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metathesis definition

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A bimolecular process formally involving the exchange of a bond (or bonds) between similar interacting chemical species so that the bonding affiliations in the products are identical (or closely similar) to those in the reactants. For example:

(The term has its origin in inorganic chemistry with a different meaning, but this older usage is not applicable in physical organic chemistry .)

See also:

Mie Scattering definition
microenvironment definition
Metastable definition
MFM definition
Microelectronics Manufacturing Science and Technology (MMST) definition