A
chemical reaction of two or more reacting
molecular entities, resulting in a single reaction product containing all atoms of all components,
with formation of two chemical bonds and a net reduction in bond multiplicity in at
least one of the reactants. The reverse process is called an
elimination reaction. The addition may occur at only one site (
α-addition, 1/1/addition), at two adjacent sites (1/2/addition) or at two non-adjacent sites
(1/3/- or 1/4/addition, etc.). For example:
If the
reagent or the source of the addends of an addition are not specified, then it is called
an addition
transformation.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1081
