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A couple of couplings: Air-stable diamino- and dioxophosphine oxides are used as preligands in the nickel-catalyzed Kumada cross-coupling reactions of aryl Grignard reagents. A sterically hindered preligand allows for highly efficient cross-coupling of aryl fluorides at ambient temperature (acac=acetylacetonate).
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Ackermann et al. (2005) studied this question.
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