(2-Hydroxyethyl)ammonium lactates have been prepared by reactions of the corresponding (2-hydroxyethyl) amines with lactic acid and characterized by their 1H NMR, IR, and mass spectra. They have been quantita- tively ...(2-Hydroxyethyl)ammonium lactates have been prepared by reactions of the corresponding (2-hydroxyethyl) amines with lactic acid and characterized by their 1H NMR, IR, and mass spectra. They have been quantita- tively analyzed by HPLC, and their water contents have been determined by the Karl-Fischer method. The title salts are low-melting solids or viscous liquids, and they belong to the class of polar, hydrophilic ionic liquids. The toxicity and chemical and biological degradation of the synthesized ionic liquids have been evaluated by methods described in European Standards. The measurements showed these ionic liquids to be highly biodegradable and only slightly toxic substances. Condensation reactions of benzaldehyde with ethyl cyanoacetate and with acetophenone have been performed in these materials as solvents. The possibility of simultaneously applying these ionic liquids as both solvents and catalysts for the mentioned reactions has been demonstrated, as well as repeated use of the same ionic liquid for a number of condensation reactions without any purification.展开更多
A facile synthesis of trans isomers of 4-aryl-3-methyl-6-oxo-4,5,6,7-tetrahydro-2H-pyrazolo[3,4-b]pyridine-5- carbonitriles via three-component condensation reaction of an aldehyde, 3-amino-5-methylpyrazole and ethyl ...A facile synthesis of trans isomers of 4-aryl-3-methyl-6-oxo-4,5,6,7-tetrahydro-2H-pyrazolo[3,4-b]pyridine-5- carbonitriles via three-component condensation reaction of an aldehyde, 3-amino-5-methylpyrazole and ethyl cyanoacetate in acetonitrile has been developed under microwave irradiation. This one-pot reaction proceeds with-out any catalyst in short times and gives the product in high selectivities and high yields.展开更多
Single wall carbon nanotube (SWNT) was prepared by d.c. arc discharge method and purified by filtration method. After refluxed in HNO 3, the ends of SWNT were opened and oxidized into carboxylate group, which may reac...Single wall carbon nanotube (SWNT) was prepared by d.c. arc discharge method and purified by filtration method. After refluxed in HNO 3, the ends of SWNT were opened and oxidized into carboxylate group, which may react with other reagents. For chemical modification of SWNT, the carboxyl terminated SWNT reacted with CH 3(CH 2) 15 NH 2 with the aid of the condensation agent DCC to obtain the derivatives of SWNT with the amido alkyl chain which enhanced the solubility of SWNT in organic solvent. The results of micro IR prove the formation of amido group in SWNT sample(\{ (CO)=\}1 647 cm -1 ). The FT Raman results show that SWNT sample preserve its structure after the condensation reaction( ω r=181 cm -1 ). [WT5HZ]展开更多
文摘(2-Hydroxyethyl)ammonium lactates have been prepared by reactions of the corresponding (2-hydroxyethyl) amines with lactic acid and characterized by their 1H NMR, IR, and mass spectra. They have been quantita- tively analyzed by HPLC, and their water contents have been determined by the Karl-Fischer method. The title salts are low-melting solids or viscous liquids, and they belong to the class of polar, hydrophilic ionic liquids. The toxicity and chemical and biological degradation of the synthesized ionic liquids have been evaluated by methods described in European Standards. The measurements showed these ionic liquids to be highly biodegradable and only slightly toxic substances. Condensation reactions of benzaldehyde with ethyl cyanoacetate and with acetophenone have been performed in these materials as solvents. The possibility of simultaneously applying these ionic liquids as both solvents and catalysts for the mentioned reactions has been demonstrated, as well as repeated use of the same ionic liquid for a number of condensation reactions without any purification.
文摘A facile synthesis of trans isomers of 4-aryl-3-methyl-6-oxo-4,5,6,7-tetrahydro-2H-pyrazolo[3,4-b]pyridine-5- carbonitriles via three-component condensation reaction of an aldehyde, 3-amino-5-methylpyrazole and ethyl cyanoacetate in acetonitrile has been developed under microwave irradiation. This one-pot reaction proceeds with-out any catalyst in short times and gives the product in high selectivities and high yields.
文摘Single wall carbon nanotube (SWNT) was prepared by d.c. arc discharge method and purified by filtration method. After refluxed in HNO 3, the ends of SWNT were opened and oxidized into carboxylate group, which may react with other reagents. For chemical modification of SWNT, the carboxyl terminated SWNT reacted with CH 3(CH 2) 15 NH 2 with the aid of the condensation agent DCC to obtain the derivatives of SWNT with the amido alkyl chain which enhanced the solubility of SWNT in organic solvent. The results of micro IR prove the formation of amido group in SWNT sample(\{ (CO)=\}1 647 cm -1 ). The FT Raman results show that SWNT sample preserve its structure after the condensation reaction( ω r=181 cm -1 ). [WT5HZ]
