231633-47-9Relevant academic research and scientific papers
Facile meso to rac isomerization of the bis-planar chiral ferrocenyldiphosphine bis (1-(diphenylphosphino)-η5-indenyl)iron (II)
Curnow, Owen J.,Fern, Glen M.
, p. 2827 - 2829 (2002)
The facile meso to rac isomerization of the bis-planar chiral ferrocenyldiphosphine was reported. The isomerization took place overnight in tetrahydrofuran at room temperature. The isomerization was accelerated by salts but did not occurred on chloroform
Electrochemistry and UV/visible spectroscopy of phosphino-substituted bis(η5-indenyl)iron(II) complexes
Curnow, Owen J.,Fern, Glen M.,Jenkins, Elizabeth M.
, p. 643 - 647 (2007/10/03)
Six phosphino-functionalized diindenyl ferrocenes have been characterized by UV/vis spectroscopy and cyclic voltammetry in dichloromethane. The complexes contain the following ligands: 1-diphenylphosphino- (1), 1-diphenylphosphino-2-methyl- (2), 1-dipheny
Synthesis, structures and rac/meso isomerization behaviour of bisplanar chiral bis(phosphino-η5-indenyl)iron(II) complexes
Curnow, Owen J.,Fern, Glen M.,Hamilton, Michelle L.,Jenkins, Elizabeth M.
, p. 1897 - 1910 (2007/10/03)
Syntheses of the phosphinoindenes 1-(diphenylphosphino)-3-methylindene (1b), 3-(diphenylphosphino)-2-methylindene (1c), 1-(diphenylphosphino)-2,3-dimethylindene (1d), 4,7-dimethyl-3-(diphenylphosphino)indene (1e), 1-(diphenylphosphino)-3,4,7-trimethylindene (1f) and 3-(diisopropylphosphino)indene (1i) were carried out by treatment of the appropriate indenide with the appropriate chlorophosphine. The silylphosphinoindene 3-(diphenylphosphino)-1-(trimethylsilyl)indene (1h) was prepared by treatment of the indenide of 3-(diphenylphosphino)indene (1a) with trimethylsilylchloride. These indenes, in addition to 1a, were then used, after deprotonation with BuLi, to prepare the corresponding indenyl ferrocenes, 2a-2e, 2h and 2i, by treatment with ferrous chloride in a 2:1 ratio. These compounds were characterized by 1H, 13C, and 31P NMR spectroscopy, as well as by mass spectrometry, except for the highly-sensitive diisopropylphosphine 2i that could only be characterized by 31P NMR spectroscopy. All of these ferrocene complexes are bisplanar chiral systems that can potentially form rac and meso isomers. In all cases both isomers were observed but for 2b and 2h only one could be isolated. The rac isomers of complexes 2a, 2b, 2d, and 2e, as well as the meso isomer of 2e, were studied by X-ray crystallography. Only complexes 2a and 2i were observed to undergo rac/meso isomerization processes at ambient temperature in THF solvent. We were unable to prepare the sterically congested hexamethylferrocene 2f. Generally, it was found that increasing substitution on the indenyl ring increases the reactivity and sensitivity of the ferrocene.
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-C9H 6)2Fe
Adams, Julian J.,Berry, David E.,Browning, Jane,Burth, Dirk,Curnow, Owen J.
, p. 245 - 256 (2007/10/03)
The preparation, isolation and characterisation of 1,3-bis(diphenylphosphino)indene (1) from indene and chlorodiphenylphosphine is described. The reaction of 1 with selenium gives the diselenide adduct 1,3-bis(diphenylselenophosphino)indene (2) which was characterised crystallographically. Deprotonation of 1 and treatment with ferrous chloride gives the unstable tetraphosphine complex bis(1,3-bis(diphenylphosphino)indenyl)iron(II) (3). Complex 3 decomposes to the diphosphine complex bis(1-diphenylphosphinoindenyl)iron(II) (4) via replacement of one diphenylphosphine substituent per indenyl ligand by a hydrogen atom. Complex 4 was also prepared by treatment of two equivalents of 1-diphenylphosphinoindenide with ferrous chloride. The heterobimetallic complex tetracarbonyl(bis(1-diphenylphosphinoindenyl)iron(II))molybdenum(0) (5) was also prepared and crystal structures of both the meso (5a) and C2-symmetric racemic (5b) isomers are reported.
