Oxygen Atom Transfer Reactions of Metal Carbonyl Compounds——Kinetics of CO Substitution Reactions of Cr(CO)6 in the Presence of Substituted Iodosylbenzenes

Abstract

Abstract: The kinetic data are reported for the reactions between Cr(CO)₆ and the entering lin-gands L(where L=CH₃CN,PPh₃) in the presence of substituted iodosylbenzenes R-C₆H₄IO to form Cr(CO)₅L.The results indicate that the steric hindrance of substituents of R-C₆H₄IO increases the rate of the reactions,the reactivities decreases in the order;o-substituted>m-substi-tuted>p-substituted>unsubstituted.There is a good linear correlation between the rate of O-a-torn transfer reactions and the electronic factors of p-substituted iodosylbenzenes,and the electron-withdrawing substituents make the reaction faster,the reactivities of R-C₆H₄IO increase with weakening the I-Obond strengths at the similar steric hindrance.

Key words: Substituted iodosylbenzenes, Hexacarbonyl chromium, Oxygen atom transfer, Kinetics

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JIAO Xiang-Dong, FAN Wen-Ge, GAO Yi-Ci, SHI Qi-Zhen. Oxygen Atom Transfer Reactions of Metal Carbonyl Compounds——Kinetics of CO Substitution Reactions of Cr(CO)₆ in the Presence of Substituted Iodosylbenzenes[J]. Chem. J. Chinese Universities, 1992, 13(10): 1291.

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Oxygen Atom Transfer Reactions of Metal Carbonyl Compounds——Kinetics of CO Substitution Reactions of Cr(CO)₆ in the Presence of Substituted Iodosylbenzenes

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