Tetrazole-l-acetic acid was found to serve as a superior ligand for Cul-catalyzed N-arylation of imidazoles with aryl iodides under a low catalyst loading （5 mol% of Cul）. A variety of aryl iodides could he aminated...Tetrazole-l-acetic acid was found to serve as a superior ligand for Cul-catalyzed N-arylation of imidazoles with aryl iodides under a low catalyst loading （5 mol% of Cul）. A variety of aryl iodides could he aminated to provide the N-arylated products in good to excellent yields without the need of an inert atmosphere.展开更多
In the presence of CrC13 /Fe bimetal couple,per(poly)fluoroalkyl iodides add to vinyl cyclopropane compounds giving addition-ring-opening products in good yields.
(CH_3OCH_2CH_2C_5H_4)_2LnI(Ln=La,Nd)complexes have been synthesized by the reaction between NaI and[(CH_3OCH_2CH_2C_5H_4)_2LnCl]2 in THF;A single crystal X-ray study has shown that the lanthanum complex is an unsolvat...(CH_3OCH_2CH_2C_5H_4)_2LnI(Ln=La,Nd)complexes have been synthesized by the reaction between NaI and[(CH_3OCH_2CH_2C_5H_4)_2LnCl]2 in THF;A single crystal X-ray study has shown that the lanthanum complex is an unsolvated monomer with lanthanum(Ⅲ)in a trigonal bipyramidal coordination geometry if the cyclopentadienyl ring is regarded as occupying a single polyhedral vertex.展开更多
Initiated by CP_2TiCl_2/Fe redox system,2-halotetrafluoroethyl iodides readily reacted with alkynes or alkenes to give 1:1 adducts in good to excellent yields.
perfluoroalkyl iodides reacted with alkenes in acetonitrile solu- tion containing catalytic amount of organophosphine under mild condition to give the corresponding adducts in moderate to good yields.Reaction was show...perfluoroalkyl iodides reacted with alkenes in acetonitrile solu- tion containing catalytic amount of organophosphine under mild condition to give the corresponding adducts in moderate to good yields.Reaction was shown to involve a free radical mechanism.展开更多
Functionalized alkylzinc iodides will undergo 1,4-conjugation reaction with derivatives of β-nitrostyrene in the presence of Cu(OAc)2/LiCl to afford a polyfunctional nitro-compound in high yield.
Stereoselective transformation of Baylis-Hillman acetates I into corresponding （Z）-allyl iodides 2 has been achieved by treatment of I with samarium triiodide in THF. Remarkable rate acceleration of samarium triiodi...Stereoselective transformation of Baylis-Hillman acetates I into corresponding （Z）-allyl iodides 2 has been achieved by treatment of I with samarium triiodide in THF. Remarkable rate acceleration of samarium triiodide-mediated iodination of 1 was found when ionic liquid 1-n-butyl-3-methyl-imidazolium tetrafluroborate （[bmim]BF4） was used as reaction media in stead of THF. This novel approach proceeds readily at 50 ℃ within a few minutes to afford （Z）-allyl iodides 2 in excellent yields. A mechanism involving stereoselective iodination of the acetates of Baylis-Hillman adducts by samarium triiodide is described, in which a six-membered ring transition state played a key role in the stereoselective formation of 2.展开更多
An operationally simple and inexpensive catalyst system was developed for the cross coupling of potassium thiocyanate with aryl iodides by using CuI as catalyst, 1, 10-phenanthroline as ligand, and tetraethylammonium ...An operationally simple and inexpensive catalyst system was developed for the cross coupling of potassium thiocyanate with aryl iodides by using CuI as catalyst, 1, 10-phenanthroline as ligand, and tetraethylammonium iodide as activator. The procedure is applicable for the synthesis of diverse aryl thiocyanates without any exotic, poisonous reagents.展开更多
Reaction of polystyrene-supported lithium selenide with 3-acetoxy-2-methylene-alkanoates afforded the corresponding allyl selenide resins and subsequent cleavage from the polymer by treating with methyl iodide to furn...Reaction of polystyrene-supported lithium selenide with 3-acetoxy-2-methylene-alkanoates afforded the corresponding allyl selenide resins and subsequent cleavage from the polymer by treating with methyl iodide to furnish （Z）-allyl iodides in good yields and high purities. The polymeric selenium reagent can be regenerated and reused. So it is a environmentally benign reagent.展开更多
