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A series of cis-diphenylated cyclopropanes has been introduced into the C-H acidic position of a range of nucleophiles, for example, deprotonated esters and acid amides, ketones, and sulfones. In these reactions bis[(η3-l,3-diphenylallyl)palladium] complexes serve as electrophiles, and products such as 1 form. Quaternary carbon centers exocyclic to the newly formed three-membered ring are installed with ease.
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Otte et al. (1994) studied this question.
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