85250-16-4Relevant academic research and scientific papers
Phosphorus- and arsenic-bridged [1]ferrocenophanes. 3. Hydroformylation catalyzed by the products of the interaction of Co2(CO)8 with 1,1′-ferrocenylenephenylphosphine oligomers and polymers
Fellmann, Jere D.,Garrou, Philip E.,Withers, Howard P.,Seyferth, Dietmar,Traficante, Daniel D.
, p. 818 - 825 (2008/10/08)
Reactions of Co2(CO)8 with ferrocenylphosphine oligomers of the type H[-(η5-C5H4)Fe(η5-C 5H4PPh)-]xPh (I, x= 1-4) and Ph2P[-(η5-C5H4)Fe(η 5-C5H4PPh)-]XPh (III, x = 1, 2) or polymers of the type, H[-(η5-C5H4)Fe(η5-C 5H4PPh)-]x]OH (II, M?w 8900-161 000 amu) have been studied. Detailed IR and 31P NMR spectroscopic investigations revealed that the polymeric ligands chelate Co in a tridentate fashion, similar to I (x = 3) when a high P/Co ratio is used. Use of such Co catalysts at 170-190°C for the hydroformylation of 1-hexene revealed reactivity and selectivity similar to those of PPh3 for ligands of type I and type III, while Co complexes of the polymers, II, demonstrated a M?w-dependent activity and a lower selectivity to alcohols. It is felt that the observed tendency for tridentate chelation in these complexes inhibits the aldehyde-to-alcohol reduction step. A 31P NMR study of the cobalt complex of the trimer I (x = 3) provided evidence for the presence of two enantiomeric isomers and selective quadrupolar broadening in the equatorial direction.
