An electron paramagnetic resonance (EPR) technique was used to show that simple alkyl radicals readily abstract hydrogen from l,4-cyclohexadiene. Rate constants for the reaction were ca. 104-105 M-' s-' at 300 K and activation energies 5-7 kcal mol-'. For the stabilized radicals, ally1 and benzyl, t
The question of the validity of using radical probes for determining SET. The reaction of alkyl halides with LiAlH4.
β Scribed by E.C. Ashby; Tung N. Pham
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- French
- Weight
- 237 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0040-4039
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Evidence for a radical process in' the reaction of lithium alkoxides with alkyl iodides was obtained by the observation of cyclization of appropriate radical probes, by the trapping of radicals, and by EPR spectroscopic observations relating to the one electron donor properties of alkoxides.
An upper limit for the reaction rate of CO with the nitrate radical NO, has been determined equal to 4 x lo-'' cmt3 molec-' s-' a t 295 ? 2 K. In the experiment the isotopic species C13016 and C13018 mixed at 1-2 ppmv level in synthetic air have been reacted with NO3 and the reaction followed using