Abstract
AbstractQuasi‐tetrahedral o‐azophenylboronic acid (azoB‐ROH), which contains the protic solvent ROH, is a key species in the colorimetric sensing of saccharides by o‐azophenylboronic acid (azoB). In this study, we compared the reactivity of azoB‐ROH with that of trigonal azoB and tetrahedral o‐azophenylboronate (azoB‐OH−), and clarified the reaction mechanism of azoB‐ROH with cis‐1,2‐cyclopentanediol and D‐glucose. Analysis of the kinetics of the reactions of azoB with cis‐1,2‐cyclopentanediol and D‐glucose in DMSO:water = 1:9 and azoB with cis‐1,2‐cyclopentanediol in tetrahydrofuran containing a small amount of methanol revealed that there was not much difference in the reactivity of azoB‐H2O and azoB‐OH−, although the reactivity of azoB was higher than that of azoB‐MeOH, that is, the reaction mechanism of azoB‐H2O was essentially the same as that of azoB‐OH−.
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