Addition Reaction

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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 ?
as illustrated by the rales of consumption of the active hydrogen atoms of BTA via the competitive Michael addition reaction (corresponding to the term [K.
Vinyl (1,2) microstructure dominates the poly(butadiene) resin (90% of monomer units), and addition reactions may dominate the cure mechanism.
5-7) Commercial ASPE-based diamines are derived from the Michael addition reaction between aliphatic diamines and diethyl maleate (DEM).
This is followed by the conjugate addition reaction of this nucleophile (BTA9) with the electrophilic BMI to form BTA-[BMI.
Type I coagents are typically polar, multifunctional low molecular weight compounds which form very reactive radicals through addition reactions.
This issue covers reactions of aldehydes and ketones and their derivatives; reactions of carboxylic, phosphoric and sulfonic acids and their derivatives; oxidation and reduction; carbenes and nitrenes; nucleophilic and electrophilic aromatic substitution; carbocations; nucleophilic aliphatic substitution; carbanions and electrophilic aliphatic substitution; elimination reaction; addition reactions (polar addition and cycloaddition); and molecular rearrangements.
The R groups attached to the carbodiimide functionality determine selectively what type of addition reactions occur and under what kinetically driven conditions.
The kinetic model simulation has to be able to either describe the complete cross-linking process phenomenologically (4) or mechanistically (5-7) including homolytic cleavage of the peroxide, beta cleavage of the oxy radical, hydrogen abstraction, addition reactions, radical coupling (cross-link formation), polymer scission, and radical transfer for a wide range of compositions and an assortment of elastomers, using a single set of rate constants.
The general shortcoming of this type of kinetic models is the inability lo distinguish among several possible cross-linking reaction sites such as hydrogen aroms bonded to aliphatic carbon atom and double bonds, which are subjected lo hydrogen abstraction and addition reactions, respectively.
The grafting of acrylic acid to the co-oligomer succeeded by radical addition reactions between the double bonds of BuAA and acrylic acid, and also by addition reactions between the acrylic rests.
A mechanism of reaction is proposed with the formation of crosslinked structures involving free-radical double bond addition reactions.
The Formation of Carbon-Sulfur and Carbon-Selenium Bonds by Substitution and Addition Reactions Catalyzed by Transition Metal Complexes