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Hydrogen Atom Abstraction and Addition Reactions of Charged Phenyl Radicals with Aromatic Substrates in the Gas Phase by Luis E. Ramı́rez-Arizmendi; Leo Guler; Joseph J. Ferra Jr; Kami K. Thoen; Hilkka I. Kenttämaa is a Chemistry article available to read on EtoBox.
What is Hydrogen Atom Abstraction and Addition Reactions of Charged Phenyl Radicals with Aromatic Substrates in the Gas Phase about?
In order to investigate competition between radical substitution and addition reactions, the gas-phase reactivity of phenyl radicals bearing a chemically inert, positively charged group and a neutral substituent (CH 3 , Cl, or Br), both at a meta position with respect to the radical site, was examined toward several aromatic substrates in a dual-cell Fourier transform ion cyclotron resonance mass spectrometer. The radicals undergo hydrogen atom abstraction from the substituent and/or addition to the phenyl ring of benzeneselenol, thiophenol, benzaldehyde, toluene, aniline, and phenol. The presence of an electronwithdrawing substituent Cl or Br on the phenyl ring of the radical slightly increases the rates for both hydrogen atom abstraction and addition due to favorable polarization of the reactions' transition states. The observation of a stable ion-molecule addition product in most reactions was unexpected since in a low-pressure gas-phase environment, adducts are typically unable to release their excess energy before dissociation to products or back to reactants. However, the addition products discussed here are low in energy [addition is exothermic by 24 -30 kcal/mol; B3LYP/6-31
Who reads Hydrogen Atom Abstraction and Addition Reactions of Charged Phenyl Radicals with Aromatic Substrates in the Gas Phase?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- Luis E. Ramı́rez-Arizmendi; Leo Guler; Joseph J. Ferra Jr; Kami K. Thoen; Hilkka I. Kenttämaa
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 1387-3806)
- Published
- 2001
- Language
- EN
- Field
- Chemistry (Physical Sciences)