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Correlation of substituent resonance effects with free radical spin densities

✍ Scribed by I.B. Afanas'ev

Book ID
104248958
Publisher
Elsevier Science
Year
1970
Tongue
French
Weight
236 KB
Volume
11
Category
Article
ISSN
0040-4039

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✦ Synopsis

The rate constants of radical reactions are know to depend at least on three principal effects: polar, resonance and steric. A steric effect can be ignored for compounds which do not have bulky substituents.

Then substituent effects can be expressed in terms of the Taft equation (I):

h5(ksub/ko) =P *d'+ r'd'

/I/ ( k sub and k. are rate constants of substituted and unsubstituted compounds l

πŸ“œ SIMILAR VOLUMES

Effect of substituents on spin density i
Effect of substituents on spin density in benzimidazole nitronyl nitroxide radicals studied by electron spin resonance
✍ Burak Esat; Ismail Fidan; Sumeyye Bahceci; Yusuf Yerli; Levent Sari πŸ“‚ Article πŸ“… 2009 πŸ› John Wiley and Sons 🌐 English βš– 259 KB

## Abstract Several novel benzimidazole‐3‐oxide‐1‐oxyl radicals with substituents at 5 and/or 6 position were synthesized. The ESR analysis of nitrogen hyperfine coupling constants (hfccs) revealed that substituents at 5 and 6‐position affect the spin density to greater extent than substituents on