homolysis


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Related to homolysis: heterolysis

homolysis

[hə′mäl·ə·sis]
(organic chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In this reaction mechanism, PCB absorbed photon, activated and dechlorinated by homolysis. The radials then abstract a hydrogen atom from the solvent to from dechlorinated product.
The free-radical photoinitiators used generally undergo Type I photocleavage (bond homolysis) or Type II (hydrogen abstraction) to produce energetic free radicals.
ROO* and HO* were generated by the thermal homolysis of 20 mM 2-2'-azo-bis-(2-methylpropionamidine)-dihydrochloride and from an Fe ascorbate Fenton reaction (Regoli and Winston 1999), respectively.
Ketones undergo homolysis by either fragmentation or photo cleavage and hydrogen abstraction.
In this case, both molecules appear to undergo thermolysis via homolysis, as the electron spin density of the transition state resides only on the [O.sub.1] and [O.sub.4] heteroatoms (Figures 2(c) and 2(d)).
Obviously, as a bimolecular initiator, azo would form two primary radicals via homolysis, in which only the one that is covalently bonded to surface of Ti[O.sub.2] nanoparticles leads to the grafted chains, while that dissolved in solution results in free polymers.
In fact, the homolysis of water was promoted in a restricted volume around the bulb, by the low wavelength line at 185 nm of the Hg spectrum [19, 39]:
Several studies have concluded that polyethylene oxide degrades though the random homolysis of the C--C and C--O bonds in the polymer backbone, via a radical chain mechanism, leading to a reduction in molecular weight (27-30).
In the presence of [H.sub.2][O.sub.2] (sensitized UV) the radiation promotes the homolysis of peroxide generating hydroxyl radicals.