Abstract
Abstract The kinetics of the epoxidation of cis-cyclooctene, 2-norbornene and limonene catalyzed by cis-[RuCl2(dppb)(2,2′-bipy)] (1) or trans-[RuCl2(dppb)(2,2′-bipy)] (2) (where, dppb: 1,4-bis(diphenylphosphino)butane; 2,2′-bipy: 2,2′-bipyridine) in the presence of iodosylbenzene (PhIO) follow a Michaelis–Menten type mechanism. The performance of 1 and 2 in the epoxidation of cis-cyclooctene, 2-norbornene and limonene are respectively (1) Vmax=8.62, 11.6 and 4.98 mol l−1 min−1 and (2) Vmax=4.28, 7.55 and 5.66 mol l−1 min−1. The activation energies of the epoxidations catalyzed by 1 are 1.5–3.3 kcal mol−1 lower than those measured for 2.
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