Motivated by the success of methylammonium lead iodide,substantial efforts have been made to search for moisture-and air-stable metal halide perovskites(MHPs)for various optoelectronic applications.Lowering the struct...Motivated by the success of methylammonium lead iodide,substantial efforts have been made to search for moisture-and air-stable metal halide perovskites(MHPs)for various optoelectronic applications.Lowering the structural dimensionality in 2D and quasi-2D MHPs greatly increases the stability,but the simultaneously lowered electronic dimensionality leads to less efficient and large anisotropic charge carrier separation and transport.Herein,we report the construction and characterization of three 3D MHP analogs APb_(2)I_(6)(A=linear alkyl-diammonium cation)displaying balanced high stability and isotropic photoresponse.Single-crystal-based devices exhibit on/off ratios of photocurrent higher than 1.0×10^(3) in all three crystallographic directions and ultra-long device stability(>12 months)at 40%relative humidity.The enhanced stability and quasi-isotropic photoresponse are ascribed to the specific choice of the cations and the genuine 3D electronic dimensionality.This type of 3D MPH analog is expected to be a promising candidate for fabricating high-performance optoelectronic devices.展开更多
Two new ternary chalcogenide-iodides,Ba_(3)Q_(4)I_(2)and Ba3Se4I2,were synthesized through high-temperature solid-state reactions,and their structures were determined via single-crystal X-ray diffraction.Both compound...Two new ternary chalcogenide-iodides,Ba_(3)Q_(4)I_(2)and Ba3Se4I2,were synthesized through high-temperature solid-state reactions,and their structures were determined via single-crystal X-ray diffraction.Both compounds are isostructural and crystallize in the monoclinic space group C2/c(no.15)with unit cell parameters of a=14.507(4)/15.080(7)Å,b=10.104(3)/10.400(5)Å,c=8.206(2)/8.383(4)Å,β=101.847(4)/103.206(8)°,and Z=4 for Ba_(3)Q_(4)I_(2)/Ba_(3)Se_(4)I_(2),respectively.展开更多
Herein,we report the first electrochemical strategy for the borylation of aryl iodides via a radical pathway using current as a driving force.A mild reaction condition allows an assorted range of readily available ary...Herein,we report the first electrochemical strategy for the borylation of aryl iodides via a radical pathway using current as a driving force.A mild reaction condition allows an assorted range of readily available aryl iodides to be proficiently converted into synthetically valuable arylboronic esters under transition metal catalyst-free conditions.Moreover,this method also shows good functional group tolerance.Initial control mechanistic experiments reveal the formation of aryl radical as a key intermediate and the current plays an important role in the generation of radical intermediate.展开更多
Amino acid precursors in protected amino alcohol form are important synthons that can be used as building-blocks for the hemisynthesis of non-natural amino acids.Serine can be used as a common starting material for th...Amino acid precursors in protected amino alcohol form are important synthons that can be used as building-blocks for the hemisynthesis of non-natural amino acids.Serine can be used as a common starting material for the synthesis of such compounds differently protected.Particularly,protected amino alcohols bearing an ethynyl and/or an iodoethynyl group can be used in cross-couplings,in 1,3-dipolar cycloadditions and/or in Nozaki-Hiyama-Kishi type reactions.We thus demonstrated that the efficiently protected amino alcohols derived from serine can be coupled to a sugar derivative by an indium mediated alkynylation reaction.The conditions of this coupling are compatible with such functionalized derivatives and allow envisaging an access to C-glycosylated amino acids.展开更多
Properties of trivalent rare earth ions have been extensively understood. Besidesthe +3 valent state, the rare earth elements also have +4, +2 and +1 valencies,clusters and mixture valent compounds. The research of th...Properties of trivalent rare earth ions have been extensively understood. Besidesthe +3 valent state, the rare earth elements also have +4, +2 and +1 valencies,clusters and mixture valent compounds. The research of their synthesis, structure,properties of unusual valent rare earth compounds has theoretical and practicalsignificance. It will broaden the horizon of rare earth chemistry and extend展开更多
A new copper and silver-mediated cyanation of aryl iodides with DDQ as a cyanide source is achieved, provid- ing nitriles with good yields. This new approach represents a safe method leading to aryl nitriles.
