Effects of peripheral substituents on epimerization kinetics of formylated chlorophylls

DOI Web Site 参考文献42件
  • Masayuki Tanaka
    Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
  • Aiko Tanaka
    Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
  • Yoshitaka Saga
    Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan

この論文をさがす

説明

<jats:p> C13<jats:sup>2</jats:sup>-[Formula: see text]-epimers of chlorophyll (Chl) molecules are important cofactors in the photosystem I reaction centers in oxygenic photosynthetic organisms; however, their production mechanism is still unclear. The reaction properties of Chl epimerization are helpful for a better understanding of the molecular mechanism of the in vivo formation of Chl C13<jats:sup>2</jats:sup>-[Formula: see text]-epimers. We report herein the kinetic properties of the epimerization of formylated Chl molecules, Chl [Formula: see text] and Chl [Formula: see text], by use of triethylamine. Both Chl [Formula: see text] and Chl [Formula: see text] performed faster epimerization kinetics than Chl [Formula: see text], indicating that the electron-withdrawing ability of the formyl groups directly linked to the chlorin macrocycle is responsible for acceleration of the epimerization. Comparing the rate constants of the two mono-formylated Chl molecules indicated that the epimerization of Chl [Formula: see text] was faster than that of Chl [Formula: see text]. This difference is rationalized by invoking a combination of the inductive effects of the C3- and C7-substituents in Chls; the sums of Hammett [Formula: see text] parameters of the C3- and C7-substituents exhibited high correlations with the epimerization rate constants of Chls [Formula: see text], [Formula: see text], and [Formula: see text]. </jats:p>

収録刊行物

参考文献 (42)*注記

もっと見る

関連プロジェクト

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