Abstract
In chemistry, metathesis refers to the interchange of atoms between two molecules. In olefin chemistry, it describes the interchange of carbon atoms between a pair of double bonds. Olefin metathesis reactions fall into three broad groups in which the overall chemistry is represented by equations undergoing exchange, ring-opening metathesis polymerization, and ring-closing metathesis. The reactions are generally reversible and, with the fight catalyst system, equilibrium can be attained in a matter of seconds, even with substrate/catalyst ratios of 104―a truly remarkable reaction. The olefin metathesis reaction clearly provides a route for the establishment of equilibrium between all species formed by exchange of alkylidene moieties. Thermodynamic data may therefore be used to predict the ultimate equilibrium position. Alternatively, experimental equilibrium concentrations may be used to provide new thermodynamic data and to check existing data.
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