Radical reactions with organic halides

The radiation chemical investigations on die nature of OH radical reaction with organic halides has been die subject of ciaient interest [109,110] particularly with aromatic halides containir dectron donating substitiients [111-136]. The measurement of the rate constants, the oxidation of OH-adduct various... 

Radical, Anion, Anion-Radical Reactions with Organic Halides... 

Fukuyama T, Kobayashi M, Rahman MT et al (2008) Spurring radical reactions of organic halides with tin hydride and TTMSS using microreactors. Org Lett 10 533-536... 

Figure 4, Correlations of anion, radical, and radical anion reactions with organic halides and the halide effect...

Xl.1.2 Chemiluminescent Reactions of Electrogenerated Radical Anions with Organic Halides. 

In this section indirect methods will be explored. One was given in Section 3.6. There, data were presented for two members of a large family of reactions of the phenyl radical with organic halides. Pairs of halides were used, and the ratio of two competing products was determined. Expanding the general scheme of Eq. (5-1) further, to use a pair of competing traps, we have... 

G. Reactions of Trifluoromethyl Radicals with Organic Halides. 189... 

A large body of absolute kinetic data, obtained by laser flash photolysis techniques, for the reactions of EtsSi radicals with organic halides is available... 

Benzylpalladation.11 Benzyl halides do not undergo usual radical cyclizations effected with organic halides, but do undergo Pd-catalyzed cyclization with alkenes and alkynes. A typical reaction is formulated in equation (I). The leaving group can also be Br, I, or OMs, but not OCOOCH3 or OCOCH3. Attempts to cyclize 1 with... 

Radical reductions of alkyl halides in water.1 Radical reactions with Bu3SnH are limited to organic solvents, but this tin hydride (1) is sufficiently soluble in water to reduce alkyl bromides or iodides under free-radical conditions in water or in organic solvents. 

We thus have evidence that the differences between bond energies vary in simple hydro-carbons and in substituted hydrocarbons but so far this leaves us in the dark as to the variations of the individual values. Definite indications—if only of an approximate nature—of wide variations in bond energies were first postulated by Ogg and Polanyi from the variations in the rates of reaction between organic halides and sodium vapour observed by Hartel and Polanyi.More recently H. S. Taylor and Smith derived similar conclusions from the marked variations in the rate of reaction of methyl radicals with hydrocarbons. A fall in the bond energy of C—H was quite recently confirmed and quantitatively fixed by more direct methods. D. P. Stevenson has given the values as D CHs—H) = loi and D CjH5—H) = 96 while independently and by different methods Anderson, Kistiakowsky and van Arstdalen obtain D(CH3—H) = 102 and D(C H5—H) = 98 kcal. 

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