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Decomposition of vinyldiazoacetates by rhodium(II) ( N -dodecylbenzenesulfonyl)prolinate (Rh 2 ( S -DOSP) 4, 1 ) in the presence of dienes results in a direct and highly enantioselective method for the formation of cis -divinylcyclopropanes. Combination of this process with a subsequent Cope rearrangement results in a highly enantioselective synthesis of a variety of cycloheptadienes containing multiple stereogenic centers.
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Davies et al. (1998) studied this question.
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