6 articles
Neighboring group participation
Neighboring group participation, or anchimeric assistance, is the interaction of a reaction center with a lone pair or bond electrons within the same molecule, accelerating substitution.
Nucleophile
A nucleophile is a chemical species that donates an electron pair to bond with an electron-poor electrophile, playing a central role in organic substitution reactions.
Nucleophilic acyl substitution
Nucleophilic acyl substitution is the reaction in which a nucleophile replaces the leaving group on a carbonyl carbon, converting one carboxylic acid derivative into another.
Nucleophilic substitution
Nucleophilic substitution is an organic reaction in which a nucleophile replaces a leaving group on a substrate, proceeding mainly by the SN1 and SN2 mechanisms.
SN1 reaction
The SN1 reaction, or unimolecular nucleophilic substitution, is a two-step nucleophilic substitution that proceeds through a carbocation intermediate. Its rate depends only on substrate concentration, so tertiary substrates react fastest.
SN2 reaction
The SN2 reaction, or bimolecular nucleophilic substitution, is a concerted organic reaction, formulated by Hughes and Ingold in 1937, in which a nucleophile attacks from behind a leaving group, inverting the stereochemistry.