A microwave-accelerated Suzuki coupling procedure was developed via guanidinium ionic liquids（GILs） stabilized Pd-micelle.The Pd micelle/GILs play a key role in enhancing the activity,due to the highly dispersed Pd ...A microwave-accelerated Suzuki coupling procedure was developed via guanidinium ionic liquids（GILs） stabilized Pd-micelle.The Pd micelle/GILs play a key role in enhancing the activity,due to the highly dispersed Pd active sites and the phase transfer function of GILs,which ensures the adsorption of reactants and facilitates the translation of the intermediates to the surface of the micelle.展开更多
Curcumin 3,4-dihydropyrimidinones/thiones/imines have been synthesized using one-pot cyclocondensation of curcumin with substituted aromatic aldehydes and urea/thiourea/guanidine in the presence of chitosamine hydroch...Curcumin 3,4-dihydropyrimidinones/thiones/imines have been synthesized using one-pot cyclocondensation of curcumin with substituted aromatic aldehydes and urea/thiourea/guanidine in the presence of chitosamine hydrochloride as a biodegradable and nontoxic catalyst under solvent-free microwave irradiation.The synthesized product was purified by crystallization from ethanol and the process does not involve any hazardous solvent.All the synthesized curcumin derivatives 4a-o were screened for antioxidant and anti-inflammatory activity.Biological activity data of the synthesized showed that most of the synthesized compounds exhibited greater antioxidant and anti-inflammatory activity than curcumin.展开更多
Oxidation of Xanthine alkaloid have been studied with various one and two electron oxidizing agents using PEGs and micelle forming surfactants. The reaction is too sluggish in solution phase, but moderately fast in pr...Oxidation of Xanthine alkaloid have been studied with various one and two electron oxidizing agents using PEGs and micelle forming surfactants. The reaction is too sluggish in solution phase, but moderately fast in presence of PEGs and micelles. However, the reactions are dramatically enhanced under microwave irradiations. Present protocol has several advantages, such as solvent-free conditions, during work-up, fast reaction times, high yields, eco-friendly operational and experimental simplicity, readily available additives as catalysts.展开更多
以苯甲酸(BA)为第一配体、邻菲罗啉(Phen)为第二配体、铕离子(Eu3+)为中心离子,采用微波辐射的方法制备了含铕荧光配合物,通过元素分析、FT-IR和1 H NMR确定配合物组成为Eu(BA)3Phen,采用TGA、XRD和荧光分光光度计对其性能进行测试分析:...以苯甲酸(BA)为第一配体、邻菲罗啉(Phen)为第二配体、铕离子(Eu3+)为中心离子,采用微波辐射的方法制备了含铕荧光配合物,通过元素分析、FT-IR和1 H NMR确定配合物组成为Eu(BA)3Phen,采用TGA、XRD和荧光分光光度计对其性能进行测试分析:TGA结果表明配合物的起始分解温度为270℃,热稳定性良好;荧光分光光度计和XRD显示荧光性能优异且具有良好的结晶性能;与普通的制备方法相比,极大地缩短了反应时间,显著提高了反应效率.展开更多
基金Supported by the National Natural Science Foundation of China(Nos.20802071,21074133)
文摘A microwave-accelerated Suzuki coupling procedure was developed via guanidinium ionic liquids（GILs） stabilized Pd-micelle.The Pd micelle/GILs play a key role in enhancing the activity,due to the highly dispersed Pd active sites and the phase transfer function of GILs,which ensures the adsorption of reactants and facilitates the translation of the intermediates to the surface of the micelle.
基金the Madhya Pradesh Council of Science and Technology, Bhopal, India for financial support (No. 4468/CST/R&D/2010)
文摘Curcumin 3,4-dihydropyrimidinones/thiones/imines have been synthesized using one-pot cyclocondensation of curcumin with substituted aromatic aldehydes and urea/thiourea/guanidine in the presence of chitosamine hydrochloride as a biodegradable and nontoxic catalyst under solvent-free microwave irradiation.The synthesized product was purified by crystallization from ethanol and the process does not involve any hazardous solvent.All the synthesized curcumin derivatives 4a-o were screened for antioxidant and anti-inflammatory activity.Biological activity data of the synthesized showed that most of the synthesized compounds exhibited greater antioxidant and anti-inflammatory activity than curcumin.
文摘Oxidation of Xanthine alkaloid have been studied with various one and two electron oxidizing agents using PEGs and micelle forming surfactants. The reaction is too sluggish in solution phase, but moderately fast in presence of PEGs and micelles. However, the reactions are dramatically enhanced under microwave irradiations. Present protocol has several advantages, such as solvent-free conditions, during work-up, fast reaction times, high yields, eco-friendly operational and experimental simplicity, readily available additives as catalysts.
文摘以苯甲酸(BA)为第一配体、邻菲罗啉(Phen)为第二配体、铕离子(Eu3+)为中心离子,采用微波辐射的方法制备了含铕荧光配合物,通过元素分析、FT-IR和1 H NMR确定配合物组成为Eu(BA)3Phen,采用TGA、XRD和荧光分光光度计对其性能进行测试分析:TGA结果表明配合物的起始分解温度为270℃,热稳定性良好;荧光分光光度计和XRD显示荧光性能优异且具有良好的结晶性能;与普通的制备方法相比,极大地缩短了反应时间,显著提高了反应效率.
