Limited lithium resources have promoted the exploration of new battery technologies.Among them,potassium-ion batteries are considered as promising alternatives.At present,commercial graphite and other carbon-based mat...Limited lithium resources have promoted the exploration of new battery technologies.Among them,potassium-ion batteries are considered as promising alternatives.At present,commercial graphite and other carbon-based materials have shown good prospects as anodes for potassium-ion batteries.However,the volume expansion and structural collapse caused by periodic K+insertion/extraction have severely restricted further development and application of potassium-ion batteries.A hollow biomass carbon ball(NOP-PB)ternarily doped with N,O,and P was synthesized and used as the negative electrode of a potassium-ion battery.X-ray photoelectron spectroscopy,Fourier‐transform infrared spectroscopy,and transmission electron microscopy confirmed that the hollow biomass carbon spheres were successfully doped with N,O,and P.Further analysis proved that N,O,and P ternary doping expands the interlayer distance of the graphite surface and introduces more defect sites.DFT calculations simultaneously proved that the K adsorption energy of the doped structure is greatly improved.The solid hollow hierarchical porous structure buffers the volume expansion of the potassium insertion process,maintains the original structure after a long cycle and promotes the transfer of potassium ions and electrons.Therefore,the NOP‐PB negative electrode shows extremely enhanced electrochemical performance,including high specific capacity,excellent long‐term stability,and good rate stability.展开更多
3-（Diphenylphosphino）propanoic acid（L2） has proved to be an efficient ligand for the copper-catalyzed C–N coupling reactions.N-arylation of imidazoles with aryl iodides catalyzed by CuCl/L2 was smoothly carried o...3-（Diphenylphosphino）propanoic acid（L2） has proved to be an efficient ligand for the copper-catalyzed C–N coupling reactions.N-arylation of imidazoles with aryl iodides catalyzed by CuCl/L2 was smoothly carried out in DMSO at 100 8C with a yield up to 98%.N-arylation of 1H-pyrazole with aryl iodides and bromides catalyzed by Cu（OAc）2/L2 in 1 4-dioxane also gave the corresponding products with yields of40%–98%.展开更多
A new phosphorylating reagent, N,N-di-isopropyl-O,O-di-p-methoxybenzylphosphoramidite was synthesized from diisopropylamino dichlorophosphine and p-methoxybenzyl alcohol for preparing phosphatydyl inositol polyphospha...A new phosphorylating reagent, N,N-di-isopropyl-O,O-di-p-methoxybenzylphosphoramidite was synthesized from diisopropylamino dichlorophosphine and p-methoxybenzyl alcohol for preparing phosphatydyl inositol polyphosphate particularly with unsaturated components.展开更多
A mild,green,convenient and scalable N-bromosuccinimide(NBS)promoted direct phosphorylation strategy of secondary phosphine oxides and alcohols for the synthesis of various phosphinate esters was developed.A variety o...A mild,green,convenient and scalable N-bromosuccinimide(NBS)promoted direct phosphorylation strategy of secondary phosphine oxides and alcohols for the synthesis of various phosphinate esters was developed.A variety of substrates are well-tolerated and the desirable compounds were afforded in moderate to excellent yields(up to 92%).This reaction is conducted at room temperature without the addition of any oxidant and metal catalyst,which provides a new strategy for the synthesis of phosphinate esters.展开更多
Organic phosphorus compounds containing sp^(3)-C—P(O)bonds are increasingly widely applied in catalysis,pharmaceuticals,materials,pesticides,and other fields,and their synthesis has become a research hotspot in chemi...Organic phosphorus compounds containing sp^(3)-C—P(O)bonds are increasingly widely applied in catalysis,pharmaceuticals,materials,pesticides,and other fields,and their synthesis has become a research hotspot in chemistry.Diarylmethyl phosphine oxides are important organic phosphorus compounds containing sp^(3)-C—P(O)bonds,but their synthesis is limited.Traditional methods for their synthesis require the use of halogenated compounds and harsh reaction conditions.A new method for the copper-mediated synthesis of(diarylmethyl)diarylphosphine oxides has been developed.This method involves the cleavage of the sp^(3)-C—N bond in N-diarylmethylsulfonamides,leading to the formation of diarylmethyl carbocations.The carbocations then react with diarylphosphine oxides to construct sp^(3)-C—P(O)bonds.Our method only requires the addition of stoichiometric,inexpensive CuBr2 and produces a series of target compounds in satisfactory yields.Thus,it provides a convenient,and cost-effective pathway for the synthesis of diarylmethyl phosphine oxides.展开更多
基金The authors are grateful for support from the National Natural Science Foundation of China(No.21671160).
