✦ LIBER ✦
Metal π-complexes of benzene derivatives. Part. 38. Pentaphenyltriphosphane(5) as a chelating η12-ligand. Unusual formation of an interannular –(PPh)3–bridge at bis(benzene)chromium
✍ Scribed by Christoph Elschenbroich; Jochen Sebbach; Bernhard Metz
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- German
- Weight
- 318 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
[(l‐6):(1′‐6′)‐η‐Pentaphenyltriphosphane(5)]chromium (8), which is formed from bis(lithio‐η^6^‐benzene)‐chromium and dichlorophenylphosphane, and which is prepared more rationally from bis(chloro‐η^6^‐benzene)‐chromium and K~2~P~3~Ph~3~, is the first sandwich complex featuring an interannular oligophosphane bridge –(PPh)~n~‐, n ≥ 2; ^31^P{^1^H}‐ and ^1^H‐NMR spectra suggest that the stereoisomer 8‐meso~1~ is formed exclusively and that the –(PPh)~3~‐ link in this triphospha[3]chromocyclophane is non‐fluxional in the range 193 < T < 348 K.