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Diarylmercury(II) compounds, HgR2 (particularly bis(pentafluorophenyl)mercury), which are easily prepared and are stable to air and moisture, are attractive reagents for the synthesis of highly reactive lanthanoid organometallics and complexes. Thus, reactions of HgR2 (R=C6F5) with elemental lanthanoids in donor solvents generate organolanthanoid species that when subsequently treated with a protic...