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In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical reaction occurs. [ 1] A chemical mechanism is a theoretical conjecture that tries to describe in detail what takes place at each stage of an overall chemical reaction. The detailed steps of a reaction are not observable in most cases.
Category. : Reaction mechanisms. In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical change occurs. Wikimedia Commons has media related to Reaction mechanisms.
RXNO:0000032. In organic chemistry, the Mannich reaction is a three-component organic reaction that involves the amino alkylation of an acidic proton next to a carbonyl ( C=O) functional group by formaldehyde ( H−CHO) and a primary or secondary amine ( −NH2) or ammonia ( NH3 ). [ 1] The final product is a β-amino-carbonyl compound also ...
In organic chemistry, free-radical addition is an addition reaction which involves free radicals. Radical additions are known for a variety of unsaturated substrates, both olefinic or aromatic and with or without heteroatoms. Free-radical reactions depend on one or more relatively weak bonds in a reagent. Under reaction conditions (typically ...
Arrow pushing or electron pushing is a technique used to describe the progression of organic chemistry reaction mechanisms. [ 1] It was first developed by Sir Robert Robinson. In using arrow pushing, "curved arrows" or "curly arrows" are drawn on the structural formulae of reactants in a chemical equation to show the reaction mechanism.
Reactive intermediate. In chemistry, a reactive intermediate or an intermediate is a short-lived, high-energy, highly reactive molecule. When generated in a chemical reaction, it will quickly convert into a more stable molecule. Only in exceptional cases can these compounds be isolated and stored, e.g. low temperatures, matrix isolation.
Sigmatropic reaction. A sigmatropic reaction in organic chemistry is a pericyclic reaction wherein the net result is one σ-bond is changed to another σ-bond in an uncatalyzed intramolecular reaction. [1] The name sigmatropic is the result of a compounding of the long-established sigma designation from single carbon –carbon bonds and the ...
In coordination chemistry, the SN1cB (conjugate base) mechanism describes the pathway by which many metal amine complexes undergo substitution, that is, ligand exchange. Typically, the reaction entails reaction of a polyamino metal halide with aqueous base to give the corresponding polyamine metal hydroxide: [1] The rate law for the reaction is ...