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N-Bromosuccinimide or NBS is a chemical reagent used in radical substitution, electrophilic addition, and electrophilic substitution reactions in organic chemistry. NBS can be a convenient source of Br • , the bromine radical.
The generation of NBS radicals depicted in the Bloomfield mechanism has been shown to be far more difficult than imagined when it was proposed, which is why it has failed as a proper model throughout the years; however, evidence suggests that the Bloomfield mechanism is still acceptable for the oxidation of alcohols using NBS. [10] In the ...
Hofmann Isonitrile synthesis, Carbylamine reaction; Hofmann product; Hofmann rearrangement; Hofmann–Löffler reaction, Löffler–Freytag reaction, Hofmann–Löffler–Freytag reaction; Hofmann–Martius rearrangement; Hofmann's rule; Hofmann–Sand reaction; Homo rearrangement of steroids; Hooker reaction; Horner–Wadsworth–Emmons ...
Organic reactions can be categorized based on the type of functional group involved in the reaction as a reactant and the functional group that is formed as a result of this reaction. For example, in the Fries rearrangement the reactant is an ester and the reaction product an alcohol .
CHPhCH 2 OSO 3 −, that add further alkenes via formation of C-C bonds. Many styrene and fluoroalkene polymers are produced in this way. In atom transfer radical polymerization (ATRP), carbon-halides reversibly generate organic radicals in the presence of transition metal catalyst. General ATRP Reaction. A. Initiation. B. Equilibrium with ...
Achmatowicz reaction; Acylation; Adamkiewicz reaction; Adams decarboxylation; Alkene carboamination; Alkenylaluminium compounds; Alkylation; Carbonyl condensation; Allylic stannane addition; Alpha cleavage; Amination; Amine alkylation; Amino acid N-carboxyanhydride; Aminoacylation; Armed and disarmed saccharides; Asymmetric addition of ...
Allylic shifts become the dominant reaction pathway when there is substantial resistance to a normal (non-allylic) substitution. For nucleophilic substitution, such resistance is known when there is substantial steric hindrance at or around the leaving group, or if there is a geminal substituent destabilizing an accumulation of positive charge.
The Negishi coupling is a widely employed transition metal catalyzed cross-coupling reaction. The reaction couples organic halides or triflates with organozinc compounds, forming carbon-carbon bonds (C-C) in the process. A palladium (0) species is generally utilized as the catalyst, though nickel is sometimes used.