2-Polyfluoroalkyl quinoline derivatives were synthesized from the enaminones which were obtained from the reaction of FT-aryl polyfluoroalkyl imidoyl iodides with methyl ketones.
Radical addition of polyfluoroalkyl iodides to the C=C double bond of diethyl allylphos- phonate was carried out in CH_2Cl_2-H_2O two-phase medium in the presence of sodium dithionite to give dicthyl 3-polyfluoroalkyl...Radical addition of polyfluoroalkyl iodides to the C=C double bond of diethyl allylphos- phonate was carried out in CH_2Cl_2-H_2O two-phase medium in the presence of sodium dithionite to give dicthyl 3-polyfluoroalkyl-2-iodopropylphosphonates(3)in excellent yields.Compounds 3 were then converted to diethyl polyfluoroalkanephosphonates(4)by zinc-reduction,Thus a facile method for preparing polyfluoroalkanephosphonates is realized.展开更多
Perfluoroalkyl iodides reacted with various a-methylene oxacycloalkanes in the presence of sodium dithionite to give ring opening adducts. The reaction provided an efficient method for the syntheses of polyfunctional ...Perfluoroalkyl iodides reacted with various a-methylene oxacycloalkanes in the presence of sodium dithionite to give ring opening adducts. The reaction provided an efficient method for the syntheses of polyfunctional organofluorine compounds.展开更多
Homocoupling of aryl iodides catalyzed by cyclopalladated complexes of tertiary arylamines gives symmetric biaryls with good yields in DMA or ionic liquid [Bmim]BF4. This catalytic alternative of the Ullmann reaction ...Homocoupling of aryl iodides catalyzed by cyclopalladated complexes of tertiary arylamines gives symmetric biaryls with good yields in DMA or ionic liquid [Bmim]BF4. This catalytic alternative of the Ullmann reaction has proved to be sensitive to both electronic and steric factors of substrates.展开更多
基金supported fnancially by the National Basic Research Program of China(973 Program,No.2012CB722603)the Start-Up Foundation for Young Scientists of Shihezi University(Nos.RCZX201012,RCZX201014,RCZX201015)
文摘Tetrazole-l-acetic acid was found to serve as a superior ligand for Cul-catalyzed N-arylation of imidazoles with aryl iodides under a low catalyst loading （5 mol% of Cul）. A variety of aryl iodides could he aminated to provide the N-arylated products in good to excellent yields without the need of an inert atmosphere.
文摘In the presence of CrC13 /Fe bimetal couple,per(poly)fluoroalkyl iodides add to vinyl cyclopropane compounds giving addition-ring-opening products in good yields.
文摘(CH_3OCH_2CH_2C_5H_4)_2LnI(Ln=La,Nd)complexes have been synthesized by the reaction between NaI and[(CH_3OCH_2CH_2C_5H_4)_2LnCl]2 in THF;A single crystal X-ray study has shown that the lanthanum complex is an unsolvated monomer with lanthanum(Ⅲ)in a trigonal bipyramidal coordination geometry if the cyclopentadienyl ring is regarded as occupying a single polyhedral vertex.
