Term: adduct
https://doi.org/10.1351/goldbook.A00138

Definition:
A new chemical species AB, each molecular entity of which is formed by direct combination of two separate molecular entities A and B in such a way that there is change in connectivity, but no loss, of atoms within the moieties A and B. Stoichiometries other than 1:1 are also possible, e.g. a bis-adduct (2:1). An intramolecular adduct can be formed when A and B are groups contained within the same molecular entity. This is a general term which, whenever appropriate, should be used in preference to the less explicit term complex. It is also used specifically for products of an addition reaction. For examples, see Lewis adduct, Meisenheimer adduct, π-adduct.

Related Terms:
1) chemical species (http://doi.org/10.1351/goldbook.CT01038).
2) molecular entity (http://doi.org/10.1351/goldbook.M03986).
3) connectivity (http://doi.org/10.1351/goldbook.C01274).
4) moieties (http://doi.org/10.1351/goldbook.M03968).
5) intramolecular adduct (http://doi.org/10.1351/goldbook.I03130).
6) complex (http://doi.org/10.1351/goldbook.C01203).
7) addition reaction (http://doi.org/10.1351/goldbook.A00133).
8) lewis adduct (http://doi.org/10.1351/goldbook.L03510).
9) meisenheimer adduct (http://doi.org/10.1351/goldbook.M03819).
10) π-adduct (http://doi.org/10.1351/goldbook.A04388).

Source: PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1082 (https://doi.org/10.1351/pac199466051077)

Citation: 'adduct' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.A00138

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