
Zeitschrift fur Naturforschung, B: Chemical Sciences p. 187 - 200 (1996)
Update date:2022-08-04
Topics:
Bergs, Ralph
Kr?mer, Roland
Maurus, Michael
Schreiner, Bernhard
Urban, Reinhold
Missling, Christopher
Polborn, Kurt
Sünkel, Karlheinz
Beck, Wolfgang
A series of cyclopentadienyl and pentamethylcyclopentadienyl complexes of cobalt, rhodium, iridium, ruthenium and chromium with α-amino-acid esters (L) as ligands was prepared and characterized: Cp*(Cl)2M(L) (1, 2: M = Rh, Ir), Cp(I)2Co(L) (4), [Cp(Ph3P)2Ru(L)]+BF-4 (6), [Cp(OC)(Ph3P)Ru]+BF-4 (7) and the paramagnetic compounds Cp*(Cl)2Ru(L) (8) and Cp(Br)2Cr(L) (9). AlaOMe and HisOMe form N,O and N,N chelate complexes [Cp*(Cl)M(alaOMe)]+BF-4 (3: M = Rh, Ir), [Cp(I)Co(hisOMe)]+BF4. Cp*Co(CO)I2 and GlyOMe gave the N,O-dipeptide ester complex Cp*(I)Co(glyglyOMe)]+BF-4 (5). The crystal structures of Cp(I)2Co(glyOEt) and Cp*(Cl)2Ru(alaOMe) were determined by X-ray diffraction. The complexes 1 and 2 undergo ester exchange reactions with CD3OD. [Cp*MCl2l2 (M = Rh, Ir) catalyze the exchange of the ethoxy group in Me2NCH2CO2Et by CD3OD.
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Doi:10.1139/v96-038
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