Ferrocenyl complexes, bimetallic

Ferrocene-containing metal complexes have been reported over the years, and the topic has been reviewed (263). Again, the preferred method to prepare such complexes is the utilization of ferrocenyllithium with metal halides. Examples of bimetallic ferrocenyl compounds are known where the a--bonded metals are in both high and low formal oxidation states. 

Selected Data for Bimetallic Complexes Containing Ferrocenyl Fragments... 

A bimetallic Rh-Re catalyst (9) is effective for related hydrogenations shown in equation (16) that works best if R = R = H (ee 82-98%). The X-ray structure of the racemic complex was determined. Chiral derivatives of the more familiar ferrocenyl phosphines are effective in the rhodium-catalyzed hydrogenation of... 

The preparation of ferrocenyl substituted pyridines, such as 4-ferrocenylpyiidine and l,r-di(2-pyiidyl)feiTocene (L), allowed the preparation of complexes with formula [Rh(cod)L2]CI04. The multitopic ligands, A,A -bis[(A)-prolyl)phenylenediamine, A,A -bis [(A)-pyrrolidin-2-yl]methyl)phenylenediamine, A,Af -bis[(6 )-A-benzylprolyl]phe-nylenediamine, and A,A -bis [(A)-Af-benzyl-pyrrolidin-2-yl]methyl)phenylenediamine, were synthesized and their coordination properties with Rh(i) studied. The ligand bis(bipyridine)-calix[4]arene (BBPC) reacted with 2 equiv. of [Rh(nbd)2]BF4 or [Rh(nbd)(CH3CN)2]BF4 yielding the bimetallic compound [Rh(nbd)(BBPC)]2[BF4]2 396. ... 

The bis(silylene) chelate ligand with ferrocenyl spacer coordinates to CpCo (Cp = Ti -cyclopentadienyl) fragment generating a bimetallic bis(silylene) complex. The ferrocenyl bis(silylene) LSi-Fc-SiL chelate ligand is generated upon treatment of chlorosi-lylene LSiCl (L = PhC NtBu)2) (10) with l,l -dilithioferrocene in hexane (Scheme 8.5.1) (11). 

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