| Autor: |
Lobachev, V., Zimtseva, G., Rudakov, E. |
| Zdroj: |
Theoretical & Experimental Chemistry; Jan2001, Vol. 37 Issue 1, p17-22, 6p |
| Abstrakt: |
The kinetics of the hydroxymethylation of benzene and methylbenzenes in a formaldehyde–sulfuric acid (52.5 wt.%) system in the temperature range 14-90 °C has been studied. With [ArH] ≪ [CH2O] the reaction is first order in substrate and less than first order in formaldehyde. The substrate selectivity, entropy and enthalpy of activation in the series of arenes studied correlate with the basicity of ArH. A reaction mechanism is proposed which includes the rapid equilibrium formation of a charge transfer complex between ArH and CH2OH+ and a slow stage in which it is converted to a σ-complex. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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