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

• Published in: Journal of organometallic chemistry Vol. 580; no. 2; pp. 245 - 256
• Main Authors: Adams, Julian J., Berry, David E., Browning, Jane, Burth, Dirk, Curnow, Owen J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 31.05.1999
• Subjects: Chiral ligands; Heterobimetallic; Indenyl-phosphine complexes; Heterobimetallic; Chiral ligands; Indenyl-phosphine complexes
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/S0022-328X(98)01163-2

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.