Cerium trichloride heptahydrate(CeCl_3·7H_2O) was found to be an efficient and recyclable catalyst for the three-component direct Mannich reaction of anilines and benzaldehydes with acetophenone.This protocol has...Cerium trichloride heptahydrate(CeCl_3·7H_2O) was found to be an efficient and recyclable catalyst for the three-component direct Mannich reaction of anilines and benzaldehydes with acetophenone.This protocol has advantages of high yield,no environmental pollution,mild condition,and simple work-up procedure.展开更多
Michael addition of indole and pyrrole to a variety of α, β-unsaturated ketones was efficiently promoted by a catalytic amount of GaCl3 in aqueous media to afford the corresponding products in good to excellent yields.
Silica gel supported aluminium trichloride（SiO2-AlCl3） has been shown to be a mild,efficient,and chemoseiective heterogeneous Lewis acid catalyst for the acylation of aromatic compounds with acid chlorides.The catal...Silica gel supported aluminium trichloride（SiO2-AlCl3） has been shown to be a mild,efficient,and chemoseiective heterogeneous Lewis acid catalyst for the acylation of aromatic compounds with acid chlorides.The catalyst can be reused up to five times after simple washing with ether and is stable（as a bench top catalyst）.展开更多
A novel treatment process of lead anode slime bearing high antimony and low silver was developed by a potential-controlled chloridization leaching and continuous distillation.The experimental results show a high Sb 3+...A novel treatment process of lead anode slime bearing high antimony and low silver was developed by a potential-controlled chloridization leaching and continuous distillation.The experimental results show a high Sb 3+ concentration,489.2 g/L,in the leaching solution for two-stage countercurrent leaching process,and the leaching rates of Sb,Cu,Bi more than 99% when the potential is controlled at 450 mV.When the leaching solution is distillated and concentrated at 120°C,almost all the silicon compound is evaporated into the concentration distillate and exists as amorphous hydrated silica.By the continuous distillation,high pure SbCl3 could be prepared,and AsCl3 is enriched in the distillate while metals Bi,Cu are enriched in the continuous distillation residue.As a result,the recovery rate of Sb is more than 95%.展开更多
A boron-silicon film was formed from boron trichloride gas and dichlorosilane gas at about 900℃in ambient hydrogen at atmospheric pressure utilizing a slim vertical cold wall chemical vapor deposition reacto...A boron-silicon film was formed from boron trichloride gas and dichlorosilane gas at about 900℃in ambient hydrogen at atmospheric pressure utilizing a slim vertical cold wall chemical vapor deposition reactor designed for the Minimal Fab system. The gas flow rates were 80, 20 and 0.1 - 20 sccm for the hydrogen, dichlorosilane and boron trichloride gases, respectively. The gas transport condition in the reactor was shown to quickly become stable when evaluated by quartz crystal microbalances at the inlet and outlet. The boron-silicon thin film was formed by achieving the various boron concentrations of 0.16% - 80%, the depth profile of which was flat. By observing the cross-sectional TEM image, the obtained film was dense. The boron trichloride gas is expected to be useful for the quick fabrication of various materials containing boron at significantly low and high concentrations.展开更多
Xanthenedione derivatives were prepared through lnCl3·4H2O promoted condensation of aldehydes with 5, 5-dimethyl-1, 3-cyclohexandione in [bmiml[BF4]. The advantages of this method are: simple operation, environme...Xanthenedione derivatives were prepared through lnCl3·4H2O promoted condensation of aldehydes with 5, 5-dimethyl-1, 3-cyclohexandione in [bmiml[BF4]. The advantages of this method are: simple operation, environmental benign and high efficiency. Moreover, the reaction media and the catalyst can be recovered and reused effectively for at least six times.展开更多
