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    Author(s): Yasunori Yoshida; Bunchiro Tomita; Chung-Yun Hse
    Date: 1995
    Source: Mokuzai Gakkaishi 41(7):652-658
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (895 KB)

    Description

    Concurrent reactions involving cocondensation and self-codensation were determined simultaneously in the reactions of o- and p-methylolphenol, respectively, with urea. The results were as follows: (1) The reactivity ratio of self-condensation to cocondensation could be determined by Equation [4] for the concurrent reaction of monomethylolphenol with urea. (2) For the reaction of o-methylolphenol with urea in water, it was found that the second-order rate constant of the self-condensation due to the formation of a o,p-methylene linkage is approximately ten times greater than that of the cocondensation between o-methylolphenols with urea. The reaction solvent of the mixture of water and dioxane reduced the reactivity ratio. (3) For the reaction of p-methylolphenol with urea under water/dioxane solvent, it was suggested that the rate constant of the cocondensation is approximately four times greater than that of the self-condensation between p-methylolphenols.

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    Citation

    Yoshida, Yasunori; Tomita, Bunchiro; Hse, Chung-Yun. 1995. Kinetics on cocondensation between phenol and urea through formaldehyde III. Mokuzai Gakkaishi 41(7):652-658

    Keywords

    Cocondensation, urea/methylolphenols, kinetics, reactivity ratio, C-13 NMR

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