| Popis: |
Acetyl complexes of iron(II) and ruthenium(II) of the type (π-C 5 H 5 )(CO)LM(COCH 3 ), where L = PPh 3 , P(OPh) 3 , P(cyclohexyl) 3 , PMe 2 Ph or CO for M = Fe, and PPh 3 for M = Ru, are rapidly reduced to the corresponding ethyl complexes by BH 3 · THF or B 2 H 6 /C 6 H 6 . In some cases hydrido complexes of the type (π-C 5 H 5 )(CO)LMH are also formed. The reaction has been studied by use of 1 H NMR and the spectrum of (π-C 5 H 5 )(CO)(PPh 3 )FeC 2 H 5 , which shows several unusual features, is discussed in detail. It is suggested that the rate of reduction increases with increasing electron density at the metal centre. Acetyl complexes of other transition metals, i.e. Ir, Pt, Pd, Co and Mo, are also reduced to the corresponding ethyl compounds by B 2 H 6 /C 6 H 6 . |
