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|Title:||Kinetics and mechanism of phenolformaldehyde and TEMP-formaldehyde base catalysed reactions|
|Authors:||Jassal, P S|
Rakshit, A K
|Abstract:||Reaction of formaldehyde with both phenol and 2-tertiary butyl 4-methyl phenol (TBMP) catalysed by tetraethyl ammonium hydroxide, triethylamine, diethylamine and ethylamine follows an overall second order rate kinetics. Overall rate constant k in phenol- HCHO reaction is resolved into stepwise rate constant k1 for the formation of monomethylol phenol, k2 for dimethylol phenol and k3 for trimethylol phenol and their respective concentrations have also been calculated. The reaction is slower with TBMP and also in the presence of catalyst ethylamine. Change in the medium also influences the rate and it is higher in 1,4-dioxan-water and lower in methanol-water solvents indicating that the reactions are more non-ionic in character. Activation energy (Ea) and entropy of activation (ΔS≠) have been calculated and the mechanism of the reactions is proposed based on these results.|
|Appears in Collections:||IJC-A Vol.39A(06) [June 2000]|
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