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Copper complexes of 3-trifluoroacetyl-(+)-camphor and two of its drivatives give high optical yields when used ascatalysts for the asymmetric cyclopropanation of styrene with 2-diazodimedone; an immobilised analogue of these homogeneous catalysts retains high activity, is readily recovered, and has portential for recycling.
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Matlin et al. (1984) studied this question.
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