ホルムアルデヒド樹脂に関する研究　ＸＸＩＩＩ　　メラミンのホルムアルデヒドによるヒドロキシメチル化反応における一般塩基触媒反応機構　　律速段階の変化の証拠

DOI

書誌事項

タイトル別名
  • Studies on formaldehyde resin. XXIII. Mechanism of general base catalysis of hydroxymethylation of melamine with formaldehyde. Evidence for the change of rate-determining step.

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説明

General base-catalyzed mechanism has been proposed for the hydroxymethylation of melamine (MH) with formaldehyde (F) in the presence of tertiary amines (triethylenediamine, 3-chloroquinuclidine) -their conjugate acids buffers, since the rate equation contains a second order term with respect to base catalyst as well as the first order term (kB-reaction). According to this mechanism, the complex composed of MH, F and base catalyst (B) is formed (MH+F+B k1→←k-1complexk2→product) as an intermediate, and the ratedetermining step is the k1 step for strong base catalyst, hydroxide ion, whereas the rate-determining step is the k2 step for weaker base catalyst, amine. The above intermediate would be the complex T± ·B, involving the zwitterion T± formed by the reaction of amino group of MH with carbonyl group of F, or the complex T-·HB+ formed by proton transfer.

収録刊行物

  • 高分子論文集

    高分子論文集 43 (2), 77-81, 1986

    公益社団法人 高分子学会

キーワード

詳細情報 詳細情報について

  • CRID
    1390001206523303424
  • NII論文ID
    130003836994
  • DOI
    10.1295/koron.43.77
  • ISSN
    18815685
    03862186
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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