Two procedures were compared for extraction and clean-up of 20organophosphorus and 19 pyrethroid pesticides in sediment to identify the more effective procedurefor groups of pesticides or individual compounds. In Proc...Two procedures were compared for extraction and clean-up of 20organophosphorus and 19 pyrethroid pesticides in sediment to identify the more effective procedurefor groups of pesticides or individual compounds. In Procedure I, methanol/water and n-hexane wereused for extraction, and 1:10 (v/v) dichloromethane in n-hexane and acetone were used as eluents foreluting the analyte through the cartridge, with one evaporating steps on a rotary evaporator andtwo eluting steps on the cartridge. n-hexane/acetone (2:1, v/v) was used for extraction and elutionin Procedure II with one evaporating step on a rotary evaporator and one eluting step on thecartridge. All extractions were performed under an ultrasonic bath and gas chromatography and massspectrometry were utilized for measurements. Procedure II was developed as a rapid, timesaving, lesscostly and safer substitute for Procedure I which was an old method. Procedure II was moreeffective for almost all the organophosphorus pesticides tested and 11of the 19 pyrethroidpesticides, while Procedure I was more appropriate for analysis of 5 pyrethroid pesticides. However,recoveries of most pyrethroid pesticides were fairly low. Thus, further studies should focus onadjustment and formulation of solvents for more efficient extraction and clean-up of pyrethroidpesticides from sediment samples.展开更多
The title compound (C30H32NO4PGe), O,O-dimethyl-N-(β-triphenylgermanyl) propionyl-α-aminobenzylphosphonates was synthesized by a convenient method, and its crystal structure was determined by single-crystal X-ray di...The title compound (C30H32NO4PGe), O,O-dimethyl-N-(β-triphenylgermanyl) propionyl-α-aminobenzylphosphonates was synthesized by a convenient method, and its crystal structure was determined by single-crystal X-ray diffraction. The crystal is triclinic, space group P-1 with parameters: a=9.7753(5), b=11.5773(5), c=13.5059(6) ?, α=104.185(1),β= 95.971(1), γ =96.727(1)°, V=1457.63(12) ?3, Z=2, Mr=574.13, Dc=1.308 g/cm3, λ=0.71073 ?, μ = 1.139mm-1, and F(000)=596. The structure was solved by direct methods. The structure was refined to R=0.0257, wR=0.0705 for 5080 observed reflections with I >2σ(I).The result of structure analysis indicates that atom Ge is sp3 hydridized because the arrangement of the four carbon atoms bonded to it is a distorted tetrahedron. The geometry of the three phenyl groups linking with the Ge atom looks like a propeller form.展开更多
Although many aroma components have been identified in green tea leaves, the aroma compounds contributing to green tea＇s characteristic odor have not yet been reported. The authors recently reported that aroma compon...Although many aroma components have been identified in green tea leaves, the aroma compounds contributing to green tea＇s characteristic odor have not yet been reported. The authors recently reported that aroma components with a matcha-like odor are present in both green tea and black tea prepared from the Sayamakaori tea cuttivar. This matcha-like odor is similar to the odor of commercial available matcha （high-quality powdered green tea）, and is a specific odor feature of green tea leaves. At present, the green-tea odor is thought to arise from the combination of a large number of constituents. Recent reports indicate that a complex interaction between olfactory receptors and odorants is important for the evaluation of the odors. Taking into consideration these findings, the authors investigated the aroma profile of green tea, focusing on the characteristic molecular structures of the constituents that give matcha-like odor. Using a combination of organic synthesis and gas chromatography-mass spectrometry plus gas chromatography-olfactometry, the authors identified aroma components with matcha-like odors in five other tea cultivars. This investigation also revealed that several compounds with a formyl group were important constituents of the aroma of green tea leaves, although the odor of each constituent was not individually similar to the tea＇s overall aroma. The authors found for the first time a group of key components that have the matcha-like odor.展开更多
