459790-88-6Relevant articles and documents
Palladium(II) complexes with 1,1′-bis(diphenylphosphino)ferrocenes [Fe(η5-C5R4PPh2)2] n+ (dppf, R = H, n = 0; dppomf, R = Me, n = 0; dppomf+, R = Me, n = 1). Synthesis, characterization, and catalytic activity in ethene methoxycarbonylation
Gusev, Oleg V.,Kalsin, Alexander M.,Peterleitner, Mikhail G.,Petrovskii, Pavel V.,Lyssenko, Konstantin A.,Akhmedov, Novruz G.,Bianchini, Claudio,Meli, Andrea,Oberhauser, Werner
, p. 3637 - 3649 (2008/10/08)
Several palladium(II) complexes with 1,1′-bis(diphenylphosphino)octamethylferrocene (dppomf) and its oxidized form 1,1′-bis(diphenylphosphino)octamethylferrocenium (dppomf) have been synthesized and characterized by spectroscopic and electrochemical methods. For comparative purposes, analogous Pd(II) derivatives with 1,1′-bis(diphenylphosphino)ferrocene (dppf) have been also prepared. Single-crystal X-ray analyses have been carried out for the square-planar mononuclear compounds [Pd(H2O)2(dppf)](OTf)2 and [Pd(H2O)2(dppomf)](OTf)2 and for the binuclear complex [Pd(μ-OPF2O)(dppomf+)]2(BF4) 4·6CH2Cl2 in which two [Pd(dppomf+)]3+ moieties are held together by the oxygen atoms of two bridging PO2F2 groups derived from the oxidative degradation of PF6 ions. Selected dppf and dppomf Pd(II) complexes have been employed as catalyst precursors for the methoxycarbonylation of ethene (600 psi, 1:1 CO/C2H4, 85 °C). It has been found that dppomf generates selective catalysts for the production of methyl propanoate, while dppf leads to a variety of low-molecular-weight oxygenates spanning from methyl propanoate to alternating oligoketones.
