trans-[RhX(CO) L2] complexes (X = anionic ligand, L = tertiaryphosphine) from [Rh4(CO)12], phosphine (L), and acid (HX) is described. A plausible formation pathway is proposed. The electron density on the phosphorus atom in trans-[RhX(CO)L2] decreases and the length of the Rh–P bond increases with an increase in the electronegativity of the anionic ligand, X, in a cis position to the phosphine ligand. The rhodium
A model study of the mechanism of the homogeneous catalytic hydroformylation of formaldehyde
作者:Albert S.C. Chan
DOI:10.1016/s0020-1693(00)82815-7
日期:1993.8
Abstract The anionic mechanism for the Rh-catalyzed hydroformylation of formaldehyde was supported by the synthesis of a key model rhodium acyl intermediate which, upon hydrogenolysis, gave the model product and regenerated the catalyst.
High-Pressure Infrared Studies of Rhodium Complexes Containing Thiolate Bridge Ligands under Hydroformylation Conditions
作者:Montserrat Diéguez、Carmen Claver、Anna M. Masdeu-Bultó、Aurora Ruiz、Piet W. N. M. van Leeuwen、Gerard C. Schoemaker
DOI:10.1021/om990003o
日期:1999.5.1
In situ high-pressure IR spectroscopy studies of the rhodium catalyst systems [Rh2μ-S(CH2)3N(Me2)}2(COD)2]/PR3 (R = Ph, OPh), [Rh2μ-S(CH2)2S}(COD)2]/PPh3, [Rh2μ-S(CH2)4S}(COD)2]2/PPh3, [Rh2μ-XANTOSS}(COD)2]2/PPh3, and [Rh(acac)(CO)2]/PR3 (R = Ph, OPh) revealed the presence of mononuclear rhodium hydride species under hydroformylation conditions (80 °C, 5−30 bar). The activities and selectivities
Rhodium hydride (HRh(CO)(PPh3)3) and rhodium carbonyl (Rh4(CO)8L4) complexes obtained by reaction of Rh(acac)(CO)(L) type complexes with methanol and formaldehyde
作者:A.M. Trzeciak、J.J. Ziółkowski
DOI:10.1016/0022-328x(92)83254-f
日期:1992.5
Rhodium(I) complexes of Rh(acac)(CO)(L) type (where L = P(OMe)3, P(OEt)3, P(OPh)3, P(O-o-MeC6H4)3, PPh3, P(p-MeC6H4)3, PMePh2, AsPh3) react with alcohols and formaldehyde. In absence of free ligand (L) only carbonyl complexes of formula Rh4(CO)8(L)4 (or Rh4(CO)12-x(L)x) are formed. Reaction of Rh(acac)(CO)(PPh3) with methanol or formaldehyde in the presence of free PPh3 leads to the formation of HRh(CO)(PPh3)3
Rh(acac)(CO)(L)类型的铑(I)配合物(其中L = P(OMe)3,P(OEt)3,P(OPh)3,P(O- o- MeC 6 H 4)3,PPh 3,P(p -MeC 6 H 4)3,PMePh 2,AsPh 3)与醇和甲醛反应。在不存在游离配体(L)的情况下,仅形成式Rh 4(CO)8(L)4(或Rh 4(CO)12- x(L)x)的羰基配合物。Rh(acac)(CO)(PPh)的反应3)在游离PPh 3存在下用甲醇或甲醛导致仅形成HRh(CO)(PPh 3)3。
Carbon dioxide activation; formation of trans-(Ph<sub>3</sub>P)<sub>2</sub>Rh(CO)(OCO<sub>2</sub>H) in the reaction of CO<sub>2</sub>with HRh(CO)(PPh<sub>3</sub>)<sub>3</sub>–CO and the determination of its structure by X-ray crystallography
作者:S. Fazley Hossain、Kenneth M. Nicholas、Carol L. Teas、Raymond E. Davis
DOI:10.1039/c39810000268
日期:——
The intermediate produced from the interaction of HRh(CO)(PPh3)3 with CO reacts with carbon dioxide to yield a novel hydrogencarbonate complex, trans-(Ph3P)2-Rh(CO)(OCO2H)(1), whose structure has been established by X-ray crystallography; (1) undergoes reversible loss of CO2