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  2. Diazomethane - Wikipedia

    en.wikipedia.org/wiki/Diazomethane

    Diazomethane is an organic chemical compound with the formula CH 2 N 2, discovered by German chemist Hans von Pechmann in 1894. It is the simplest diazo compound . In the pure form at room temperature, it is an extremely sensitive explosive yellow gas ; thus, it is almost universally used as a solution in diethyl ether .

  3. Diazo - Wikipedia

    en.wikipedia.org/wiki/Diazo

    Solid state structure of the diazo compound t-BuO 2 CC(N 2)C 6 H 4 NO 2. Key distances: C-N = 1.329 Å, N-N = 1.121 Å. [12] The mechanism involves attack of the enolate at the terminal nitrogen, proton transfer, and expulsion of the anion of the sulfonamide. Use of the β-carbonyl aldehyde leads to a deformylative variant of the Regitz ...

  4. CH2N2 - Wikipedia

    en.wikipedia.org/wiki/CH2N2

    Diazomethane, chemical compound discovered in 1894 Isodiazomethane , parent compound of a class of derivatives of general formula R2N–NC Nitrilimine , class of organic compounds sharing a common functional group with the general structure R-CN-NR

  5. Lewis structure - Wikipedia

    en.wikipedia.org/wiki/Lewis_structure

    Expressing resonance when drawing Lewis structures may be done either by drawing each of the possible resonance forms and placing double-headed arrows between them or by using dashed lines to represent the partial bonds (although the latter is a good representation of the resonance hybrid which is not, formally speaking, a Lewis structure).

  6. Nierenstein reaction - Wikipedia

    en.wikipedia.org/wiki/Nierenstein_reaction

    If excess diazomethane is present during the reaction, it can act as a base, abstracting a hydrogen from the diazonium-salt intermediate. The result is a neutral diazoketone, which does not react with the chloride. Instead, the byproduct, diazonium-methyl from the other diazomethane molecule, can be attacked by the chloride to produce ...

  7. Büchner–Curtius–Schlotterbeck reaction - Wikipedia

    en.wikipedia.org/wiki/Büchner–Curtius...

    In the reaction between o-nitropiperonal (IX) and diazomethane, an aryl shift leads to production of the epoxide (X) in 9 to 1 excess of the ketone product (XI). When diazoethane is substituted for diazomethane, a hydride shift produces the ketone (XII), the only isolable product. [26] Effect of Diazoalkane on Migratory Preferences

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  9. Hückel method - Wikipedia

    en.wikipedia.org/wiki/Hückel_method

    Delocalization energy is defined as the difference in energy between that of the most stable localized Lewis structure and the energy of the molecule computed from Hückel theory orbital energies and occupancies. Since all energies are relative, we set = without loss of generality to simplify discussion. The energy of the localized structure is ...