A
transformation by which one
molecular entity (the
substrate ) is converted into another by the formation of one (and only one) two-centre
bond between the substrate and another molecular entity and which involves no other changes
in
connectivity in the substrate. For example, the formation of an acyl
cation by attachment of carbon monoxide to a
carbenium ion (
R+):
The product of an attachment may also be the
adduct of the two reactants, but not all adducts can be represented as the products of an
attachment. (For example, the Diels–Alder
cycloaddition:
results in an
adduct of buta-1,3-diene and ethene, but the reaction cannot be described as an attachment
since bonds are formed between more than two centres.)
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1086
InChI=1/C6H10/c1-2-4-6-5-3-1/h1-2H,3-6H2
InChI=1/C4H6/c1-3-4-2/h3-4H,1-2H2
InChI=1/C2H4/c1-2/h1-2H2
HGCIXCUEYOPUTN-UHFFFAOYAQ
KAKZBPTYRLMSJV-UHFFFAOYAZ
VGGSQFUCUMXWEO-UHFFFAOYAE
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
