organometallic chemistry

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organometallic chemistry,

the reactions and use of a class of compounds (R-M) that contain a covalent bond between carbon and metal. They are prepared either by direct reaction of the metal with an organic compound or by replacement of a metal from another organometallic substance. Their use is based on the polar R-M bond, in which the carbon atom carries a partial negative charge, and on the nature of the metal atom. In synthesis they act as nucleophiles that can bond with relatively positive carbon atoms in compounds such as alkyl halides, aldehydes, and ketones. For example, the Grignard reagent, RMgX (where X equals Br, Cl, or I), and organolithium compounds react with ketones to give secondary alcohols. In industry, butyllithium is used for the polymerization of isoprene in the manufacture of synthetic rubber; metalloorganic compounds serve as catalysts. The semimetals, boron, and silicon are important organometallics; organoboranes are used in synthesis, while organosilicones are polymerized to manufacture plastics and elastomers. Many organometallics are toxic primarily because of the toxicity of the metal. For example tetraethyl leadtetraethyl lead
, (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy.
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 has been banned as gasoline additive and the conversion of mercury to mercury alkyls by fish has had serious consequences in Japan.
References in periodicals archive ?
The acquisition expands Pilot's business into the organometallic fuel additives markets, as well as provides further growth opportunities for Pilot's existing surfactants and antimicrobial businesses.
Organometallic frameworks are classified as a new generation of porous crystalline materials.
Pombeiro presents this extensive research volume commemorating the 2012 International Conference on Organometallic Chemistry (ICOMC).
Chemtura's Organometallic Specialties business is a pioneer in co-catalyst and activator systems.
One of the key focuses for our technology is to increase hydrophobicity and oleophobicity on surfaces and the use of organometallic coatings deposited from a metal alkoxide composition to achieve this is a very interesting application of our technology," said Edward Hughes, CEO of Aculon.
International Resource News-October 19, 2011--Saudi Organometallic Chemicals Company to start building new aluminium alkyls manufacturing facility(C)1994-2011 ENPublishing - http://www.
We believe this is the first example of an organic that can compete with an organometallic in terms of brightness and color-tuning capability," said Kim, an associate professor at the university.
Organometallic compounds; preparation, structure and properties.
Further strategic domains include: - Homogeneous, heterogenous, bio-catalysis - New reactor design including high throughput - Polymer catalysis - Photocatalysis - In situ atomic-scale characterization - Modelization - Inorganic and organometallic synthesis KCC will be a node for international collaboration with the various universities connected with KAUST.
11/985,151 discloses the process required for applying an organometallic film on substrates, particularly polymer substrates, in which the metal of the organometallic has "f" orbital electrons.
Reactions requiring the use of strong acids such as nitric acid (nitrations) or powerful organometallic bases such as butyl lithium (metallations) are now routinely possible in flow chemistry.
Precise controlled atmosphere glove boxes from Labconco maintain a leak-tight, controlled condition environment for applications such as organometallic chemistry, alternative energy cells, or hydrophilic chemicals.