It is a very fine substitutable energy technology to synthesize ethanol from biomass-derived syngas. This paper summarized the development of preparing ethanol from syngas, and especially elaborated on the research st...It is a very fine substitutable energy technology to synthesize ethanol from biomass-derived syngas. This paper summarized the development of preparing ethanol from syngas, and especially elaborated on the research status of catalysts for the process. Based on the relative researches on the reaction mechanism, structure and performance of the catalysts, the optimum design of catalysts with high activity was presented in this review, which set the theoretical and application foundation for the industrial production of ethanol from syngas.展开更多
This paper presents the results of the search of biologically active uranium compounds such as amino acids. We first received and examined X-ray and IR （infrared radiation） spectroscopy of uranium complexes with α-...This paper presents the results of the search of biologically active uranium compounds such as amino acids. We first received and examined X-ray and IR （infrared radiation） spectroscopy of uranium complexes with α- and β-amino acids in aqueous and organic solution. We proposed a method for direct synthesis of complex organic compounds of uranium chloride UO2Cl2 with α- andβ-amino acids for the synthesis of drugs for the treatment of cancer.展开更多
The Diels-Alder reaction of bis(diphenylphosphine oxide)butadiyne (BDPPOB) with spiro[2.4]hepta-4,6-diene affords the title compound, 2-(diphenylphosphine oxide)-3-(diphen- ylphosphine oxide ethynyl)spiro[bicyclo[2.2....The Diels-Alder reaction of bis(diphenylphosphine oxide)butadiyne (BDPPOB) with spiro[2.4]hepta-4,6-diene affords the title compound, 2-(diphenylphosphine oxide)-3-(diphen- ylphosphine oxide ethynyl)spiro[bicyclo[2.2.1] hepta-2,5-diene-7,1-cyclopropane] (DDSHC, C35H28O2P2, Mr = 542). Its crystal structure belongs to monoclinic system, space group P21/n with a =12.708(3), b = 14.666(4), c = 15.048(4) ? = 93.903(5) ? V = 2798.1(13) ?, Z = 4, Dc = 1.288g/cm3, F(000)=1136, (MoK? = 0.187mm-1, final R = 0.0626 and wR= 0.1422 for 4685 independent reflections with I > 2(I). Structural analyses reveal that the title compound is nonplanar and the dihedral angles between two phenyl rings around each phosphorus atom are 71.7(2) and 70.7(3)? respectively.展开更多
Molybdenum(I) -compound [Mo2(SC6H11)2(CO)8]1,crystallizes in monoclinic,space group P21/c with a=9.5863(9),b=9.4469(9),c=13.869(1)A,β=99.697(2)°,V=1238.1(2)A^3,Z=2,Dc=1.734g/cm^3 ,μ=12.23cm^-1 and F(000)=644.Th...Molybdenum(I) -compound [Mo2(SC6H11)2(CO)8]1,crystallizes in monoclinic,space group P21/c with a=9.5863(9),b=9.4469(9),c=13.869(1)A,β=99.697(2)°,V=1238.1(2)A^3,Z=2,Dc=1.734g/cm^3 ,μ=12.23cm^-1 and F(000)=644.The final R=0.0455 and wR=0.1159 for 1590 observed reflections with I>2ó(I).1 possesses a rhombic bimetallic core MoS2Mo with the Mo-Mo bond length of 2.975(1) and Mo-S of 2.485(2)A。展开更多
Bib(β--alkoxycarbonylalkyl)tin dichlorides were interfacial condensed with organic dithio--alcohols to give a series of new organo--tin polymers. Experimental parameters were discussed. The polymers synthesized were ...Bib(β--alkoxycarbonylalkyl)tin dichlorides were interfacial condensed with organic dithio--alcohols to give a series of new organo--tin polymers. Experimental parameters were discussed. The polymers synthesized were tested for their effect on the heat--stabilization of PVC resins. The results are of interest in this area of application展开更多
