nucleophile

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nucleophile

[′nü·klē·ə‚fīl]
(physical chemistry)
A species possessing one or more electron-rich sites, such as an unshared pair of electrons, the negative end of a polar bond, or pi electrons. Also known as electron donor.
References in periodicals archive ?
Moreover, using suitable reactive systems the higher fixation levels are possible due to presence of both nucleophilic substitution (triazinyl) and addition (vinyl sulphone) bonds, which improve the fastness characteristic and resistance toward acid, alkali and peroxide [8, 9].
The analyses subsequently focused on the three largest chemical reactivity groups in the present dataset; nucleophilic substitution (SN), Michael addition (MA) and Schiff base (SB) formation.
These primary amine groups become readily available to undergo nucleophilic attack on oxirane groups of DGEBA, which results in secondary amine groups and increase in the hydroxyl groups (shown in Fig.
First, the oxygen of the glycosidic bond is protonated by the carboxylic acid of an acidic amino acid followed by the formation of the oxazolinium ion intermediate by the nucleophilic attack of the amide carbonyl group to the anomeric center.
5) They proposed that primary and secondary amines catalyzed the reactions by nucleophilic attack on silicon which was followed by the rapid attack of dialkylsilanediol on the silamine formed, as shown in Figure 10.
This curing temperature is lowered with crosslinking catalysts such as cyclic aliphatic tertiary amine and a heteroaryl or a tertiary nucleophilic organophosphorus compound.
All six families appear to use the same, two-step reaction mechanism based on a catalytic triad of residues (usually Ser-His-Asp/Glu) that generates a charge relay system and a highly nucleophilic serine.
The book covers structural features of carbohydrates, including cyclization and conformation preferences and their energetics, then moves on to nucleophilic reaction at the anomeric center, glycoside hydrolysis, and transglycosylation.
The synthesis of VALPOx with active free carboxylic acid groups was achieved from the nucleophilic displacement reaction of oxadiazole-activated bis(fluoride) monomer with 4,4This(4-hydroxyphenyl) valeric acid.
The amino group is ready-made nucleophilic center for the synthesis of condensed heterocyclic ring [4-5].
E-BODIPY compounds offer the potential for further modification when the substituting nucleophile is an ethynyl group, including nucleophilic addition to and polymerization of the compound at the alkyne site (Goze et al.
Their biochemical persistence to nucleophilic attack, low aqueous solubility promote their accumulation in the solid phases of the sediments.