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These strained moieties readily undergo cycloadditions with aldehydes, ketones, thioketones, nitriles, naphth\u20102\u2010ols and various other substrates to yield the corresponding carbo\u2010 and heterocycles. Diastereocontrol can be achieved through the choice of catalyst (Br\u00f8nsted or Lewis acid). The formation of tetrahydrofurans was shown to be highly enantiospecific when chiral cyclopropanes are employed. 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