Direct kinetic measurements for the fast interconversion process between trigonal boronic acid and tetragonal boronate ion at low temperatures

Takeshi Matsumura, Satoshi Iwatsuki, Koji Ishihara

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The rate constant, k1, for the following addition reaction between 4-isopropyltropolonate (ipt-) and meta-nitrophenylboronic acid (m-NO2PhB(OH)2) in acetonitrile was measured at various temperatures by using a low-temperature stopped-flow spectrophotometer:m-NO2PhB(OH)2+ipt -⇌k-1k1m-NO2PhB(OH) 2(ipt)-;k1 = 7.9 × 104M -1 s-1 at 25°C, ΔH1*=34. 7±1.0kJmol-1,ΔS1*=-34.8±3. 8Jmol-1K-1, which indicates that the interconversion between the trigonal boronic acid and the tetrahedral boronate ion is much faster than the chelate formations for the complexation of boronic acid with bidentate ligands, but much slower than the diffusion-controlled reactions.

Original languageEnglish
Pages (from-to)713-716
Number of pages4
JournalInorganic Chemistry Communication
Volume8
Issue number8
DOIs
Publication statusPublished - 2005 Aug 1

Keywords

  • 4-Isopropyltropolonate
  • Interconversion
  • Kinetics
  • m-Nitrophenylboronic acid

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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