶13 via a one-step procedure.It was further modified by stearyl chloride to form an amphiphilic hyperbranched polymer.The structures of these polymers were characterized by FT-IR,{}+1H-NMR,DSC and GPC analyses.Due to the existence of interior secondary amines,the modified polymer can be used as phase transferring agent to extract methylic orange from water layer to CHCl-3 layer.Both higher transferring capability and higher transferring rate were achieved at lower pH of the water phase.The extracted dye in the organic layer can be further released to the water layer under a basic condition.A possible mechanism for extracting dye by amphiphilic hyperbranched polymer was suggested.展开更多
This paper reports that four new glycosyl esters of Vanillic Acid were synthesized by the reaction of vanillic acid with O-acetylglucopyranosyl bromide or O-acetylgalacopyranosyl bromide,O-acetylxylopyranosyl bromide ...This paper reports that four new glycosyl esters of Vanillic Acid were synthesized by the reaction of vanillic acid with O-acetylglucopyranosyl bromide or O-acetylgalacopyranosyl bromide,O-acetylxylopyranosyl bromide and O-acetyllactosyl bromide in the presence of Ag2O respectively;and vanillic acid-4-β-D-2’,3’,4’,6’-acetyl glucoside-β-D-2",3",4",6"-acetyl glucoester by vanillic acid with O-acetylglucopyranosyl bromide in the presence of Bu4NBr.Their structures were confirmed by IR,1H NMR,13C NMR,HMBC and MS.And spectra data proved that the products are of β-configuration.展开更多
Six aromatic acid esters of heptaacetyl maltosyl were synthesized by reaction of hepta-O-acetyl-α-maltosyl bromide with corresponding aromatic acids, using triethyl benzyl ammonium chloride as a phase -transfer catal...Six aromatic acid esters of heptaacetyl maltosyl were synthesized by reaction of hepta-O-acetyl-α-maltosyl bromide with corresponding aromatic acids, using triethyl benzyl ammonium chloride as a phase -transfer catalyst. In the 1 H NMR spectra of these compounds, the che mical shift of C 1 -H in glycosyl-ring appears at downfield, the coupling constant J 1-2 =8 0～8 3. In the IR spectra of the products, the abso r ption of bending vibration of C 1 -H bond in glycosyl-ring appears at abou t 900 cm -1 . The IR, 1 H NMR spectra confirmed their β-anome r configuration. The greater relative abundances of the molecular ion peak were recorded in the mass spectra of the products. The method has advantages of mild reaction conditions, easy separation and high stereospecifi- city of the pro ducts.展开更多
Four glucosyl esters(a～d) of cinnamic acid were synthesized by the reaction of cinnamic acid with O-acetylglucopyranosyl bromide,O-acetylgalactopyranosyl bromide,O-acetylxylopyranosyl bromide and O-acetylmaltopyranos...Four glucosyl esters(a～d) of cinnamic acid were synthesized by the reaction of cinnamic acid with O-acetylglucopyranosyl bromide,O-acetylgalactopyranosyl bromide,O-acetylxylopyranosyl bromide and O-acetylmaltopyranosyl bromide in the presence of Bu4NBr(c and d were new compounds).Their structures were confirmed by IR,1HNMR,MS and elemental analysis.The 1HNMR and IR spectra showed that they were β-isomers.展开更多
文摘Hydrophilic hyperbranched poly(ester-amine) (HPEA) synthesized from diethanolamine and methyl acrylate was used as phase transfer agent for the first time to transfer methyl orange (MO) from water into chloroform. This process was quantified by UV-Vis spectra. A possible mechanism was put forward based on the formation of amphiphilic aggregates.
基金Supported by the National Natural Science Foundation of China(No.20674023).
文摘This article presents a novel catalytic method by combining phase-transfer catalyst, benzyltriethylammonium chloride, with 4-dimethylaminopyridine for the syntheses of glycosyl esters from substituted phenoxyaeetie acids and the peracetate of α-D-l-bromosugars to produee eight novel β-glyeosyl esters in high yields. The struetures of the syn-thesized eompounds were established by IR, MS, ^1H NMR, and ^13C NMR speetra and elemental analyses.
文摘Hyperbranched poly(ester-amine) with terminal amine groups was synthesized by Michael addition reaction between trimethylolpropanetriacrylate (B 3 monomer) and pizine (A 2 monomer) under molar ratio of 6∶13 via a one-step procedure.It was further modified by stearyl chloride to form an amphiphilic hyperbranched polymer.The structures of these polymers were characterized by FT-IR,{}+1H-NMR,DSC and GPC analyses.Due to the existence of interior secondary amines,the modified polymer can be used as phase transferring agent to extract methylic orange from water layer to CHCl-3 layer.Both higher transferring capability and higher transferring rate were achieved at lower pH of the water phase.The extracted dye in the organic layer can be further released to the water layer under a basic condition.A possible mechanism for extracting dye by amphiphilic hyperbranched polymer was suggested.
文摘This paper reports that four new glycosyl esters of Vanillic Acid were synthesized by the reaction of vanillic acid with O-acetylglucopyranosyl bromide or O-acetylgalacopyranosyl bromide,O-acetylxylopyranosyl bromide and O-acetyllactosyl bromide in the presence of Ag2O respectively;and vanillic acid-4-β-D-2’,3’,4’,6’-acetyl glucoside-β-D-2",3",4",6"-acetyl glucoester by vanillic acid with O-acetylglucopyranosyl bromide in the presence of Bu4NBr.Their structures were confirmed by IR,1H NMR,13C NMR,HMBC and MS.And spectra data proved that the products are of β-configuration.
文摘Six aromatic acid esters of heptaacetyl maltosyl were synthesized by reaction of hepta-O-acetyl-α-maltosyl bromide with corresponding aromatic acids, using triethyl benzyl ammonium chloride as a phase -transfer catalyst. In the 1 H NMR spectra of these compounds, the che mical shift of C 1 -H in glycosyl-ring appears at downfield, the coupling constant J 1-2 =8 0～8 3. In the IR spectra of the products, the abso r ption of bending vibration of C 1 -H bond in glycosyl-ring appears at abou t 900 cm -1 . The IR, 1 H NMR spectra confirmed their β-anome r configuration. The greater relative abundances of the molecular ion peak were recorded in the mass spectra of the products. The method has advantages of mild reaction conditions, easy separation and high stereospecifi- city of the pro ducts.
文摘Four glucosyl esters(a～d) of cinnamic acid were synthesized by the reaction of cinnamic acid with O-acetylglucopyranosyl bromide,O-acetylgalactopyranosyl bromide,O-acetylxylopyranosyl bromide and O-acetylmaltopyranosyl bromide in the presence of Bu4NBr(c and d were new compounds).Their structures were confirmed by IR,1HNMR,MS and elemental analysis.The 1HNMR and IR spectra showed that they were β-isomers.
