109740-99-0Relevant academic research and scientific papers
NEUARTIGE BASISCHE LIGANDEN FUER DIE HOMOLOGENKATALYTISCHE METHANOLCARBONYLIERUNG V. KOMPLEXCHEMISCHES VERHALTEN MEHRZAENIGER FURFURYLPHOSPHANE UND IHR EINFLUSS AUF DIE SELEKTIVITAET UND DEN UMSATZ BEI DER ETHANOLSYNTHESE AUS METHANOL
Lindner, Ekkehard,Scheytt, Christoph,Wegner, Peter
, p. 311 - 324 (1986)
The potentially four-, three- and bidentate furfurylphosphanes RP(CH2C4H3O)2 (3a-e) (R = Ph (a), Mes (b), Me (c), t-Bu (d), CH2C4H3O (e), Et (f) and Ph2PCH2C4H3O (5) react with (OC)5WTHF to give pentacarbonyltungsten complexes (OC)5WPR(CH2C4H3O)2 (4a-e) and (OC)5WPPh2CH2C4H3O (6), respectively.Irradiation of ether solutions of 4a-e and 6 leads to the formation of the tetracarbonyltungsten complexes (OC)4WPR(CH2C4H3O)2 (8a-e) and (OC)4WPPh2CH2C4H3O (9), respectively.In a similar way (OC)4WPPh2C2H4(CH3)H2O (10) is obtained from Ph2PC2H4C4(CH3)H2O (1) and (OC)5WTHF via the intermediate compound (OC)5WPPh2C2H4(CH3)H2O (7).Furyl-oxygen-metal interactions do not occur.Only one furyl ring is η2-bonded to the metal in 8a-e, 9 and 10.As was exemplified by 8e and 9 this very weak bond is easily cleaved by phosphanes.The influence of the furylphosphanes 1, 3a-f and their phosphonium salts Br (13a,d,e), I (13f) and Br (14) and the furylphosphanes RP(C4H3O)2 (15a,c,d) and Ph2PC4H3O (16) on the homologation of methanol to ethanol was investigated using cobalt as catalyst metal and iodine as a promotor.In accordance with their complex chemical behaviour the best results with respect to selectivity and conversion were obtained with the bidentate ligands 5 and 16.
