A bis-dipyrromethane ligand, 4,4'-bis(1,1-bis(3,5-dimethyl-1H-pyrrol-2-yl)ethyl)-1,1'-biphenyl, [H-BDPM-BPh] (), is synthesized via acid-catalyzed electrophilic aromatic substitution of 2,4-dimethylpyrrole with 4,4'-diacetylbiphenyl. Subsequent deprotonation of with -BuLi yields the corresponding Li-salt [Li-BDPM-BPh] (). Transmetalation involving and either CoCl or [Co(HMDS)] (HMDS = -N(Si(CH))) results in dinuclear Co(II) complexes.
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