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Under homogeneous conditions, the silver(I)-catalysed cyclisation of the allenic amine derivatices (3a–c), thogh not (3d), is stereoselective giving cis-2,5-disubstituted pyrrolidines in high yield; cyclisation on (3a), using a heterogeneous silver(I)-catalyst, is nonstereoselective.
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Kinsman et al. (1987) studied this question.
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