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Opening Reaction (opening + reaction)

Distribution by Scientific Domains
Chemistry75%

Kinds of Opening Reaction

  • ring opening reaction
    		•

    Selected Abstracts

    ChemInform Abstract: Dimercaptoethane Oxirane Ring Opening Reaction: ,,,,-Dihydroxy Dithioether Synthesis.

    CHEMINFORM, Issue 30 2001
    Moufida Romdhani Younes
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    Ring Opening Reactions of N-Alkyl Oxazolidinones with Organolithium Reagents.

    CHEMINFORM, Issue 25 2004
    Simon Jones
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]

    ChemInform Abstract: Ring Opening Reactions in Benzocyclobutenonic Systems.

    CHEMINFORM, Issue 31 2001
    Paul Catalin F. Balaure
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Ring Opening Reactions of N-Phenylsulfonyl Substituted Spiro-,-lactams.

    CHEMINFORM, Issue 12 2001
    Piero Dalla Croce
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    Macrocyclic polyamine-modified poly(glycidyl methacrylate- co -ethylene dimethacrylate) monolith for capillary electrochromatography

    ELECTROPHORESIS, Issue 11 2008
    Yun Tian
    Abstract 1,4,10,13,16-Pentaazatricycloheneicosane-9,17-dione (macrocyclic polyamine)-modified polymer-based monolithic column for CEC was prepared by ring opening reaction of epoxide groups from poly(glycidyl methacrylate- co -ethylene dimethacrylate) (GMA- co -EDMA) monolith with macrocyclic polyamine. Conditions such as reaction time and concentration of macrocyclic polyamine for the modification reaction were optimized to generate substantial EOF and enough chromatographic interactions. Anodic EOF was observed in the pH range of 2.0,8.0 studied due to the protonation of macrcyclic polyamine at the surface of the monolith. Morphology of the monolithic column was examined by SEM and the incorporation of macrocyclic polyamine to the poly(GMA- co -EDMA) monolith was characterized by infrared (IR) spectra. Successful separation of inorganic anions, isomeric benzenediols, and benzoic acid derivatives on the monolithic column was achieved for CEC. In addition to hydrophobic interaction, hydrogen bonding and electrostatic interaction played a significant role in the separation process. [source]

    Capillary electrochromatography with zwitterionic stationary phase on the lysine-bonded poly(glycidyl methacrylate- co -ethylene dimethacrylate) monolithic capillary column

    ELECTROPHORESIS, Issue 12 2006
    Xiaoli Dong
    Abstract A polymer-based neutral monolithic capillary column was prepared by radical polymerization of glycidyl methacrylate and ethylene dimethacrylate in a 100,,m id fused-silica capillary, and the prepared monolithic column was subsequently modified based on a ring opening reaction of epoxide groups with 1,M,lysine in solution (pH,8.0) at 75°C for 10,h to produce a lysine chemically bonded stationary phases in capillary column. The ring opening reaction conditions were optimized so that the column could generate substantial EOF. Due to the zwitterionic functional groups of the lysine covalently bonded on the polymer monolithic rod, the prepared column can generate cathodic and anodic EOF by varying the pH values of running buffer during CEC separation. EOF reached the maximum of ,2.0×10,8,m2v,1s,1 and 2.6×10,8,m2v,1s,1 with pH of the running buffer of 2.25 and 10, respectively. As a consequence, neutral compounds, ionic solutes such as phenols, aromatic acids, anilines, and basic pharmaceuticals were all successfully separated on the column by CEC. Hydrophobic interaction is responsible for separation of neutral analytes. In addition, the electrostatic and hydrophobic interaction and the electrophoretic migration play a significant role in separation of the ionic or ionizable analytes. [source]

    Formation and x-ray crystallographic analysis of a 1,2,5 -oxaphosphol-5(2H)-one

    HETEROATOM CHEMISTRY, Issue 4 2001
    Naokazu Kano
    Reaction of an iminophosphorane 2 bearing the Martin ligand with dimethyl acetylenedicarboxylate, followed by a ring opening reaction of a [2+2]-cycloadduct between them, gave the corresponding ,-iminoalkylidenephosphorane 3, which was hydrolyzed to afford 1,2,5 -oxaphosphol-5(2H)-one 4. The structure of the novel five-membered ring compound 4 was established by X-ray crystallographic analysis. © 2001 John Wiley & Sons, Inc. Heteroatom Chem 12:282,286, 2001 [source]

    Fragmentation Mechanism of Trans -,-Aryl-,-enamino Esters

    CHINESE JOURNAL OF CHEMISTRY, Issue 8 2002
    Nan Jiang
    Abstract Electron impact-induced fragmentation mechanisms of trans-, -aryl- , -enamino esters were investigated using mass-analyzed ion kinetic energy (MIKE) spectrometry and high resolution accurate mass data. It was found that the main characteristic fragmentations of compounds studied were: an odd electron ion M+ - EtOH was formed by losing a neutral molecule of ethanol; and the skeletal rearrangements took place; and the ring opening reaction happened after losing a carbon monoxide; and the typical McLafferty rearrangement underwent in ester group. The cyclization reaction caused by losing neutral molecule of TsNH2 due to the ortho -effects of substituted group of aromatic ring was also observed. [source]