文摘Limited lithium resources have promoted the exploration of new battery technologies.Among them,potassium-ion batteries are considered as promising alternatives.At present,commercial graphite and other carbon-based materials have shown good prospects as anodes for potassium-ion batteries.However,the volume expansion and structural collapse caused by periodic K+insertion/extraction have severely restricted further development and application of potassium-ion batteries.A hollow biomass carbon ball(NOP-PB)ternarily doped with N,O,and P was synthesized and used as the negative electrode of a potassium-ion battery.X-ray photoelectron spectroscopy,Fourier‐transform infrared spectroscopy,and transmission electron microscopy confirmed that the hollow biomass carbon spheres were successfully doped with N,O,and P.Further analysis proved that N,O,and P ternary doping expands the interlayer distance of the graphite surface and introduces more defect sites.DFT calculations simultaneously proved that the K adsorption energy of the doped structure is greatly improved.The solid hollow hierarchical porous structure buffers the volume expansion of the potassium insertion process,maintains the original structure after a long cycle and promotes the transfer of potassium ions and electrons.Therefore,the NOP‐PB negative electrode shows extremely enhanced electrochemical performance,including high specific capacity,excellent long‐term stability,and good rate stability.
基金financial support of this work by the National Basic Research Program of China (973 Program, No. 2012CB722603)the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT1161)+1 种基金the National Natural Science Foundation of China (No. 21103114)the Doctor Foundation of Xinjiang Bingtuan (No. 2012BB010)
文摘3-（Diphenylphosphino）propanoic acid（L2） has proved to be an efficient ligand for the copper-catalyzed C–N coupling reactions.N-arylation of imidazoles with aryl iodides catalyzed by CuCl/L2 was smoothly carried out in DMSO at 100 8C with a yield up to 98%.N-arylation of 1H-pyrazole with aryl iodides and bromides catalyzed by Cu（OAc）2/L2 in 1 4-dioxane also gave the corresponding products with yields of40%–98%.
文摘A new phosphorylating reagent, N,N-di-isopropyl-O,O-di-p-methoxybenzylphosphoramidite was synthesized from diisopropylamino dichlorophosphine and p-methoxybenzyl alcohol for preparing phosphatydyl inositol polyphosphate particularly with unsaturated components.
文摘A mild,green,convenient and scalable N-bromosuccinimide(NBS)promoted direct phosphorylation strategy of secondary phosphine oxides and alcohols for the synthesis of various phosphinate esters was developed.A variety of substrates are well-tolerated and the desirable compounds were afforded in moderate to excellent yields(up to 92%).This reaction is conducted at room temperature without the addition of any oxidant and metal catalyst,which provides a new strategy for the synthesis of phosphinate esters.
文摘Organic phosphorus compounds containing sp^(3)-C—P(O)bonds are increasingly widely applied in catalysis,pharmaceuticals,materials,pesticides,and other fields,and their synthesis has become a research hotspot in chemistry.Diarylmethyl phosphine oxides are important organic phosphorus compounds containing sp^(3)-C—P(O)bonds,but their synthesis is limited.Traditional methods for their synthesis require the use of halogenated compounds and harsh reaction conditions.A new method for the copper-mediated synthesis of(diarylmethyl)diarylphosphine oxides has been developed.This method involves the cleavage of the sp^(3)-C—N bond in N-diarylmethylsulfonamides,leading to the formation of diarylmethyl carbocations.The carbocations then react with diarylphosphine oxides to construct sp^(3)-C—P(O)bonds.Our method only requires the addition of stoichiometric,inexpensive CuBr2 and produces a series of target compounds in satisfactory yields.Thus,it provides a convenient,and cost-effective pathway for the synthesis of diarylmethyl phosphine oxides.