The authors spent the search for new methods of synthesis possible of organometallic compounds of phosphorus, arsenic, antimony, bismuth. For modifications classical reactions the N （nitrogen） atoms have been replac...The authors spent the search for new methods of synthesis possible of organometallic compounds of phosphorus, arsenic, antimony, bismuth. For modifications classical reactions the N （nitrogen） atoms have been replaced on atoms of P （phosphorus）, As （arsenic）, Sb （antimony） and Bi （bismuth）. The authors have proposed a new mechanism for the possible reactions.展开更多
A novel ionic organotin complex{[Ph_(2)Sn]_(2)[2,6-(O_(2)C)_(2)]C_(5)H_(3)N}_(3)H_(2)O}^(2-)[HNEt_(3)]^(2+)has been unexpectedly obtained by the reaction of Ph_(3)SnCl and 2,6-pyridine dicarboxylic acid in 1:1 molar r...A novel ionic organotin complex{[Ph_(2)Sn]_(2)[2,6-(O_(2)C)_(2)]C_(5)H_(3)N}_(3)H_(2)O}^(2-)[HNEt_(3)]^(2+)has been unexpectedly obtained by the reaction of Ph_(3)SnCl and 2,6-pyridine dicarboxylic acid in 1:1 molar ratio in the presence of organic base Et_(3)N.Possible dephenylation mechanism was illustrated.The X-ray diffraction study has shown that the title complex consists of cation moiety[HNEt_(3)]^(+)and anion moiety{[Ph_(2)Sn]_(2)[2,6-(O_(2)C_(2))C_(5)H_(3)N]_(3)H_(2)O}^(2-)with tin(IV)in a pengonal bipyramidal coordination geometry.展开更多
We first received and examined X-ray and IR （infra red） spectroscopy of uranium complexes with sugars. We proposed a method for direct synthesis of complex organic compounds, uranium chloride UO2Cl2 with various sug...We first received and examined X-ray and IR （infra red） spectroscopy of uranium complexes with sugars. We proposed a method for direct synthesis of complex organic compounds, uranium chloride UO2Cl2 with various sugars （D-glucose, D （＋） maltose, D-sucrose, D-lactose and the polysaccharide Dextran） as potential precursors for the treatment of cancer diseases.展开更多
The term polychlorinated biphenyls, or PCBs refers to a class of synthetic organic chemicals that are, to a large degree, chemically inert. PCBs are not found in a nature as a natural compounds and its appearance in n...The term polychlorinated biphenyls, or PCBs refers to a class of synthetic organic chemicals that are, to a large degree, chemically inert. PCBs are not found in a nature as a natural compounds and its appearance in natural environment is connected with unintentional and irresponsible human activity. PCBs have been produced on an industrial scale for more than 50 years and have been exported as chemicals in products to almost every country in the world. PCBs were commonly used as dielectric fluids in transformers and capacitors, in heat transfer and hydraulic systems. Other uses of PCBs included the formulation of lubricating and cutting oils, as plasticizers in paints. Nowadays PCBs are ranked among the compounds called POP （Persistent Organic Pollutants）. This group of hazard removable pollutants includes pesticides, dioxins and furans also. Fishes fished from August 2006 to December 2007 from lakes in north-east Poland： Lafiskie, Kisajno and Niegocin. The investigations were carried out on four fish species： roach, common bream, perch and pike. According to the preliminary mass and length measurements anticipatory treatment were realized. Subsequently fishes were analysed in accordance with National Institute of Hygiene method. According to the investigations results PCBs were found in fish muscular tissues, fished from north-east lakes. PCB level didn＇t exceed the highest acceptable daily dose （4pg-TEQ body mass/day）.展开更多
