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A new stereocenter is formed by ring-rearrangement metathesis (RRM), which has now been extended to diastereoselective processes. Selectivities are catalyst- and substrate-dependent. In these conversions yielding carbo- and heterocycles, d.r. values of up to 14:1 were obtained. For example, cyclooctadiene 1 was converted into piperideine 2 at room temperature and with high diastereoselectivity (Ts=toluene-4-sulfonyl).
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Böhrsch et al. (2006) studied this question.
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