A C2-symmetric analogue of dppf: synthesis and structures of the indenyl-diphosphine complex 1,3-(Ph2PSe)2(C9H6) and the racemic and meso isomers of the heterobimetallic complex Mo(CO)4(1-PPh2-η5-C9H6)2Fe

Facile meso to rac Isomerization of the Bis-Planar Chiral Ferrocenyldiphosphine Bis(1-(diphenylphosphino)-η5-indenyl)iron(II)

“…Compounds containing two planar chiral units may exhibit rac and meso isomers. We recently reported the preparation of the diindenyl analogue of 1,1‘-bis(diphenylphosphino)ferrocene (dppf), bis(1-(diphenylphosphino)-η 5 -indenyl)iron(II) ( 1 ), and the characterization of its rac and meso isomers by X-ray crystallographic studies of their tetracarbonylmolybdenum complexes . Unfortunately, we had been unable to isolate the two isomers.…”

Electrochemistry and UV/visible spectroscopy of phosphino-substituted bis(η5-indenyl)iron(II) complexes

“…The synthesis and characterization of the ferrocenes illustrated in Scheme 1 have all been reported previously by us [22,23]. They can all be prepared by treatment of the indenide (formed by deprotonation of the indene with BuLi) with anhydrous ferrous chloride in THF.…”

Mechanistic Studies on a Facile Ring-Flipping Process in Planar Chiral Ferrocenes under Ambient and High Pressure and Its Relevance to Asymmetric Catalysis

“…We have previously reported the preparation of the diindenyl analogue of 1,1‘-bis(diphenylphosphino)ferrocene (dppf), bis(1-diphenylphosphino-η 5 -indenyl)iron(II) ( 1 ), and the characterization of its rac and meso isomers by X-ray crystallographic studies of their tetracarbonylmolybdenum complexes . We now report on the remarkable ring-flipping meso to rac isomerization process of 1 and detailed mechanistic studies that we have carried out to elucidate the mechanism of this process.…”

“…12 We have previously reported the preparation of the diindenyl analogue of 1,1′-bis(diphenylphosphino)ferrocene (dppf), bis(1-diphenylphosphino-η 5 -indenyl)iron(II) (1), and the characterization of its rac and meso isomers by X-ray crystallographic studies of their tetracarbonylmolybdenum complexes. 13 We now report on the remarkable ring-flipping meso to rac isomerization process of 1 and detailed mechanistic studies that we have carried out to elucidate the mechanism of this process. Our studies also indicate the type of conditions under which ring-flipping processes are most likely to occur and thus need to be considered; this is particularly important in the application of such complexes for asymmetric homogeneous catalysis in which, until now, ring-flipping processes have not been thought to be important.…”