Total syntheses of terpenoids play an essential role in the development of synthetic organic chemistry and medicinal science.Chinese synthetic community has made more and more profound contribution to this field and h...Total syntheses of terpenoids play an essential role in the development of synthetic organic chemistry and medicinal science.Chinese synthetic community has made more and more profound contribution to this field and has gradually grown into a major force in the world over the past years. In this review, we shall celebrate the achievement by surveying the recent terpenoid syntheses from China since 2010.展开更多
The design and synthesis of highly active non-noble metal oxide catalysts, such as transition- and rare-earth-metal oxides, have attracted significant attention because of their high efficiency and low cost and the re...The design and synthesis of highly active non-noble metal oxide catalysts, such as transition- and rare-earth-metal oxides, have attracted significant attention because of their high efficiency and low cost and the resultant potential applications for the degradation of volatile organic compounds(VOCs). The structure-activity relationships have been well-studied and used to facilitate design of the structure and composition of highly active catalysts. Recently, non-noble metal oxides with porous structures have been used as catalysts for deep oxidation of VOCs, such as aromatic hydrocarbons, aliphatic compounds, aldehydes, and alcohols, with comparable activities to their noble metal counterparts. This review summarizes the growing literature regarding the use of porous metal oxides for the catalytic removal of VOCs, with emphasis on design of the composition and structure and typical synthetic technologies.展开更多
基金Project supported by the Outstanding Youth Fund of National Natural Science Foundation of China, the National Key Basic Research Support Foundation (NKBRSF) of China (No. 2002CB410805) and the Federal Ministry of Education and Research, Germany.
文摘Two procedures were compared for extraction and clean-up of 20organophosphorus and 19 pyrethroid pesticides in sediment to identify the more effective procedurefor groups of pesticides or individual compounds. In Procedure I, methanol/water and n-hexane wereused for extraction, and 1:10 (v/v) dichloromethane in n-hexane and acetone were used as eluents foreluting the analyte through the cartridge, with one evaporating steps on a rotary evaporator andtwo eluting steps on the cartridge. n-hexane/acetone (2:1, v/v) was used for extraction and elutionin Procedure II with one evaporating step on a rotary evaporator and one eluting step on thecartridge. All extractions were performed under an ultrasonic bath and gas chromatography and massspectrometry were utilized for measurements. Procedure II was developed as a rapid, timesaving, lesscostly and safer substitute for Procedure I which was an old method. Procedure II was moreeffective for almost all the organophosphorus pesticides tested and 11of the 19 pyrethroidpesticides, while Procedure I was more appropriate for analysis of 5 pyrethroid pesticides. However,recoveries of most pyrethroid pesticides were fairly low. Thus, further studies should focus onadjustment and formulation of solvents for more efficient extraction and clean-up of pyrethroidpesticides from sediment samples.
文摘The title compound (C30H32NO4PGe), O,O-dimethyl-N-(β-triphenylgermanyl) propionyl-α-aminobenzylphosphonates was synthesized by a convenient method, and its crystal structure was determined by single-crystal X-ray diffraction. The crystal is triclinic, space group P-1 with parameters: a=9.7753(5), b=11.5773(5), c=13.5059(6) ?, α=104.185(1),β= 95.971(1), γ =96.727(1)°, V=1457.63(12) ?3, Z=2, Mr=574.13, Dc=1.308 g/cm3, λ=0.71073 ?, μ = 1.139mm-1, and F(000)=596. The structure was solved by direct methods. The structure was refined to R=0.0257, wR=0.0705 for 5080 observed reflections with I >2σ(I).The result of structure analysis indicates that atom Ge is sp3 hydridized because the arrangement of the four carbon atoms bonded to it is a distorted tetrahedron. The geometry of the three phenyl groups linking with the Ge atom looks like a propeller form.
