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A new catalytic route to cyclopropanes from alkenes and diazolakanes is provided by pentacarbonyl(η2-cis-cyclooctene)chromium(0), which generates the catalyst “Cr(CO)5”. The reactions (1) are characterized by a pronounced chemoselectivity of the participating carbene complex intermediates 1 and allow the unambiguous discrimination of diversely substituted olefins.
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Pfeiffer et al. (1997) studied this question.
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