4-Aryl/alkyl-3,4-dihydro-2(1H)-pyrimidone esters and 5-acetyl-4-aryl/or alkyl-6-methyl- 3, 4-dihydropyrimidin-2(l)-ones were synthesised efficientiy using montmorillonite clay- SmCl3 6H2O system promoted by microwave ...4-Aryl/alkyl-3,4-dihydro-2(1H)-pyrimidone esters and 5-acetyl-4-aryl/or alkyl-6-methyl- 3, 4-dihydropyrimidin-2(l)-ones were synthesised efficientiy using montmorillonite clay- SmCl3 6H2O system promoted by microwave irradiation in solvenfless condition.展开更多
The mechanism of rare earth metals (Gd and Dy) chloride complexes electroreduction on the tungsten electrode in equimolar NaCl-KCl melt at 973 K has been studied by linear and cyclic voltammetry. Some kinetic paramete...The mechanism of rare earth metals (Gd and Dy) chloride complexes electroreduction on the tungsten electrode in equimolar NaCl-KCl melt at 973 K has been studied by linear and cyclic voltammetry. Some kinetic parameters of processes were calculated. It was shown that the tungsten electrode was indifferent to gadolinium and dysprosium which were reduced on the surface. We found that the discharge mechanism of gadolinium and dysprosium chloride complexes was described by three-electron step when the steady-state conditions of polarization were limited by the mass transfer stage. The conditions of nonstationary polarization made the slowness of the charge transfer stage. The diffusion coefficient of gadolinium and dysprosium ions was calculated, the diffusion coefficient of GdCl3-6 ions was (0.9 ± 0.2) × 10-5 cm2.s-1, and for DYCI3-6 ions, it was (1.60 ± 0.2) × 10-5 сm2.s-1.展开更多
A rapid and facile preparation of benzo-[b]-pyran derivatives through condensation of chalcone and 5, 5-dimethyl-1,3-cyclohexandione under microwave irradiation in the presence of catalytic amount of InCl3·4H2O h...A rapid and facile preparation of benzo-[b]-pyran derivatives through condensation of chalcone and 5, 5-dimethyl-1,3-cyclohexandione under microwave irradiation in the presence of catalytic amount of InCl3·4H2O has been developed. With its high efficiency, operational simplicity and environmental benignancy, this method may provide a useful alternative for the preparation of benzo-[b]-pyran derivatives.展开更多
Simple, efficient and convenient synthesis of aminomethylene bisphsophonic acid derivatives in one-pot reaction using aldehydes, hydroxylamine hydrochloride, phosphours trichloride and water as starting materials in t...Simple, efficient and convenient synthesis of aminomethylene bisphsophonic acid derivatives in one-pot reaction using aldehydes, hydroxylamine hydrochloride, phosphours trichloride and water as starting materials in the presence of pyridine was described.展开更多
An acceptor-free catalysis protocol for the deoximation of ketoximes and aldoximes using RuCl3 as the catalyst has been developed. Under the optimized conditions, various oximes were converted to ketones and nitriles ...An acceptor-free catalysis protocol for the deoximation of ketoximes and aldoximes using RuCl3 as the catalyst has been developed. Under the optimized conditions, various oximes were converted to ketones and nitriles with excellent isolated yields.展开更多
Herein lies a convenient and highly efficient method of olefin isomerization in the presence of RuCl3？3H2O in ionic liquid（IL）. More importantly, RuCl3？3H2O is a robust and recyclable catalyst. Nine cycles of RuCl...Herein lies a convenient and highly efficient method of olefin isomerization in the presence of RuCl3？3H2O in ionic liquid（IL）. More importantly, RuCl3？3H2O is a robust and recyclable catalyst. Nine cycles of RuCl3？3H2O as the catalyst were performed for the isomerization reactions of the selected substrate in IL and MeOH.展开更多