文摘Although many aroma components have been identified in green tea leaves, the aroma compounds contributing to green tea＇s characteristic odor have not yet been reported. The authors recently reported that aroma components with a matcha-like odor are present in both green tea and black tea prepared from the Sayamakaori tea cuttivar. This matcha-like odor is similar to the odor of commercial available matcha （high-quality powdered green tea）, and is a specific odor feature of green tea leaves. At present, the green-tea odor is thought to arise from the combination of a large number of constituents. Recent reports indicate that a complex interaction between olfactory receptors and odorants is important for the evaluation of the odors. Taking into consideration these findings, the authors investigated the aroma profile of green tea, focusing on the characteristic molecular structures of the constituents that give matcha-like odor. Using a combination of organic synthesis and gas chromatography-mass spectrometry plus gas chromatography-olfactometry, the authors identified aroma components with matcha-like odors in five other tea cultivars. This investigation also revealed that several compounds with a formyl group were important constituents of the aroma of green tea leaves, although the odor of each constituent was not individually similar to the tea＇s overall aroma. The authors found for the first time a group of key components that have the matcha-like odor.
基金Project (No. 06GG2209052) supported by the Natural Science Foundation of Shandong Province, China
文摘It is a very fine substitutable energy technology to synthesize ethanol from biomass-derived syngas. This paper summarized the development of preparing ethanol from syngas, and especially elaborated on the research status of catalysts for the process. Based on the relative researches on the reaction mechanism, structure and performance of the catalysts, the optimum design of catalysts with high activity was presented in this review, which set the theoretical and application foundation for the industrial production of ethanol from syngas.
文摘This paper presents the results of the search of biologically active uranium compounds such as amino acids. We first received and examined X-ray and IR （infrared radiation） spectroscopy of uranium complexes with α- and β-amino acids in aqueous and organic solution. We proposed a method for direct synthesis of complex organic compounds of uranium chloride UO2Cl2 with α- andβ-amino acids for the synthesis of drugs for the treatment of cancer.
基金This work was supported by the NNSFC (No. 29832030 and 20072018)
文摘The Diels-Alder reaction of bis(diphenylphosphine oxide)butadiyne (BDPPOB) with spiro[2.4]hepta-4,6-diene affords the title compound, 2-(diphenylphosphine oxide)-3-(diphen- ylphosphine oxide ethynyl)spiro[bicyclo[2.2.1] hepta-2,5-diene-7,1-cyclopropane] (DDSHC, C35H28O2P2, Mr = 542). Its crystal structure belongs to monoclinic system, space group P21/n with a =12.708(3), b = 14.666(4), c = 15.048(4) ? = 93.903(5) ? V = 2798.1(13) ?, Z = 4, Dc = 1.288g/cm3, F(000)=1136, (MoK? = 0.187mm-1, final R = 0.0626 and wR= 0.1422 for 4685 independent reflections with I > 2(I). Structural analyses reveal that the title compound is nonplanar and the dihedral angles between two phenyl rings around each phosphorus atom are 71.7(2) and 70.7(3)? respectively.
基金This research was supported by grants from the NNSFC SKLSC(No.01008 and No.980148-2)
文摘Molybdenum(I) -compound [Mo2(SC6H11)2(CO)8]1,crystallizes in monoclinic,space group P21/c with a=9.5863(9),b=9.4469(9),c=13.869(1)A,β=99.697(2)°,V=1238.1(2)A^3,Z=2,Dc=1.734g/cm^3 ,μ=12.23cm^-1 and F(000)=644.The final R=0.0455 and wR=0.1159 for 1590 observed reflections with I>2ó(I).1 possesses a rhombic bimetallic core MoS2Mo with the Mo-Mo bond length of 2.975(1) and Mo-S of 2.485(2)A。
文摘Bib(β--alkoxycarbonylalkyl)tin dichlorides were interfacial condensed with organic dithio--alcohols to give a series of new organo--tin polymers. Experimental parameters were discussed. The polymers synthesized were tested for their effect on the heat--stabilization of PVC resins. The results are of interest in this area of application
文摘The authors spent the search for new methods of synthesis possible of organometallic compounds of phosphorus, arsenic, antimony, bismuth. For modifications classical reactions the N （nitrogen） atoms have been replaced on atoms of P （phosphorus）, As （arsenic）, Sb （antimony） and Bi （bismuth）. The authors have proposed a new mechanism for the possible reactions.
