Reagent

A reagent ( /riˈeɪdʒənt/) is a "substance or compound that is added to a system in order to bring about a deletal reaction, or added to see if a reaction occurs." Although the terms reactant and reagent are often used interchangeably, a reactant is less specifically a "substance that is consumed in the course of a chemical reaction". Solvents, although they are involved in the reaction, are usually not referred to as reactants. Similarly, catalysts are not consumed by the reaction, so are not described as reactants.

In organic chemistry, reagents are compounds or mixtures, usually composed of inorganic or small organic molecules, that are used to affect a transformation on an organic substrate. Examples of organic reagents include the Collins reagent, Fenton's reagent, and Grignard reagent. There are also analytical reagents which are used to confirm the presence of another substance. Examples of these are Fehling's reagent, Millon's reagent and Tollens' reagent.

In another use of the term, when purchasing or preparing chemicals, reagent-grade describes chemical substances of sufficient purity for use in chemical analysis, chemical reactions or physical testing. Purity standards for reagents are set by organizations such as ASTM International or the American Chemical Society. For instance, reagent-quality water must have very low levels of impurities like sodium and chloride ions, silica, and bacteria, as well as a very high electrical resistivity.

Other articles related to "reagent":

Stryker's Reagent
... Stryker's reagent (6), also known as the Osborn complex, is a hexameric copper hydride ligated with triphenylphosphine ... Stryker's reagent is a mild source of hydride and is used in homogeneous catalysis of conjugate reduction reactions of enones, enoates, and related substrates ...
California Mastitis Test - Use
... An equal volume of test reagent is added, and gently agitated ... A special reagent for the test is marketed under the name 'CMT-Test', but domestic detergents are frequently used instead, being cheaper and more readily available ... Fairy Liquid is as suitable as a reagent for the CMT, although many cheaper detergents are not ...
Bakthan Singaram - Research Interests - TarB-X Reagent
... In conjunction with their work on the LAB reagent, Singaram's laboratory developed the chiral lewis acid/asymmetric reducing agent TarB-X, also known as "Singaram's reagent" ... a new type of chiral Lewis acid and the authors note that "because the reagent is easily prepared, induces high enantioselectivity, and can be essentially fully recovered, the implications for its use in both ...
Stryker's Reagent - Applications in Organic Synthesis
... This reagent was assigned as the "Reagent of the year" in 1991 for its functional group tolerance, high overall efficiency, and mild reaction conditions in the reduction ... Stryker's reagent is used in a catalytic amount where it is regenerated in the reaction in situ using a stoichiometric hydride source, often being molecular hydrogen or silanes ... not destroy its activity significantly, although solvents used with Stryker's reagent should be rigorously degassed ...