A simple synthesis of medicinally important cis-2-methyl-4-azapan-2-one-1,2,3,4-tetrahydroquinolines/cis-9- （2-methyl-l,2,3,4-tetrahydroquinolin-4-yl）-9H-carbazole was reported. Multicomponent one pot synthesis with...A simple synthesis of medicinally important cis-2-methyl-4-azapan-2-one-1,2,3,4-tetrahydroquinolines/cis-9- （2-methyl-l,2,3,4-tetrahydroquinolin-4-yl）-9H-carbazole was reported. Multicomponent one pot synthesis with ani- lines and N-vinylcaprolactam/N-vinyl carbazole via imino Diels-Alder reaction by using antimony trichloride as catalyst and acetonitrile as solvent was employed. NMR technique （2D） was used to study the regio- and stereo- chemistry of newly synthesized compounds. The cis diastereo-selectivity of the products was predicted by COSY and NOESY studies.展开更多
Active metal bismuth is produced in situ via Sin/BiCl_3, system in aqueous media. Promoted by this active species. β-aminoesters and α-selenoesters are synthesized via reaction of α-bromoesters with 1 -(α-aminoalk...Active metal bismuth is produced in situ via Sin/BiCl_3, system in aqueous media. Promoted by this active species. β-aminoesters and α-selenoesters are synthesized via reaction of α-bromoesters with 1 -(α-aminoalkyl ) benzotriazole and diselenides in moderate to good yields.展开更多
A new method for preparation of N-tosylimines by InCl_3-mediated condensation of aldehydes with p-toluenesulfonamide in refluxing benzene is reported.The procedure is lauded by its simplicity,mild reaction conditions,...A new method for preparation of N-tosylimines by InCl_3-mediated condensation of aldehydes with p-toluenesulfonamide in refluxing benzene is reported.The procedure is lauded by its simplicity,mild reaction conditions,excellent yields and adaptability to electron deficient and electron rich aromatic,andα,β-unsaturated aldehydes.展开更多
The derivatives of β-alkoxycarbonylethyltin trichlorides with diethyldithiocarbamate,ROCOCH2CH2Sn(S2CNEt2)Cl2, were synthesized and characterized by the means of elemental analysis, IR, 1H NMR and X-ray single crysta...The derivatives of β-alkoxycarbonylethyltin trichlorides with diethyldithiocarbamate,ROCOCH2CH2Sn(S2CNEt2)Cl2, were synthesized and characterized by the means of elemental analysis, IR, 1H NMR and X-ray single crystal diffraction. The structural features of the compounds were described, and the possible mechanism of transesterification for compound 2a was suggested.展开更多
The reaction of amino acids and phosphorus trichloride in THF was studied by 31P NMR tracing and ESI-MS/MS. A series of hydridophoranes and cyclic dipeptides were obtained. The reaction presented interesting diversity...The reaction of amino acids and phosphorus trichloride in THF was studied by 31P NMR tracing and ESI-MS/MS. A series of hydridophoranes and cyclic dipeptides were obtained. The reaction presented interesting diversity and the reaction mechanism was proposed. The mechanism suggests that phosphorus plays an important role in the synthesis of amino acid hydridophorane and cyclic dipeptides. The results also show that 31P NMR and ESI-MS/MS are useful tools for the investigation of reaction mechanism.展开更多
α-Selenoesters and α-thiolesters are synthesized via reactions of α-bromoesters with diselenides and disulfides promoted by Sm/SbCl3 system in aqueous media in moderate to good yields.
基金the financial support from Nanjing University of Science and Technology.
文摘Cerium trichloride heptahydrate(CeCl_3·7H_2O) was found to be an efficient and recyclable catalyst for the three-component direct Mannich reaction of anilines and benzaldehydes with acetophenone.This protocol has advantages of high yield,no environmental pollution,mild condition,and simple work-up procedure.
基金support by the Natural Science Foundation of Zhejiang Province(No.Y4051137,Y405015 and Y4080177)
文摘Michael addition of indole and pyrrole to a variety of α, β-unsaturated ketones was efficiently promoted by a catalytic amount of GaCl3 in aqueous media to afford the corresponding products in good to excellent yields.
