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{{short description|Chemical reaction which forms a cyclic molecule}}
[[File:Non-ionic Cycloadditions.png|thumb|261x261px|Non-ionic Cycloadditions]]
In [[organic chemistry]], a '''cycloaddition''' is a [[chemical reaction]] in which "two or more [[Unsaturated hydrocarbon|unsaturated]] molecules (or parts of the same molecule) combine with the formation of a cyclic [[adduct]] in which there is a net reduction of the [[Multiplicity (chemistry)#Molecules|bond multiplicity]]". The resulting reaction is a [[cyclization]] reaction. Many but not all cycloadditions are [[Concerted reaction|concerted]] and thus [[pericyclic]].<ref name="goldbook">{{Citation|title=cycloaddition|url=https://goldbook.iupac.org/html/C/C01496.html|work=IUPAC Compendium of Chemical Terminology|year=2009|publisher=IUPAC|doi=10.1351/goldbook.C01496|isbn=978-0-9678550-9-7|access-date=2018-10-13|doi-access=free|url-access=subscription}}</ref> Nonconcerted cycloadditions are not pericyclic.<ref>{{Citation|title=pericyclic reaction|url=https://goldbook.iupac.org/html/P/P04491.html|work=IUPAC Compendium of Chemical Terminology|year=2009|publisher=IUPAC|doi=10.1351/goldbook.P04491|isbn=978-0-9678550-9-7|access-date=2018-10-13|doi-access=free|url-access=subscription}}</ref> As a class of [[addition reaction]], cycloadditions permit carbon–carbon bond formation without the use of a [[nucleophile]] or [[electrophile]].
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