Novel Straightforward Access to a 2,2′-Bipyridine Ligand Bearing Two “(η2-dppe)(η5-C5Me5)FeC≡C−” Redox-Active Substituents by Homocoupling of Mononuclear Organoiron(II) 2-Bromopyridyl Synthons
摘要:
We report in this contribution the synthesis and characterization of the two organoiron(H) (eta(2)-dppe)(eta(5)-C5Me5)FeC C-(5,2-C5H3N-X) compounds (X = Cl, 6a; X = Br, 6b) bearing a pendant halogenated m-pyridyl group. These new functional "metallo-ligands" allow for an original, convenient, and rapid synthetic access to the 2,2'-bipyridine (bipy) ligand (3) bearing two redox-active "(eta(2)-dppe)(eta(5)-C5Me5)FeC C-" organometallic moieties grafted to the 5,5'-positions of bipy via a Pd-catalyzed homocoupling procedure.
New pyridyl-functionalized organoiron alkynyl complexes. Easy access to polymetallic architectures featuring an electroactive site by simple co-ordination reactions
作者:Sylvie Le Stang、Dirk Lenz、Frédéric Paul、Claude Lapinte
DOI:10.1016/s0022-328x(98)00961-9
日期:1999.1
The functionalizedcomplexes 3a–d [(dppe)Cp*Fe(CCL)] (L=4-Py, 3-Py, 2-Py) were isolated with good yields from the alkynyl complex 1 [(dppe)Cp*Fe(CCH)] (dppe=1,2-bis(diphenylphosphino)ethane) from the corresponding bromopyridines using a Sonogashira-coupling reaction. These redox active compounds are stable under two redox states and react as usual pyridyl ligands towards methyl iodide or (THF)W(CO)5