63407-93-2Relevant academic research and scientific papers
Palladium Catalyzed Alternating Cooligomerization of Ethylene and Carbon Monoxide to Unsaturated Ketones
Keim, Wilhelm,Maas, Heiko,Mecking, Stefan
, p. 430 - 438 (2007/10/02)
Cationic palladium catalysts have been used to cooligomerize ethylene and carbon monoxide.At high ethylene/CO ratios (m/m = 10:1) in methylene chloride as a solvent, unsaturated alternating cooligomers of the general structure RmH (m >/= 1; R = CH2=CH-, CH2=CHCH2CH2- and CH3CH=CHCH2-) were obtained for the first time.Single component catalyst precursors X)>(1+)Y(1-) (PX = Ph2P(CH2)nC(=O)OR, Ph2P(CH2)2P(=O)Ph2, , Ph2P(CH2)2S(=O)Ph, n = 1-3, R = Me, Et; Y(1-) = BF4(1-), SbF6(1-)) with bidentate P,O- and P,S-ligands as well as in situ catalysts with unfunctionalized phosphine ligands were used.With PnBu3 as a ligand, selectivities for ethylvinylketone of 40percent based on the CO converted were obtained.The hemilabile phosphino-ester and phosphino-thiophene ligands behave like monodentate phosphines under catalytic conditions. - Keywords: Cooligomerization, Carbonylation, Palladium, Hemilabile, Unsaturated Ketone
