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[reaction: see text]. The intramolecular, stereoselective addition of 1-vinylcyclopropanols to tethered aldehydes has been achieved under mild conditions. Thus, sequential application of the titanium-mediated cyclopropanation of alpha,beta-unsaturated esters and the electrophilic cyclization of the aldehyde-tethered cyclopropanol products provides the facile formation of carbocyclic rings.
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Youn et al. (2001) studied this question.
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