文摘Initiated by CP_2TiCl_2/Fe redox system,2-halotetrafluoroethyl iodides readily reacted with alkynes or alkenes to give 1:1 adducts in good to excellent yields.
文摘perfluoroalkyl iodides reacted with alkenes in acetonitrile solu- tion containing catalytic amount of organophosphine under mild condition to give the corresponding adducts in moderate to good yields.Reaction was shown to involve a free radical mechanism.
文摘Functionalized alkylzinc iodides will undergo 1,4-conjugation reaction with derivatives of β-nitrostyrene in the presence of Cu(OAc)2/LiCl to afford a polyfunctional nitro-compound in high yield.
基金Project (No. 2004C21032) supported by the Key Technology R & DProgram of Zhejiang Province, China
文摘Stereoselective transformation of Baylis-Hillman acetates I into corresponding （Z）-allyl iodides 2 has been achieved by treatment of I with samarium triiodide in THF. Remarkable rate acceleration of samarium triiodide-mediated iodination of 1 was found when ionic liquid 1-n-butyl-3-methyl-imidazolium tetrafluroborate （[bmim]BF4） was used as reaction media in stead of THF. This novel approach proceeds readily at 50 ℃ within a few minutes to afford （Z）-allyl iodides 2 in excellent yields. A mechanism involving stereoselective iodination of the acetates of Baylis-Hillman adducts by samarium triiodide is described, in which a six-membered ring transition state played a key role in the stereoselective formation of 2.
文摘An operationally simple and inexpensive catalyst system was developed for the cross coupling of potassium thiocyanate with aryl iodides by using CuI as catalyst, 1, 10-phenanthroline as ligand, and tetraethylammonium iodide as activator. The procedure is applicable for the synthesis of diverse aryl thiocyanates without any exotic, poisonous reagents.
基金the National Natural Science Foundation of China （No. 20562005） NSF of Jiangxi Province （No. 0620021） for financial support.
文摘Reaction of polystyrene-supported lithium selenide with 3-acetoxy-2-methylene-alkanoates afforded the corresponding allyl selenide resins and subsequent cleavage from the polymer by treating with methyl iodide to furnish （Z）-allyl iodides in good yields and high purities. The polymeric selenium reagent can be regenerated and reused. So it is a environmentally benign reagent.
基金financially supported by the National Natural Science Foundation of China(Grants 21991144 and 21875035)。
文摘Motivated by the success of methylammonium lead iodide,substantial efforts have been made to search for moisture-and air-stable metal halide perovskites(MHPs)for various optoelectronic applications.Lowering the structural dimensionality in 2D and quasi-2D MHPs greatly increases the stability,but the simultaneously lowered electronic dimensionality leads to less efficient and large anisotropic charge carrier separation and transport.Herein,we report the construction and characterization of three 3D MHP analogs APb_(2)I_(6)(A=linear alkyl-diammonium cation)displaying balanced high stability and isotropic photoresponse.Single-crystal-based devices exhibit on/off ratios of photocurrent higher than 1.0×10^(3) in all three crystallographic directions and ultra-long device stability(>12 months)at 40%relative humidity.The enhanced stability and quasi-isotropic photoresponse are ascribed to the specific choice of the cations and the genuine 3D electronic dimensionality.This type of 3D MPH analog is expected to be a promising candidate for fabricating high-performance optoelectronic devices.
基金Prof.F.Osterloh for access to the UV-visible diffuse reflectance spectrometer.K.L.acknowledges the GAANN and ARCS fellowships.This research is supported by the U.S.Department of Energy,Office of Basic Energy Sciences,Division of Materials Sciences and Engineering under Award DE-SC0008931.