文摘Silica gel supported aluminium trichloride（SiO2-AlCl3） has been shown to be a mild,efficient,and chemoseiective heterogeneous Lewis acid catalyst for the acylation of aromatic compounds with acid chlorides.The catalyst can be reused up to five times after simple washing with ether and is stable（as a bench top catalyst）.
基金Project(2006BAB02B04-4-1)supported by the National Science and Technology Pillar Program during the 11th Five-Year Plan Period,China
文摘A novel treatment process of lead anode slime bearing high antimony and low silver was developed by a potential-controlled chloridization leaching and continuous distillation.The experimental results show a high Sb 3+ concentration,489.2 g/L,in the leaching solution for two-stage countercurrent leaching process,and the leaching rates of Sb,Cu,Bi more than 99% when the potential is controlled at 450 mV.When the leaching solution is distillated and concentrated at 120°C,almost all the silicon compound is evaporated into the concentration distillate and exists as amorphous hydrated silica.By the continuous distillation,high pure SbCl3 could be prepared,and AsCl3 is enriched in the distillate while metals Bi,Cu are enriched in the continuous distillation residue.As a result,the recovery rate of Sb is more than 95%.
文摘A boron-silicon film was formed from boron trichloride gas and dichlorosilane gas at about 900℃in ambient hydrogen at atmospheric pressure utilizing a slim vertical cold wall chemical vapor deposition reactor designed for the Minimal Fab system. The gas flow rates were 80, 20 and 0.1 - 20 sccm for the hydrogen, dichlorosilane and boron trichloride gases, respectively. The gas transport condition in the reactor was shown to quickly become stable when evaluated by quartz crystal microbalances at the inlet and outlet. The boron-silicon thin film was formed by achieving the various boron concentrations of 0.16% - 80%, the depth profile of which was flat. By observing the cross-sectional TEM image, the obtained film was dense. The boron trichloride gas is expected to be useful for the quick fabrication of various materials containing boron at significantly low and high concentrations.
基金This work was financially supported by the National Natural Science Foundation of China(No.20273019)the Science Foundation of Henan Normal University for Young Scholars(No.0307032).
文摘Xanthenedione derivatives were prepared through lnCl3·4H2O promoted condensation of aldehydes with 5, 5-dimethyl-1, 3-cyclohexandione in [bmiml[BF4]. The advantages of this method are: simple operation, environmental benign and high efficiency. Moreover, the reaction media and the catalyst can be recovered and reused effectively for at least six times.
文摘4-Aryl/alkyl-3,4-dihydro-2(1H)-pyrimidone esters and 5-acetyl-4-aryl/or alkyl-6-methyl- 3, 4-dihydropyrimidin-2(l)-ones were synthesised efficientiy using montmorillonite clay- SmCl3 6H2O system promoted by microwave irradiation in solvenfless condition.
文摘The mechanism of rare earth metals (Gd and Dy) chloride complexes electroreduction on the tungsten electrode in equimolar NaCl-KCl melt at 973 K has been studied by linear and cyclic voltammetry. Some kinetic parameters of processes were calculated. It was shown that the tungsten electrode was indifferent to gadolinium and dysprosium which were reduced on the surface. We found that the discharge mechanism of gadolinium and dysprosium chloride complexes was described by three-electron step when the steady-state conditions of polarization were limited by the mass transfer stage. The conditions of nonstationary polarization made the slowness of the charge transfer stage. The diffusion coefficient of gadolinium and dysprosium ions was calculated, the diffusion coefficient of GdCl3-6 ions was (0.9 ± 0.2) × 10-5 cm2.s-1, and for DYCI3-6 ions, it was (1.60 ± 0.2) × 10-5 сm2.s-1.
基金This work was financially supported by the National Natural Science Foundation of China(No.20372018)the Science Foundation of Henan Normal University for Young Scholars(No.0307032).
