Investigation of kinetic and mechanism of triphenylphosphine addition to para-naphthoquinone

✍ Scribed by Davood Nori-Shargh; Abolfazl Soofi; Nasrin Saroogh Farahani; Farzad Deyhimi

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 174 KB
• Volume: 37
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.20099

✦ Synopsis

Abstract

This work reports the results of a kinetic and mechanistic investigations of the addition reaction of triphenylphosphine to para‐naphtoquinone in 1,2‐dichloromethane as solvent. The order of reaction with respect to the reactants was determined using initial rate method, and the rate constant was obtained on the basis of pseudo‐first‐order method. Variable time method using Uv–Vis spectrophotometry (at 400 nm) was utilized for monitoring this addition reaction, for which the following Arrhenius equation was obtained:

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The resulting activation parameters E~a~, Δ__H__^#^, Δ__G__^#^, and Δ__S__^#^ at 300 K were 13.63, 14.42, 18.75 kcal mol^−1^, and −14.54 cal mol^−1^K^−1^, respectively. The results suggest that the reaction is first order with respect to both triphenylphosphine and para‐naphthoquinone. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: 427–433, 2005