Abstract
Under identical experimental conditions the kinetics of oxidation of aromatic anils to benzaldehyde and nitrosobenzene, by isonicotinium dichromate, has been studied in aqueous acetic acid medium. The low dielectric constant of the medium facilitates the reactivity. Ionic strength has no significant effect on the conversion. The added Mn(II) decreases the rate of the reaction. The added acrylonitrile has no effect on the reaction rate indicating the absence of free radical mechanism. Highly negative ΔS # values indicate a structured transition state. The deviation of Hammett plot is noted and a concave downward curve is obtained for the anils with substituents in the aniline moiety. The observed break in the log k obs versus σ is attributed to the change in the transition state whereas the linear plot is observed for the substituents in the benzaldehyde moiety. A suitable mechanism has been proposed.
Graphical Abstract
Mechanistic investigation of oxidation of aromatic anils by isonicotinium dichromate in acidic medium. A kinetic study. \({\hbox{Ph-CH=N-Ph}\dynrightarrow{\hbox{Cr(VI)}} {\hbox{H}^{+}}\hbox{PhCHO}+\hbox{Ph}-\hbox{N}= \hbox{O}+\hbox{Cr}(\hbox{III})}\)
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References
Cainelli G. and Cardillo G. (1984). Chromium Oxidations in Organic Chemistry. Springer Verlag, Berlin
Aparna P., Kothari S. and Banerji K.K. (1995). Proc. Ind. Acad. Sci. 107: 213
D. Doyamoy and M.K. Mahendra, J. Org. Chem., 55, 5848 (1990).
Gurumurthy R. and Karunakaran K. (1995). J. Indian Chem. Soc. 72: 349
Mangalam G. and Meenakshisundaram SP. (1991). J. Indian Chem. Soc. 68: 77
R. Asopa, A. Mathur and K.K. Banerji, J. Chem. Res. Symp., 152 (1992).
Catto A., Corbani F., Rindone B. and Scolastico C. (1973). Tetrahedron Lett. 29: 2723
Rindone B. and Scolastico C. (1975). J. Chem. Soc., Perkin Trans. I 20: 2022
Narasimha Bharathi S., Sundaram E.V. and Venkatasubramanian N.V. (1977). Indian J. Chem. 15B: 376
Narasimha Char P., Sethuram S. and Navaneeth Rao T. (1988). Indian J. Chem. 27A: 31
Ramesh S., Umesh N. and Dodwad S.S. (1997). Asian J. Chem. 9(2): 195
Karthikeyan G., Elango K.P., Karunakaran K. and Balasubramanian A. (1998). Oxid. Commun. 21(1): 51
Umesh N., Ramesh S. and Dodwad S.S. (1997). Asian J. Chem. 9(1): 58
Karunakaran K., Nagarajan S., Kanagavel D., Jegadish T.N., Palanisamy P.N. and Elango K.P. (1997). Oxid. Commun. 20(4): 576
Lopez C., Gonzalez A., Cossio F.D. and Palomo C. (1985). Synth. Commun. 15: 1197
Campbell K.N., Sommers A.H. and Campbell B.K. (1944). J. Am. Chem. Soc. 66: 82
Bradley G.M. and Strauss H.L. (1975). J. Phys. Chem. 79: 1953
Lee D.G. and Stewart R. (1964). J. Am. Chem. Soc. 86: 3051
Ramalingam G., Jayanthi S. and Gopalakrishnan M. (2006). Oxid. Commun. 29(3): 684
Hammett L.P. (1937). J. Am. Chem. Soc. 59: 96
Mahadevappa D.S. (1990). Pattusamy, Indian J. Chem. 29A: 42
Rajasekaran K., Baskaran T. and Gnanasekaran C. (1987). Indian J. Chem. 26A: 956
Abdul-Jameel A. (1998). J. Indian Chem. Soc. 75: 439
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Ramalingam, G., Jayanthi, S.K. Mechanistic investigation of oxidation of aromatic anils by isonicotinium dichromate in acidic medium. A kinetic study. Transition Met Chem 32, 475–480 (2007). https://doi.org/10.1007/s11243-007-0190-x
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DOI: https://doi.org/10.1007/s11243-007-0190-x