检索结果-南通市图书馆

The facile insertion of β-keto sulfones to arynes:The direct preparation of polysubstituted ortho-keto benzyl sulfones

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第6期19卷 631-633页

作者： Jian Xue Lu Ling Wu Xian Huang Department of Chemistry Zhejiang University （Campus Xixi） Hangzhou 310028 PR China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 PR China

One novel carbon-carbon bond insertion reaction of arynes has been developed. By this reaction β-keto sulfones can insert the triple bond of arynes to prepare polysubstituted ortho-keto benzyl sulfones.

关键词： arynes insertion reaction C-C bonds β-Keto sulfones

insertion of Selenium into Zinc Carbon Bond and Application in Synthesis of Arylselenoester

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2002年第4期13卷 283-284页

作者： XinHuaXU WenQiLiU CollegeofChemistryandChemicalEngineering HunanUniversityChangsha410082 DepartmentofChemistryofChenzhouTeachercollege Chenzhou423000

Selenium was inserted into the zinc carbon bond of aryl zinc halides to form corresponding zinc selenoates. They reacted in THF-HMPA with acylhalides to afford the selenoesters in high yields.

关键词： Selenium insertion reaction zinc carbon bond acylhalides selenoester.

Theoretical Study on the Mechanism of CF_2 reaction with CH_2O

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2008年第9期27卷 1039-1044页

作者：李志锋吕玲玲朱元成刘新文 College of Life Science and Chemistry Tianshui Normal University

The insertion reaction mechanism of CF2 with CH2O was investigated at the B3LYP/6-311G（d）//MP2/6-311G（d） level. The geometric conformations at each stationary point in reaction potential surface were fully optimized and the transition states were verified by intrinsic reaction coordinate （IRC） and frequency analysis. The energies of all reactants were calculated with CCSD（T）/6-311G（d）//G2MP2 methods. Results indicated that the P1 reaction route with difuoroaldehyde as product is the dominant reaction pathway, which exhibits nucleophilic character. According to NBO analysis, the starting point of insertion reaction is the interaction between carbene LP（C3） and formaldehyde π（Cl-O2）. Besides, the thermodynamic and dynamic properties of dominated reaction （1） at different temperature were studied with statistic thermodynamic method and Eyring transition state theory adjusted by Wigner means, from which the proper temperature （500- 1200 K） of reaction （1） could be estimated. Finally, the thermo- dynamic and dynamic properties of insertion reaction mechanisms （CF2, CX2 （X = Cl, Br） with CH2O） were compared and discussed.

关键词： CF2 CH2O insertion reaction density functional theory thermodynamic and dynamic properties

Synthesis and Crystal Structure of N-phenylthiocyano-phenyl-thioformamide bis(η_5-methylcyclopentadienyl)(tetrahydrofuran)Samarium(Ⅲ)

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2002年第5期20卷 370-373页

作者：李焕荣姚英明沈琪王璐郁开北 DepartmentofChemistryandChemicalEngineering SuzhouUniversitySuzhou215006China DepartmentofChemistryandChemicalEngineering SuzhouUniversitySuzhou215006China／／StateKeyLaboratoryofOrganometallicChemistryShanghaiInstituteofOrganicChemistryChineseAcademyofSciencesShanghai200032.Chinn ChengduInstituteofOrganicChemistry AcademiaSinicaChengdu610041China

The insertion reaction of phenyl isothiocyanate into the Ln S bond was studied. Phenyl isothiocyanate reacted with [(CH 3C 5H 4) 2Sm(SPh)(THF)] 2 to give the title complex, (CH 3C 5H 4) 2Sm[SC(SPh)NPh](THF), in good yield, which was characterized by elemental analyses, IR, 1H NMR and X ray structural determination. The crystal structure analysis of complex shows that samarium atom is coordinated by two CH 3C 5H 4 groups, one O atom of THF, and N and S atoms from the SC(SPh)NPh ligand to form a distorted trigonal bipyramidal geometry.

