Scheme 7.
Selected compounds with the pincer ligand 2b as two and four electron donor. (a) CeBr3 in THF, (b) UCl4, (c) 2 eq. of Mo(CO)3(NCMe)3, (d) 2 eq. of Ni(CO)4, (e) 2 eq. of CuX, (f) 2 eq. of [Cu]PF6/1 eq. of P-P.
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