metathesis

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metathesis

 [mĕ-tath´ĕ-sis]
1. artificial transfer of a morbid process.
2. a chemical reaction in which an element or radical in one compound exchanges places with another element or radical in another compound.

me·tath·e·sis

(me-tath'ĕ-sis),
1. Transfer of a pathologic product (for example, a calculus) from one place to another where it causes less inconvenience or injury, when it is not possible or expedient to remove it from the body.
2. In chemistry, a double decomposition, wherein a compound, A-B, reacts with another compound, C-D, to yield A-C + B-D, or A-D + B-C.
[meta- + G. thesis, a placing]

me·tath·e·sis

(me-tath'ĕ-sis)
1. Transfer of a pathologic product (e.g., a calculus) from one place to another where it causes less inconvenience or injury, when it is not possible or expedient to remove it from the body.
2. chemistry A double decomposition, wherein a compound, A-B, reacts with another compound, C-D, to yield A-C + B-D, or A-D + B-C.
[meta- + G. thesis, a placing]
References in periodicals archive ?
The discovery was made by a team of Boston College and MIT (Massachusetts Institute of Technology) scientists, who found catalysts that promote the powerful olefin metathesis reaction.
By targeting the carbon-carbon double bond, which is usually difficult to break, metathesis reactions provide "a new way to link molecules together," says Ronald Breslow, a chemist at Columbia University and Grubbs' Ph.D.
Chapter topics include alkylation and allylation adjacent to a carbonyl group, asymmetric alkylation or aminatin of allylic esters, Suzuki, Beck and Sonogashira coupling reactions, cross-coupling reactions, regioselective or asymmetric 1,2-addition to aldehydes, olefin metathesis reactions, cyclization reactions, asymmetric aldol and Michael reactions, and steroeselective hydroformylation, carbonylation and carboxylation reactions.