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

doi:10.1016/j.inoche.2005.05.011

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^*

^*この研究の対応する著者

先進理工学部

研究成果: Article › 査読

14 被引用数 (Scopus)

抄録

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.

本文言語	English
ページ（範囲）	713-716
ページ数	4
ジャーナル	Inorganic Chemistry Communication
巻	8
号	8
DOI	https://doi.org/10.1016/j.inoche.2005.05.011
出版ステータス	Published - 2005 8月

ASJC Scopus subject areas

物理化学および理論化学
無機化学
材料化学

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10.1016/j.inoche.2005.05.011

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引用スタイル

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

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.",

keywords = "4-Isopropyltropolonate, Interconversion, Kinetics, m-Nitrophenylboronic acid",

author = "Takeshi Matsumura and Satoshi Iwatsuki and Koji Ishihara",

note = "Funding Information: Financial Support from the 21COE program “Practical Nano-Chemistry” from MEXT, Japan, and Waseda University Grant for Special Research Projects are gratefully acknowledged. ",

year = "2005",

month = aug,

doi = "10.1016/j.inoche.2005.05.011",

language = "English",

volume = "8",

pages = "713--716",

journal = "Inorganic Chemistry Communications",

issn = "1387-7003",

publisher = "Elsevier BV",

number = "8",

}

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T1 - Direct kinetic measurements for the fast interconversion process between trigonal boronic acid and tetragonal boronate ion at low temperatures

AU - Matsumura, Takeshi

AU - Iwatsuki, Satoshi

AU - Ishihara, Koji

N1 - Funding Information: Financial Support from the 21COE program “Practical Nano-Chemistry” from MEXT, Japan, and Waseda University Grant for Special Research Projects are gratefully acknowledged.

PY - 2005/8

Y1 - 2005/8

N2 - 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.

AB - 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.

KW - 4-Isopropyltropolonate

KW - Interconversion

KW - Kinetics

KW - m-Nitrophenylboronic acid

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SN - 1387-7003

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EP - 716

JO - Inorganic Chemistry Communications

JF - Inorganic Chemistry Communications

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