Steric hindrance of the ancillary phosphane ligand triggers reductive elimination from aryl palladium complexes of typically unreactive ligands derived from 1,3-dicarbonyl anions [Eq. (1); FcPtBu2=di-tert-butylphosphanylferrocene]. This reaction is the product-forming step of the recently developed palladium-catalyzed malonate arylations.
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Wolkowski et al. (2002) studied this question.