KINETICS ON COCONDENSATION BETWEEN PHENOL AND UREA THROUGH FORMALDEHYDE .3. CONCURRENT REACTIONS OF MONOMETHYLOLPHENOL AND UREA INVOLVING COCONDENSATION AND SELF-CODENSATION

Concurrent reactions involving cocondensation and self-codensation wer e determined simultaneously in the reactions of o- and p-methylolpheno l, respectively, with urea. The results were as follow : (1) The react ivity ratio of self-condensation to cocondensation could be determined by Equation [4] for the concurrent reaction of monomethylolphenol wit h urea. (2) For the reaction of o-methylolphenol with urea in water, i t was found that the second-order rate constant of the self-condensati on due to the formation of a o,p-methylene linkage is approximately te n times greater than that of the cocondensation between o-methylolphen ols with urea. The reaction solvent of the mixture of water and dioxan e reduced the reactivity ratio. (3) For the reaction of p-methylolphen ol with urea using a water/dioxane solvent, it was suggested that the rate constant of the cocondensation is approximately four times greate r than that of the self-condensation between p-methylolphenols.