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A metal-centered cycloaddition is a subtype of the more general class of cycloaddition reactions. In such reactions "two or more unsaturated molecules unite directly to form a ring", incorporating a metal bonded to one or more of the molecules. Cycloadditions involving metal centers are a staple of organic and organometallic chemistry, and are involved in many industrially-valuable synthetic processes. For example, olefin metathesis using a Grubbs catalyst typically involves a reversible [2+2] cycloaddition. A Ruthenium alkylidene and an alkene (or alkyne) react to form a metallocycle.
