15906-55-5

Basic information

• Product Name: Co₂(CO)₇(PPh₃)
• CAS NO: 15906-55-5
• Molecular Weight: 576.35
• Mol File: 15906-55-5.mol
• Article Data: 5

Chemical Properties

• CAS DataBase Reference: Co₂(CO)₇(PPh₃)(CAS DataBase Reference)
• NIST Chemistry Reference: Co₂(CO)₇(PPh₃)(15906-55-5)
• EPA Substance Registry System: Co₂(CO)₇(PPh₃)(15906-55-5)

Safety Data

• Hazardous Substances Data: 15906-55-5(Hazardous Substances Data)

Upstream product

• 201230-82-2 carbon monoxide 
• 15226-74-1 dicobalt octacarbonyl 
• 603-35-0 triphenylphosphine 
• 14243-08-4 tricarbonyldi(triphenylphosphine)cobalt⁽¹⁺⁾ tetracarbonylcobaltate^(1-) 
• 15226-74-1 dicobalt octacarbonyl 

Downstream Products

• 1621603-49-3 Co₂(CO)₅(PPh₃)(R)-BINAP 
• 15747-05-4 trans-Cl₂Sn(Co(CO)3PPh₃)2 
• 14243-08-4 tricarbonyldi(triphenylphosphine)cobalt⁽¹⁺⁾ tetracarbonylcobaltate^(1-) 

Relevant articles and documents

Preparation of triphenylphosphane substituted ethoxycarbonylcarbene-bridged dicobalt carbonyl complexes and their application as catalyst precursors in the carbonylation of ethyl diazoacetate to diethyl malonate

The triphenylphosphane substituted derivatives Co2(CO) 6(CHCO2Et)(PPh3), [μ 2-{ethoxycarbonyl(methylene)}-μ 2-(carbonyl)-(tricarbonyl-cobalt) -(triphenylphosphane-dicarbonyl-cobalt) (CoCo)]

Triphenylphosphane-modified cobalt catalysts for the selective carbonylation of ethyl diazoacetate

The triphenylphosphane-substituted carbonyl cobalt complexes Co 2(CO)7(PPh3), Co2(CO) 6(CHCO2Et)(PPh3), and [Co(CO) 3(PPh3)2][Co(CO)4] were found to be more effective precatalysts in the carbonylation of ethyl diazoacetate under atmospheric pressure of carbon monoxide at 10 °C in dichloromethane solution than the parent Co2(CO)8 and Co2(CO) 7(CHCO2Et) complexes. The highly reactive (ethoxycarbonyl)ketene is the primary product of the catalytic carbonylation, which dimerizes in the absence of a proper scavenger. In the presence of ethanol as the trapping reagent diethyl malonate is the final product of the carbonylation reaction. The formation of (ethoxycarbonyl)ketene using the catalyst precursor Co2(CO)7(PPh3) occurs in a catalytic cycle, where Co2(CO)6(PPh3) and Co2(CO)6(CHCO2Et)(PPh3) are the repeating species. The 16e species Co2(CO)6(PPh 3) is involved in the deazotization of ethyl diazoacetate, and Co2(CO)6(CHCO2Et)(PPh3) leads to the (ethoxycarbonyl)ketene formation. In the absence of carbon monoxide or at low CO concentration the reaction of Co2(CO)6(CHCO 2Et)(PPh3) with ethyl diazoacetate is the source of Co2(CO)5(CHCO2Et)2(PPh3), which is not an active catalyst for the carbonylation of ethyl diazoacetate. Using [Co(CO)3(PPh3)2][Co(CO)4] as the catalyst precursor, the intermediary formation of [Co(CO) 3(PPh3)2][Co(CO)3(O=C=CHCO 2Et)] through radical pairs is assumed. Substituting PPh3 in Co2(CO)7(PPh3), Co2(CO) 6(CHCO2Et)(PPh3), and [Co(CO) 3(PPh3)2][Co(CO)4] by polymer-bound PPh3 results in active and reusable catalysts for the selective carbonylation of ethyl diazoacetate in dichloromethane solution at 40 °C and 11 bar of pressure with up to 5.1 mol of product/((mol of catalyst) h) turnover frequency.

The application of polymer-bound carbonylcobalt(0) species in linker chemistry and catalysis

Carbonylcobalt(0) species have been used as linkers between alkynes and a polymer support for the first time. The alkynes may be loaded indirectly onto a phosphine functionalised polymer via their hexacarbonyldicobalt(0) complex, or directly onto a cobalt