91533-64-1Relevant academic research and scientific papers
Novel Basic Ligands for the Homogeneous Catalytic Homologation of Methanol to Ethanol, II. Synthesis and Complex Chemical Behaviour of Potential Bi- and Tridentate P-N and P-O Containing Chelate Ligands
Lindner, Ekkehard,Rauleder, Hartwig,Scheytt, Christoph,Mayer, Hermann August,Hiller, Wolfgang,et al.
, p. 632 - 642 (2007/10/02)
Tridentate P-N and P-O ligands of the type RP(XC5H4N)2 (1a, b, a', b') and PhP(CH2C4H7O)2 (1c'') are obtained by reaction of RPCl2 with 2-hydroxy- and 2-aminopyridine and Li2PPh with tetrahydrofurfuryl chloride, respectvely.In a similar way the potential bidentate ligand Ph2PCH2C4H7O (2c'') is formed by the action of LiPPh2 on ClCH2C4H7O.Potential tridentate ligands as RP(C4H3O)2 (3a'''-c''') with two furyl-phosphorus bonds can be isolated from RPCl2 and furyllithium.The complex chemical behaviour towards Mo(CO)6 or carbonyl derivatives of chromium was elucidated for 2c''' and 3a'''-c''', resulting in the formation of (OC)5MoPPh2CH2C4H7O (4c'') and trans-(OC)4Cr2 (5a'''-c'''), respectively.In the case of 5a''' an X-ray investigation proved 3a'''-c''' to be only monodentate P-ligands. 5a''' crystallizes in the monoclinic space group P21/c with Z = 2. 1c'' is the most versatile species within this series and functions probably as tri-, bi- and monodentate P-O ligand.With 1c'' and 3c''' some homologation experiments of methanol at 200 deg C and 304 bar synthesis gas pressure were carried out. - Key words: Tri- and Bidentate P-N and P-O Ligands, Complexes of Cr, Mo, Structure of trans-(OC)4Cr2, NMR Spectra