文摘Two new ternary chalcogenide-iodides,Ba_(3)Q_(4)I_(2)and Ba3Se4I2,were synthesized through high-temperature solid-state reactions,and their structures were determined via single-crystal X-ray diffraction.Both compounds are isostructural and crystallize in the monoclinic space group C2/c(no.15)with unit cell parameters of a=14.507(4)/15.080(7)Å,b=10.104(3)/10.400(5)Å,c=8.206(2)/8.383(4)Å,β=101.847(4)/103.206(8)°,and Z=4 for Ba_(3)Q_(4)I_(2)/Ba_(3)Se_(4)I_(2),respectively.
基金the National Natural Science Foundation of China(Grant No.21772003).
文摘Herein,we report the first electrochemical strategy for the borylation of aryl iodides via a radical pathway using current as a driving force.A mild reaction condition allows an assorted range of readily available aryl iodides to be proficiently converted into synthetically valuable arylboronic esters under transition metal catalyst-free conditions.Moreover,this method also shows good functional group tolerance.Initial control mechanistic experiments reveal the formation of aryl radical as a key intermediate and the current plays an important role in the generation of radical intermediate.
文摘Amino acid precursors in protected amino alcohol form are important synthons that can be used as building-blocks for the hemisynthesis of non-natural amino acids.Serine can be used as a common starting material for the synthesis of such compounds differently protected.Particularly,protected amino alcohols bearing an ethynyl and/or an iodoethynyl group can be used in cross-couplings,in 1,3-dipolar cycloadditions and/or in Nozaki-Hiyama-Kishi type reactions.We thus demonstrated that the efficiently protected amino alcohols derived from serine can be coupled to a sugar derivative by an indium mediated alkynylation reaction.The conditions of this coupling are compatible with such functionalized derivatives and allow envisaging an access to C-glycosylated amino acids.
基金Project supported by the National Natural Science Foundation of China the Chemical Laboratory on Rare Earth Elements, Changchun Institute of Applied Chemistry, Academia Sinica.
文摘Properties of trivalent rare earth ions have been extensively understood. Besidesthe +3 valent state, the rare earth elements also have +4, +2 and +1 valencies,clusters and mixture valent compounds. The research of their synthesis, structure,properties of unusual valent rare earth compounds has theoretical and practicalsignificance. It will broaden the horizon of rare earth chemistry and extend
基金We thank the National Natural Science Foundation of China （No. 21272178）, the Natural Science Founda- tion of Zhejiang Province （Nos. R4110294 and LY12B02010）.
文摘A new copper and silver-mediated cyanation of aryl iodides with DDQ as a cyanide source is achieved, provid- ing nitriles with good yields. This new approach represents a safe method leading to aryl nitriles.
基金Project partially supported by the National Natural Science Foundation of China(No:29632003).
文摘2-Polyfluoroalkyl quinoline derivatives were synthesized from the enaminones which were obtained from the reaction of FT-aryl polyfluoroalkyl imidoyl iodides with methyl ketones.
文摘Radical addition of polyfluoroalkyl iodides to the C=C double bond of diethyl allylphos- phonate was carried out in CH_2Cl_2-H_2O two-phase medium in the presence of sodium dithionite to give dicthyl 3-polyfluoroalkyl-2-iodopropylphosphonates(3)in excellent yields.Compounds 3 were then converted to diethyl polyfluoroalkanephosphonates(4)by zinc-reduction,Thus a facile method for preparing polyfluoroalkanephosphonates is realized.
文摘Perfluoroalkyl iodides reacted with various a-methylene oxacycloalkanes in the presence of sodium dithionite to give ring opening adducts. The reaction provided an efficient method for the syntheses of polyfunctional organofluorine compounds.
基金Project supported by the National Natural Science Foundation of China (No. 20172016) and Shanghai Phosphor Project of Science & Technology for Excellent Young Research (Nos. 01QA14017 and 02QA14016).
文摘Homocoupling of aryl iodides catalyzed by cyclopalladated complexes of tertiary arylamines gives symmetric biaryls with good yields in DMA or ionic liquid [Bmim]BF4. This catalytic alternative of the Ullmann reaction has proved to be sensitive to both electronic and steric factors of substrates.
