Английская Википедия:Biferrocene
Шаблон:Short description Шаблон:Chembox Biferrocene is the organometallic compound with the formula [(C5H5)Fe(C5H4)]2. It is the product of the formal dehydrocoupling of ferrocene, analogous the relationship between biphenyl and benzene. It is an orange, air-stable solid that is soluble in nonpolar organic solvents.
Biferrocene can be prepared by the Ullmann coupling of iodoferrocene.[1] Its one-electron oxidized derivative [(C5H5)Fe(C5H4)]2+ attracted attention as a prototypical mixed-valence compound.[2]
A related compound is biferrocenylene, [Fe(C5H4)2]2 wherein all cyclopentadienyl rings are coupled. Formally, biferrocene is derived from one fulvalene ligand, and biferrocenylene is derived from two.
Reactions
Biferrocene can easily be converted into a mixed-valence complex, which is called biferrocenium. This [Fe(II)-Fe(III)] cation is a class II type (0.707 > α > 0) mixed-valence complex according to the Robin-Day classification.[2]
Derivatives
Aminophosphine ligands with biferroceno substituents have been prepared as catalysts for asymmetric allylic substitution[3] and asymmetric hydrogenation of alkenes.[4]
Related compounds
References
Шаблон:Cyclopentadienide complexes
Шаблон:Inorganic-compound-stub
