Addition Reaction


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Related to Addition Reaction: elimination reaction, Substitution reaction

addition reaction

[ə′di·shən rē′ak·shən]
(organic chemistry)
A type of reaction of unsaturated hydrocarbons with hydrogen, halogens, halogen acids, and other reagents, so that no change in valency is observed and the organic compound forms a more complex one.

Addition Reaction

 

one of the main types of chemical reaction in which a single new substance is formed from two or more individual substances, for example, NH3 + HCl = NH4Cl. Addition reactions include many reactions involving the recombination of atoms and radicals (H + H = H2 and CH3 + C2H5 = C3H8), reactions involving the addition of halogens to unsaturated aromatic compounds (C6H6 + 3C12 = C6H6C16), reduction reactions (C2H4 + H2 = C2H6), and reactions for the formation of complex compounds. Addition reactions are often intermediate steps in complex chemical processes.

References in periodicals archive ?
Initially, to evaluate the catalytic activity of Feist's acid for the Michel addition reaction, indole 4 and [beta]-nitrostyrene 2a have been chosen as model substrates.
Although chiral ethers-crown are more resistant to decomposition and have been used successfully, for example, in asymmetric Michael addition reactions, their high cost makes impracticable their use in industrial scale [8].
After the Michael addition reaction was complete as demonstrated by NMR, polyesterification was performed by increasing the reaction temperature to 120[degrees]C, adding 0.3 wt% titanium butoxide catalyst and applying reduced pressure (ca.
Table-2: Addition reaction of 2-Mercapto-5-Methyl- [1, 3, 4] thiadiazde with oleic acid in the presence of catalyst
Recently, we have developed a mechanistic model that adequately predicted the Michael addition polymerization of BMI with BTA in the temperature range 383-423 K with the aid of adding sufficient HQ to completely suppress the free radical polymerization (5), This approach is capable of decoupling the rather complicated competitive Michael addition reaction and free radical polymerization mechanisms, thereby leading to the true key kinetic parameters such as the reaction rate constants and activation energy for the Michael addition reaction polymerization.
In the case of less bulky and especially bisphosphine chelating ligands, different types of 14-electron Pd[L.sub.2] complexes have been postulated as active catalysts, and corresponding products of the oxidative addition reactions to such complexes have been characterised [37-40].
The three new adhesive types are two-component, colorless and transparent silicone gels that crosslink via a platinum-catalyzed addition reaction to form soft, highly flexible materials with an elastic, gel-like consistency.
It is miscible in xylene with the PDMS containing vinyl group of 10 mol% and the HSO to prepare easily the CHM by silicon-hydrogen addition reaction at room temperature by means of casting solution method.
Caption: FIGURE 1: Free energy profile for the [3 + 2] and [2 + 2] addition reaction between CpCo[(NO).sub.2] and ethylene.
Ammonium chloride which is inexpensive and readily available reagent catalyzes the thia-michael addition reaction of thiols in water efficiently.
With the reactive bismaleimide groups (two terminal -C=C-groups), BMI can polymerize with active hydrogen atom-containing species such as polyamines via the Michael addition reaction mechanism (1-6).