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NBS will react with alkenes 1 in aqueous solvents to give bromohydrins 2. The preferred conditions are the portionwise addition of NBS to a solution of the alkene in 50% aqueous DMSO, DME, THF, or tert-butanol at 0 °C. [3] Formation of a bromonium ion and immediate attack by water gives strong Markovnikov addition and anti stereochemical ...
In the Goldfinger mechanism, the purpose of the NBS is simply to maintain a very low concentration of molecular bromine, while in the Bloomfield mechanism, its purpose is the generation of the initial radical used in the reaction, [11] which again can be quite a difficult process. [12]
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 .
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 ...
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 ...
The reaction is named after Ei-ichi Negishi who was a co-recipient of the 2010 Nobel Prize in Chemistry for the discovery and development of this reaction. Negishi and coworkers originally investigated the cross-coupling of organoaluminum reagents in 1976 initially employing Ni and Pd as the transition metal catalysts, but noted that Ni ...
a Diels-Alder reaction. Alkenes add to dienes to give cyclohexenes. This conversion is an example of a Diels-Alder reaction. Such reaction proceed with retention of stereochemistry. The rates are sensitive to electron-withdrawing or electron-donating substituents. When irradiated by UV-light, alkenes dimerize to give cyclobutanes. [20]