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  2. Radical (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Radical_(chemistry)

    Lewis dot structure of a Hydroxide ion compared to a hydroxyl radical. In chemistry, a radical, also known as a free radical, is an atom, molecule, or ion that has at least one unpaired valence electron. [1] [2] With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most ...

  3. Category:Free radicals - Wikipedia

    en.wikipedia.org/wiki/Category:Free_radicals

    Download as PDF; Printable version; ... Pages in category "Free radicals" ... Free radical; Radical (chemistry) * Disposable soma theory of aging; Free-radical theory ...

  4. Trivalent group 14 radicals - Wikipedia

    en.wikipedia.org/wiki/Trivalent_group_14_radicals

    A trivalent group 14 radical (also known as a trivalent tetrel radical) is a molecule that contains a group 14 element (E = C, Si, Ge, Sn, Pb) with three bonds and a free radical, having the general formula of R 3 E•. Such compounds can be categorized into three different types, depending on the structure (or equivalently the orbital in which ...

  5. 1,2-rearrangement - Wikipedia

    en.wikipedia.org/wiki/1,2-rearrangement

    An example of a less common radical 1,2-shift can be found in the gas phase pyrolysis of certain polycyclic aromatic compounds. [4] The energy required in an aryl radical for the 1,2-shift can be high (up to 60 kcal / mol or 250 kJ /mol) but much less than that required for a proton abstraction to an aryne (82 kcal/mol or 340 kJ/mol).

  6. Free-radical reaction - Wikipedia

    en.wikipedia.org/wiki/Free-radical_reaction

    A free-radical reaction is any chemical reaction involving free radicals. This reaction type is abundant in organic reactions . Two pioneering studies into free radical reactions have been the discovery of the triphenylmethyl radical by Moses Gomberg (1900) and the lead-mirror experiment [ 1 ] described by Friedrich Paneth in 1927.

  7. Stable phosphorus radicals - Wikipedia

    en.wikipedia.org/wiki/Stable_phosphorus_radicals

    The most common method for accessing radical anions is through the use of reducing agents. Synthesis of phosphorus-centred radical anion via reduction usgin K or Li by Wang and co-workers. Synthesis of diphosphorus-centred radical anion and the di-radical di-anion via reduction with KC8 by Wang and co-workers.

  8. Persistent radical effect - Wikipedia

    en.wikipedia.org/wiki/Persistent_radical_effect

    The persistent radical effect (PRE) in chemistry describes and explains the selective product formation found in certain free-radical cross-reactions. In these type of reactions, different radicals compete in secondary reactions. The so-called persistent (long-lived) radicals do not self-terminate and only react in cross-couplings.

  9. Radical clock - Wikipedia

    en.wikipedia.org/wiki/Radical_clock

    In chemistry, a radical clock is a chemical compound that assists in the indirect methodology to determine the kinetics of a free-radical reaction. The radical-clock compound itself reacts at a known rate, which provides a calibration for determining the rate of another reaction.

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