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(Ph5Cp)Cu(PPh3) (1) has been synthesized from Na[Ph5Cp] and [(PPh3)CuCl]4. Complex 1 is the first reported pentaphenylcyclopentadienyl−copper complex and is a rare example of a π-bound Cu−Cp complex. Complex 1 has been fully characterized, including crystallographically; the 31P NMR chemical shift for the triphenylphosphine ligand in 1 appears unusually far downfield for a Cu(I)−PPh3 complex, at +23.2 ppm.
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Anderson et al. (1998) studied this question.
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