80319-87-5Relevant articles and documents
THE PREPARATION AND REACTIONS OF BIS(PYRAZOLYL)PHENYLMETHANE COMPLEXES OF RHODIUM(I)
Leung, Ping Y.,Peterson, Louis K.
, p. 409 - 420 (2007/10/02)
The complexes x (I), (II), (III) and +Cl- (IV) have been prepared via the reactions of the bis-(pyrazolyl)phenylmethane ligands PhCH(H2pz)2 (LL; H2pz = pyrazolyl) and PhCH(Me2pz)2 (MeLL; Me2pz = 3,5-dimethylpyrazolyl) with 2 and 2 (cod = cyclooctadiene).Complex IV reacts with NaBPh4 to form +BPh4- (V).III and IV react with carbon monoxide to give +- (VI).Complexes I and III give neutral solutions in methanol, while II and IV behave as 1:2 and 1:1 electrolytes, respectively.The rhodium(I) centre is typically four-coordinate in I, II, IV-VI, and five-coordinate in III.The ligands LL and MeLL show bidentate chelating behaviour in all of the above complexes, with the exception of II, where LL bridges two different RhI moieties.Reactions with H2, HCl and Ph3P are described.Complex III functions as a homogeneous catalyst, in neutral methanolic solution, for the hydrogenation of olefins, but is ineffective for the hydrogenation of α,β-unsaturated aldehydes and ketones.
