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A simple reduction of the PdII complex 1 affords the PdI dimer 2, featuring a μ2 symmetrically bridging phosphole unit, and thus a novel coordination mode for a tertiary phosphane. Complex 2 appears to be very stable towards additional ligands such as CO and PPh3, and the structural data are in accordance with calculations, which reveal that the Pd−Pd and Pd−P bonding is highly delocalized.
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Sauthier et al. (2001) studied this question.
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