Kinetic Evidence for High Reactivity of 3-Nitrophenylboronic Acid Compared to Its Conjugate Boronate Ion in Reactions with Ethylene and Propylene Glycols

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• 作者：Chiaki Miyamoto ; Kazunori Suzuki ; Satoshi Iwatsuki ; Masahiko Inamo ; Hideo D. Takagi ; Koji Ishihara
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：March 3, 2008
• 年：2008
• 卷：47
• 期：5
• 页码：1417 - 1419
• 全文大小：85K
• 年卷期：v.47,no.5(March 3, 2008)
• ISSN：1520-510X

文摘

The rate constants for a boronate ion were determined for the first time using the reaction systems of 3-nitrophenylboronic acid (3-NO₂PhB(OH)₂) with ethylene glycol (EG) and propylene glycol (PG) in an alkaline solution: the rate constants (25 °C, I = 0.10 M) for the reactions of 3-NO₂PhB(OH)₃⁻ are 1.2 M⁻¹ s⁻¹ (EG) and 1.5 M⁻¹ s⁻¹ (PG), which are at least 10³ times smaller than those for the reactions of 3-NO₂PhB(OH)₂ [1.0 × 10⁴ M⁻¹ s⁻¹ (EG) and 5.8 × 10³ M⁻¹ s⁻¹ (PG)].