文摘A novel ionic organotin complex{[Ph_(2)Sn]_(2)[2,6-(O_(2)C)_(2)]C_(5)H_(3)N}_(3)H_(2)O}^(2-)[HNEt_(3)]^(2+)has been unexpectedly obtained by the reaction of Ph_(3)SnCl and 2,6-pyridine dicarboxylic acid in 1:1 molar ratio in the presence of organic base Et_(3)N.Possible dephenylation mechanism was illustrated.The X-ray diffraction study has shown that the title complex consists of cation moiety[HNEt_(3)]^(+)and anion moiety{[Ph_(2)Sn]_(2)[2,6-(O_(2)C_(2))C_(5)H_(3)N]_(3)H_(2)O}^(2-)with tin(IV)in a pengonal bipyramidal coordination geometry.
文摘We first received and examined X-ray and IR （infra red） spectroscopy of uranium complexes with sugars. We proposed a method for direct synthesis of complex organic compounds, uranium chloride UO2Cl2 with various sugars （D-glucose, D （＋） maltose, D-sucrose, D-lactose and the polysaccharide Dextran） as potential precursors for the treatment of cancer diseases.
文摘The term polychlorinated biphenyls, or PCBs refers to a class of synthetic organic chemicals that are, to a large degree, chemically inert. PCBs are not found in a nature as a natural compounds and its appearance in natural environment is connected with unintentional and irresponsible human activity. PCBs have been produced on an industrial scale for more than 50 years and have been exported as chemicals in products to almost every country in the world. PCBs were commonly used as dielectric fluids in transformers and capacitors, in heat transfer and hydraulic systems. Other uses of PCBs included the formulation of lubricating and cutting oils, as plasticizers in paints. Nowadays PCBs are ranked among the compounds called POP （Persistent Organic Pollutants）. This group of hazard removable pollutants includes pesticides, dioxins and furans also. Fishes fished from August 2006 to December 2007 from lakes in north-east Poland： Lafiskie, Kisajno and Niegocin. The investigations were carried out on four fish species： roach, common bream, perch and pike. According to the preliminary mass and length measurements anticipatory treatment were realized. Subsequently fishes were analysed in accordance with National Institute of Hygiene method. According to the investigations results PCBs were found in fish muscular tissues, fished from north-east lakes. PCB level didn＇t exceed the highest acceptable daily dose （4pg-TEQ body mass/day）.
基金supported by the National Natural Science Foundation of China (21372127, 21572104)Program for New Century Excellent Talents in University
文摘Total syntheses of terpenoids play an essential role in the development of synthetic organic chemistry and medicinal science.Chinese synthetic community has made more and more profound contribution to this field and has gradually grown into a major force in the world over the past years. In this review, we shall celebrate the achievement by surveying the recent terpenoid syntheses from China since 2010.
基金supported by the National High Technology Research and Development Program of China(2012AA062702)the strategic project of the Chinese Academy of Sciences(XDB05050000)
文摘The design and synthesis of highly active non-noble metal oxide catalysts, such as transition- and rare-earth-metal oxides, have attracted significant attention because of their high efficiency and low cost and the resultant potential applications for the degradation of volatile organic compounds(VOCs). The structure-activity relationships have been well-studied and used to facilitate design of the structure and composition of highly active catalysts. Recently, non-noble metal oxides with porous structures have been used as catalysts for deep oxidation of VOCs, such as aromatic hydrocarbons, aliphatic compounds, aldehydes, and alcohols, with comparable activities to their noble metal counterparts. This review summarizes the growing literature regarding the use of porous metal oxides for the catalytic removal of VOCs, with emphasis on design of the composition and structure and typical synthetic technologies.
