Up to 40% ee was obtained in the asymmetric epoxidation of styrene and other unfunctionalised olefins catalysed by the ruthenium(II) complex [RuCl(PNNP)]PF6 (PNNP = N,N′-{(o-diphenylphosphino)benzylidene}-(1S,2S)-diiminocyclohexane)using hydrogen peroxide as the primary oxidant.
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Stoop et al. (1999) studied this question.
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