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Diradical — Not to be confused with biradical. A diradical in organic chemistry is a molecular species with two electrons occupying two degenerate molecular orbitals (MO).[1][2] They are known by their higher reactivities and shorter lifetimes. In a broader… … Wikipedia
diradical — /duy rad i keuhl/, n. Chem. an atom or molecule having two unpaired electrons. Also called biradical. Cf. free radical. [DI 1 + RADICAL] * * * … Universalium
diradical — di·radical … English syllables
diradical — (ˈ)dī+ noun ( s) Etymology: di + radical : biradical * * * /duy rad i keuhl/, n. Chem. an atom or molecule having two unpaired electrons. Also called biradical. Cf. free radical. [DI 1 + RADICAL] … Useful english dictionary
Radical (chemistry) — Free radical redirects here. For other uses, see Free radical (disambiguation). Moses Gomberg (1866 1947), the founder of radical chemistry Radicals (often referred to as free radicals) are atoms, molecules, or ions with unpaired electrons on an… … Wikipedia
1,3-Dipolar cycloaddition — The 1,3 dipolar cycloaddition, also known as the Huisgen cycloaddition or Huisgen reaction, [1][2] is an organic chemical reaction belonging to the larger class of concerted, pericyclic cycloadditions. It is the reaction between a 1,3 dipole and… … Wikipedia
Cope rearrangement — The Cope rearrangement is an extensively studied organic reaction involving the [3,3] sigmatropic rearrangement of 1,5 dienes.[1][2][3][4] It was developed by Arthur C. Cope. For example 3 methyl 1,5 hexadiene heated to 300°C yields 1,5… … Wikipedia
Aryne — In chemistry, an aryne is an uncharged reactive intermediate derived from an aromatic system by removal of two ortho substituents, leaving two orbitals with two electrons distributed between them.[1] [2]. In analogy with carbenes and nitrenes, an … Wikipedia
Viologen — The Viologens are diquaternary derivatives of 4,4 bipyridyl. The name comes from the fact that this class of compounds is easily reduced to the radical mono cation, which is intensely blue coloured. In an experimental electrolysis setup, viologen … Wikipedia
Non-Kekulé molecule — Examples of non Kekulé (a) polyenes, (b) quinodimethanes, and (c) polynuclear aromatics A non Kekulé molecule is a conjugated hydrocarbon that cannot be assigned classical Kekulé structures. Since non Kekulé molecules have two or more formal… … Wikipedia
