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 groupscontained within the same molecular entity.
This is a general term that, whenever appropriate, should be used in preference to the less explicit term complex. It is also used specifically for products of an addition reaction.