Mechanism of the chromium-catalyzed epoxidation of olefins. Role of oxochromium (V) cations

EG Samsel, K Srinivasan, JK Kochi

Index: Samsel, E. G.; Srinivasan, K.; Kochi, J. K. Journal of the American Chemical Society, 1985 , vol. 107, # 25 p. 7606 - 7617

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Citation Number: 423

Abstract

Abstract: The catalytic epoxidation of various olefins with iodosylbenzene is efficiently carried out by a series of chromium (II1) cations Cr"'(salen)+(I) which are promoted by pyridine N-oxide (py0) and related oxygen donors as the cocatalyst. Analysis of the catalytic rate profile and products establish the oxochromium (V) derivative O= Cr (salen)+(11) and its donor adduct O= Cr (salen)(pyO)+(111) as the reactive intermediates in the catalytic cycle. ...