| Study on the Deactivation Kinetics of Pd（PPh3）2Cl2 in the Monocarbonylation of Benzyl Chloride |
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| 作者姓名： | Zumin Qiu Yunbing He Huiping Xiao
School of Environmental Science and Engineering Nanchang University Nanchang China |
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| 作者单位： | Zumin Qiu，Yunbing He，Huiping Xiao
School of Environmental Science and Engineering，Nanchang University，Nanchang 330029，China |
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| 基金项目： | 教育部科学技术基金，江西省自然科学基金，南昌大学校科研和教改项目 |
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| 摘 要： | The deactivation kinetics of Pd(PPh3)2Cl2 in the monocarbonylation of benzyl chloride to synthesize phenylacetic acid is studied in this paper. Solid 1-(2-pyridylazo)-2-naphthol (PAN) is used as the colouring agent, and the concentration of Pd(PPh3)2Cl2 in the system is measured through absorptiometry. The result shows that the optimum condition of the chromogenic reaction between Pd2+ and PAN is: 0.5 ml of 0.04% PAN added to 10 ml of Pd2+ solution (1.0×10-6-2.0×10-5 mol/L), and heated in a constant temperature water bath at 40℃ for about 30 min, with pH of the solution being about 3.0. The molar coefficient of absorption is 1.384×104 L/(mol·cm); the orders of the hydrolytic reaction to the concentration of Pd(PPh3)2Cl2, PPh3, phenylacetic acid and NaOH are 0.5, minus 0.8, 2 and 1.2, respectively. The activation energy (E) of the hydrolytic reaction is 75.59 kJ/mol, and the pre-exponential factor is 1.68×1012.
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| 关 键 词： | 钝化作用 反应动力学 苄基氯化物 吸光测定法 羟基化作用 二氯二（三苯基磷）铅 |
Study on the Deactivation Kinetics of Pd(PPh3)2Cl2 in the Monocarbonylation of Benzyl Chloride |
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| Zumin Qiu,Yunbing He,Huiping Xiao
School of Environmental Science and Engineering,Nanchang University,Nanchang ,China.Study on the Deactivation Kinetics of Pd(PPh3)2Cl2 in the Monocarbonylation of Benzyl Chloride[J].Journal of Natural Gas Chemistry,2004,13(3):177-183. |
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| Authors: | Zumin Qiu Yunbing He Huiping Xiao |
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| Institution: | School of Environmental Science and Engineering, Nanchang University, Nanchang 330029, China |
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| Abstract: | The deactivation kinetics of Pd(PPh3)2Cl2 in the monocarbonylation of benzyl chloride to synthesize phenylacetic acid is studied in this paper. Solid 1-(2-pyridylazo)-2-naphthol (PAN) is used as the colouring agent, and the concentration of Pd(PPh3)2Cl2 in the system is measured through absorptiometry.The result shows that the optimum condition of the chromogenic reaction between Pd2 and PAN is:0.5 ml of 0.04% PAN added to 10 ml of Pd2 solution (1.0×10-6-2.0×10-5 mol/L), and heated in a constant temperature water bath at 40 ℃ for about 30 min, with pH of the solution being about 3.0.The molar coefficient of absorption is 1.384×104 L/(mol.cm); the orders of the hydrolytic reaction to the concentration of Pd(PPh3)2Cl2, PPh3, phenylacetic acid and NaOH are 0.5, minus 0.8, 2 and 1.2,respectively. The activation energy (E) of the hydrolytic reaction is 75.59 k J/mol, and the pre-exponential factor is 1.68×1012. |
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| Keywords: | dichloro-bistriphenylphosphine palladium deactivation kinetics hydrolysis absorptiometry |
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