关键词： rare earths samarium thiolate complex insertion reaction phenyl isothiocyanate

reaction of Bis(Methylcyclopentadienyl) Lanthanide Amido Complex with n-Hexyl isocyanate-Synthesis and Characterization of {(MeC_5H_4)_2YbOC(NPh_2)N(n-hexyl)}_2

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2005年第6期23卷 653-656页

作者：郭华东姚英明邓明宇张勇沈琪 School of Chemistry and Chemical Engineering Suzhou University Suzhou 215006 China School

Bis （methylcyclopentadienyl） lanthanide amido complex （MeCp） 2YbNPh2 （THF） reacted with n-hexyl isocyanate （n-nexylNCO） in 1：1 molar ratio to give {（MeC5H4）2Yb[OC（NPh2）N（n-hexyl）] }2（1）. Complex 1 was characterized by elemental analyses and X-ray diffraction. The title complex belongs to trigonal system and R-3 space group. Its unit cell parameters are a =2.9533（11） nm, b =2.9533（11） nm, c = 1.5873（6） nm, V= 11.9896（80） nm^3, Z =9, Dc= 1.562 mg·m^-3, μ = 3.536 mm^-1（Mo Kα）, F（000） =5670, R =0.034, Rw =0.064. It is a dimeric structure with two symmetrical bridged oxygen atoms. Nitrogen atom is coordinated to the ytterbium atom to form a tricyclic backbone. The coordination number of ytterbium is 9. The whole molecule shows central symmetry.

关键词： inorganic chemistry cyclopentadienyl lanthanide amido complex n-hexyl isocyanate insertion reaction crystal structure rare earths

Synthesis and crystal structure of（C5Me4SiMe3）[（^iPrN）2CCH2SiMe3]2Y

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2009年第1期27卷 18-21页

作者：陈珏王秀莲罗云杰姚英明 Organometallic Chemistry Laboratory Ningbo Institute of TechnologyZhejiang University Department of Chemistry and Chemical Engi-neering Suzhou University

reaction of（C5Me4SiMe3）Y（CH2SiMe）2（THF） with two equivalents of iPrN=C=NiPr in hexane at room temperature afforded a mixed-ligand yttrium complex（C5Me4SiMe3）（iPrN）2CCH2SiMe32Y.X-ray diffraction revealed that the center metal was nine-coordinated by one cyclopentadienyl ring and two amidinate ligands, and adopted a four-legged piano stool geometry.

关键词： organo yttrium complex insertion reaction crystal structure rare earths

Gold carbene chemistry from diazo compounds

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2015年第17期60卷 1479-1492页

作者： Fang Wei Chuanling Song Yudao Ma Ling Zhou Chen-Ho Tung Zhenghu Xu Key Laboratory for Colloid and Interface Chemistry of Education Ministry School of Chemistry and Chemical Engineering Shandong University Department of Chemistry and Biochemistry Miami University State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

Diazo compounds are generally used as carbene precursors. Traditionally, dirhodium, copper and iron catalysts were used to decompose diazo compounds to form the key metal carbene intermediates. Recently, the gold catalysts have been developed as a unique type of metal catalyst to decompose diazo compounds. The derived gold carbene showed much different characters comparing with other transition metal carbenes. They could go through a series of cycloaddition, insertion and coupling reactions. Here, the recent progress of the gold carbene chemistry from diazo compounds was reviewed, including the scope of reactions,mechanism and synthetic applications.

关键词： Gold carbene Diazo compounds Cycloaddition insertion reaction Coupling reaction

Infrared Photodissociation Spectroscopy of Ti＋（CO2）2Ar and Ti＋（CO2）n （n=3-7） Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2013年第6期26卷 687-693,I0004页

作者： Xiao-peng Xing Guan-jun Wang Cai-xia Wang Ming-fei Zhou Department of Chemistry Tongji University Shanghai 200092 China Department of Chemistry Shanghai Key Laboratory of Molecular Catalysts and Innovative MaterialsFudan University Shanghai 200433 China

Ti＋（CO2）2Ar and Ti＋（CO2）n （n=3-7） complexes are produced by laser vaporization in a pulsed supersonic expansion. The ion complexes of interest are each mass-selected in a time- of-flight spectrometer, and studied with infrared photodissociation spectroscopy. For each complex, a sharp band in the CO stretching frequency region is observed, which confirms the formation of the OTi＋CO（CO2）~_l oxide-carbonyl species. Small OTi＋CO（CO2）~_1 complexes （n_〈5） exhibit CO stretching and antisymmetric CO2 stretching vibrational bands that are blue-shifted from those of free CO and CO2. The experimental observations indicate that the coordination number of CO and CO2 molecules around TiO＋ is five. Evidence is also observed for the presence of another electrostatic bonding Ti＋（CO2）2 structural isomer for the Ti＋（CO2）2Ar complex, which is characterized to have a bent OCO-Ti＋-OCO structure stabilized by argon coordination.

关键词： Infrared photodissociation spectroscopy Carbon dioxide complex Titanium insertion reaction Density functional calculation

Neural Network-based Global ab initio Potential Energy Surface for the 21A" State of C(1D)+H2 Reactive System

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Network-based Global ab initio Potential Energy Surfa...