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[ω‐(Phosphanyl)alkyl]cyclopentadienyl Complexes
Author(s) -
Kettenbach Ralf T.,
Bonrath Werner,
Butenschön Holger
Publication year - 1993
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19931260725
Subject(s) - chemistry , cyclopentadienyl complex , alkyl , chelation , medicinal chemistry , ligand (biochemistry) , yield (engineering) , cobalt , catalysis , inorganic chemistry , organic chemistry , receptor , biochemistry , materials science , metallurgy
The syntheses and characterisation of the [ω‐(phosphanyl)alkyl]cyclopentadienyl anions 2, 3, 6–8, 10 , and 11 are described. These anions form metallocenes 12–15 and 17–19 with FeCl 2 · 2 THF and with ZrCl 4 · 2 THF, respectively. With ICo(CO) 4 chelated carbonbyl complexes 23–25, 28 , and 29 are formed. The unchelated intermediate 20 has been detected by IR spectroscopy. The carbonyl chelate complexes are thermally stable. Under photochemical conditions, ligand exchange reactions are possible which in the case of 1,5‐cyclooctadiene proceed with decomplexation of the phosphane arm. This does not prevent a reaction at the cobalt(I) atom; treatment of 35 with diphenylethyne gives the corresponding tetraphenylcyclobutadiene complex 36 in good yield, the phosphane arm remaining uncoordinated.