25481-30-5

Basic information

• Product Name: RhH(P(C₆H₅)3)2
• CAS NO: 25481-30-5
• Molecular Weight: 628.495
• Mol File: 25481-30-5.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: RhH(P(C₆H₅)3)2(CAS DataBase Reference)
• NIST Chemistry Reference: RhH(P(C₆H₅)3)2(25481-30-5)
• EPA Substance Registry System: RhH(P(C₆H₅)3)2(25481-30-5)

Safety Data

• Hazardous Substances Data: 25481-30-5(Hazardous Substances Data)

Upstream product

• 17185-29-4 carbonylhydridetris(triphenylphosphine)rhodium(I) 
• 14694-95-2 Wilkinson's catalyst 
• 154859-46-8 (η3-1-phenyl-1-oxoethenyl)bis(triphenylphosphine)rhodium(I) 
• 120-46-7 1,3-diphenylpropanedione 

Relevant articles and documents

Photoenhanced homogeneous catalytic hydrogenation of olefins following XeCl excimer laser excitation of RhH(CO)PPh3)3

XeCl excimer laser (308 nm) irradiation of RhH(CO) PPh3)3 accelerates the homogeneous hydrogenation of olefins under mild conditions. Significantly enhanced dark reactions were observed after periods of laser irradiation. These demonstrate the generation of a highly active catalytic species. Furthermore, the apparent quantum yield of the reaction has been estimated to be larger than unity (2.4) under appropriate conditions. XeCL excimer laser-induced acceleration of homogeneous hydrogenation with other catalysts, RhCl(PPh3)3 as well as IrCl(CO)(PPh3)2 was also observed.

(η3-Oxaallyl)rhodium(I) complexes as catalyst precursors for the disproportionation of aldehydes

Addition of 50 equiv of benzaldehyde to a benzene solution of (Ph3P)2Rh(η3-CH2C(Ph)O) (1) resulted in rapid disproportionation of the aldehyde, yielding benzyl benzoate in near quantitative yield. Similar disproportionation reactions occurred with isobutyraldehyde, n-heptanal, and furfural; however, the yields in these reactions were lower. The catalytic efficiency of the (η3-oxaallyl)rhodium(I) complex depended on the α-substitution pattern of the aldehyde, the concentration of the aldehyde, and the polarity of the aldehyde. The labeled complex (Ph3P)2Rh(η3-CH2 13C(Ph)O) (13C-1) transformed during catalysis into two carbon-labeled products, demonstrating that the η3-oxaallyl complex served as a precursor to the actual catalyst. The (η3-allyl)rhodium(I) complex (Ph3P)2Rh(η3-CH2CHCH 2) (5) failed to react with benzaldehyde, but upon addition of 4 equiv of hydrogen gas, catalysis ensued with near quantitative disproportionation of the aldehyde. Rapid disproportionation of benzaldehyde also occurred when (DIPHOS)Rh(C6H6)+ClO4- and 18-crown-6-solubilized PhCH2O-K+ were mixed, establishing the intermediacy of a rhodium alkoxide. A complete mechanistic scheme for oxaallyl modification and disproportionation catalysis is presented.