enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Cyclohexane conformation - Wikipedia

    en.wikipedia.org/wiki/Cyclohexane_conformation

    Cis-1,4-Di-tert-butylcyclohexane has an axial tert-butyl group in the chair conformation and conversion to the twist-boat conformation places both groups in more favorable equatorial positions. As a result, the twist-boat conformation is more stable by 0.47 kJ/mol (0.11 kcal/mol) at 125 K (−148 °C) as measured by NMR spectroscopy. [9]

  3. Rotamer - Wikipedia

    en.wikipedia.org/wiki/Rotamer

    The repulsion between an axial t-butyl group and hydrogen atoms in the 1,3-diaxial position is so strong that the cyclohexane ring will revert to a twisted boat conformation. The strain in cyclic structures is usually characterized by deviations from ideal bond angles ( Baeyer strain ), ideal torsional angles ( Pitzer strain ) or transannular ...

  4. Cyclohexane - Wikipedia

    en.wikipedia.org/wiki/Cyclohexane

    The chair and twist-boat are energy minima and are therefore conformers, while the half-chair and the boat are transition states and represent energy maxima. The idea that the chair conformation is the most stable structure for cyclohexane was first proposed as early as 1890 by Hermann Sachse, but only gained widespread acceptance much later.

  5. Ring flip - Wikipedia

    en.wikipedia.org/wiki/Ring_flip

    The chair conformation minimizes both angle strain and torsional strain by having all carbon-carbon bonds at 110.9° and all hydrogens staggered from one another. [2] The conformational changes that occur in a cyclohexane ring flip take place over several stages. Structure D (10.8 kcal/mol) is the highest energy transition state of the process.

  6. Fluxional molecule - Wikipedia

    en.wikipedia.org/wiki/Fluxional_molecule

    Cyclohexane chair flip (ring inversion) reaction via boat conformation [8] The interconversion of equivalent chair conformers of cyclohexane (and many other cyclic compounds) is called ring flipping. Carbon–hydrogen bonds that are axial in one configuration become equatorial in the other, and vice versa.

  7. Food poisoning is extremely common. But that doesn't ... - AOL

    www.aol.com/food-poisoning-extremely-common...

    Few things will put a damper on your vacation or holiday faster than food poisoning.The intense stomach pain, rushing to the toilet and feeling relegated to bed keeps just about everyone out of ...

  8. Chloƫ Sevigny Ditches the Red Trend for Something Rustier - AOL

    www.aol.com/chlo-sevigny-ditches-red-trend...

    And to complete the fit, Sevigny slipped into a pair of transparent black tights, as well as a set of golden block heels, also from Saint Laurent, which had square toes and straps around the ankles.

  9. Twistane - Wikipedia

    en.wikipedia.org/wiki/Twistane

    Twistane (IUPAC name: tricyclo[4.4.0.0 3,8]decane [2]) is an organic compound with the formula C 10 H 16. [3] It is a cycloalkane and an isomer of the simplest diamondoid, adamantane, and like adamantane, is not very volatile. Twistane was named for the way its rings are permanently forced into the cyclohexane conformation known as the "twist ...