diradical (biradical)

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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 — (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

• biradical — /buy rad i keuhl/, n. Chem. diradical. [BI 1 + RADICAL] * * * …   Universalium

• 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

• biradical — (ˈ)bī+ noun Etymology: bi (I) + radical : a free radical or compound (as sulfur monoxide .SO.) with two unpaired electrons * * * /buy rad i keuhl/, n. Chem. diradical. [BI 1 + RADICAL] …   Useful english dictionary

• 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

• Bergman cyclization — The Bergman cyclization or Bergman reaction or Bergman cycloaromatization is an organic reaction and more specifically a rearrangement reaction taking place when an enediyne is heated in presence of a suitable hydrogen donor ( Scheme 1 ) [ p… …   Wikipedia

• Favorskii rearrangement — The Favorskii rearrangement (not to be confused with the Favorskii reaction), named for the Russian chemist Alexei Yevgrafovich Favorskii , is most principally a rearrangement of cyclopropanones and α halo ketones which leads to carboxylic acid… …   Wikipedia

• Allotropes of sulfur — There are a large number of allotropes of sulfur. In this respect, sulfur is second only to carbon.[1] The most common form found in nature is yellow orthorhombic α sulfur, which contains puckered rings of S8.[1] Chemistry students may have seen… …   Wikipedia

• Oxocarbon — An oxocarbon or oxide of carbon is an inorganic compound consisting only of carbon and oxygen.[1][2] The simplest and most common oxocarbons are carbon monoxide (CO) and carbon dioxide (CO2). Many other stable or metastable oxides of carbon are… …   Wikipedia