文摘A rapid and facile preparation of benzo-[b]-pyran derivatives through condensation of chalcone and 5, 5-dimethyl-1,3-cyclohexandione under microwave irradiation in the presence of catalytic amount of InCl3·4H2O has been developed. With its high efficiency, operational simplicity and environmental benignancy, this method may provide a useful alternative for the preparation of benzo-[b]-pyran derivatives.
文摘Simple, efficient and convenient synthesis of aminomethylene bisphsophonic acid derivatives in one-pot reaction using aldehydes, hydroxylamine hydrochloride, phosphours trichloride and water as starting materials in the presence of pyridine was described.
基金Financial support from the National Natural Science Foundation of China （No. 21072055） and the National High Technology Research and Development Program of China （863 Program） （No. 2008AA06Z306）.
文摘An acceptor-free catalysis protocol for the deoximation of ketoximes and aldoximes using RuCl3 as the catalyst has been developed. Under the optimized conditions, various oximes were converted to ketones and nitriles with excellent isolated yields.
基金Supported by the National Natural Science Foundation of China(Nos.21072149, 20872108)
文摘Herein lies a convenient and highly efficient method of olefin isomerization in the presence of RuCl3？3H2O in ionic liquid（IL）. More importantly, RuCl3？3H2O is a robust and recyclable catalyst. Nine cycles of RuCl3？3H2O as the catalyst were performed for the isomerization reactions of the selected substrate in IL and MeOH.
文摘A simple synthesis of medicinally important cis-2-methyl-4-azapan-2-one-1,2,3,4-tetrahydroquinolines/cis-9- （2-methyl-l,2,3,4-tetrahydroquinolin-4-yl）-9H-carbazole was reported. Multicomponent one pot synthesis with ani- lines and N-vinylcaprolactam/N-vinyl carbazole via imino Diels-Alder reaction by using antimony trichloride as catalyst and acetonitrile as solvent was employed. NMR technique （2D） was used to study the regio- and stereo- chemistry of newly synthesized compounds. The cis diastereo-selectivity of the products was predicted by COSY and NOESY studies.
基金the National Natural Science Foundation of China ! 29872010,294938004NSF of Zhe-hang province, China and the Laboratory of O
文摘Active metal bismuth is produced in situ via Sin/BiCl_3, system in aqueous media. Promoted by this active species. β-aminoesters and α-selenoesters are synthesized via reaction of α-bromoesters with 1 -(α-aminoalkyl ) benzotriazole and diselenides in moderate to good yields.
文摘A new method for preparation of N-tosylimines by InCl_3-mediated condensation of aldehydes with p-toluenesulfonamide in refluxing benzene is reported.The procedure is lauded by its simplicity,mild reaction conditions,excellent yields and adaptability to electron deficient and electron rich aromatic,andα,β-unsaturated aldehydes.
文摘The derivatives of β-alkoxycarbonylethyltin trichlorides with diethyldithiocarbamate,ROCOCH2CH2Sn(S2CNEt2)Cl2, were synthesized and characterized by the means of elemental analysis, IR, 1H NMR and X-ray single crystal diffraction. The structural features of the compounds were described, and the possible mechanism of transesterification for compound 2a was suggested.
基金Project supported by the National Natural Science Foundation of China （Nos. 20672104, 20732004）
文摘The reaction of amino acids and phosphorus trichloride in THF was studied by 31P NMR tracing and ESI-MS/MS. A series of hydridophoranes and cyclic dipeptides were obtained. The reaction presented interesting diversity and the reaction mechanism was proposed. The mechanism suggests that phosphorus plays an important role in the synthesis of amino acid hydridophorane and cyclic dipeptides. The results also show that 31P NMR and ESI-MS/MS are useful tools for the investigation of reaction mechanism.
文摘α-Selenoesters and α-thiolesters are synthesized via reactions of α-bromoesters with diselenides and disulfides promoted by Sm/SbCl3 system in aqueous media in moderate to good yields.
