75627-79-1

Basic information

• Product Name: [NiBr₂(1,2-bis(dicyclohexylphosphino)ethane)]
• Synonyms: [NiBr₂(1,2-bis(dicyclohexylphosphino)ethane)]
• CAS NO: 75627-79-1
• Molecular Weight: 641.113
• Mol File: 75627-79-1.mol

Chemical Properties

• CAS DataBase Reference: [NiBr₂(1,2-bis(dicyclohexylphosphino)ethane)](CAS DataBase Reference)
• NIST Chemistry Reference: [NiBr₂(1,2-bis(dicyclohexylphosphino)ethane)](75627-79-1)
• EPA Substance Registry System: [NiBr₂(1,2-bis(dicyclohexylphosphino)ethane)](75627-79-1)

Safety Data

• Hazardous Substances Data: 75627-79-1(Hazardous Substances Data)

Upstream product

• 91513-98-3 Ni(η(2)-C2H4)(1,2-bis(dicyclohexylphosphino)ethane) 
• 23743-26-2 1,2-bis-(dicyclohexylphosphino)ethane 
• 10035-10-6 hydrogen bromide 
• 172294-42-7 (η(2)-C6H8)Ni(1,2-bis(dicyclohexylphosphino)ethane) 
• 49676-92-8 1,2-dibromocyclohex-1-ene 
• 7726-95-6 bromine 

Downstream Products

• 176730-96-4 Ni₂H₃((C₆H₁₁)2PCH₂CH₂P(C₆H₁₁)2)2⁽¹⁺⁾*B(C₆H₅)4^(1-) = [Ni₂H₃((C₆H₁₁)2PCH₂CH₂P(C₆H₁₁)2)2]B(C₆H₅)4 
• 1037632-74-8 [(Ni(1,2-bis(dicyclohexylphosphino)ethane))2(1,2,4,5-benzenetetrathiolate)] 
• 1037632-72-6 [Ni(1,2-bis(dicyclohexylphosphino)ethane)(S₂C₆H₂S₂CO)] 

Relevant articles and documents

New nickel-containing homogeneous hydrogenation catalysts structures of [Ni(o-MeO-dpppol)Cl2] and [Ni(dcpe)Cl2]

The didentate phosphane ligands 1,3-bis(di(ortho-methoxyphenyl)phosphanyl)-2-propanol (o-MeO-dpppol) and 1,2bis(dicyclohexylphosphanyl)ethane (dcpe) have been used in a study towards catalytic hydrogenation using homogeneous nickel catalysts. The nickel halide complexes [Ni(o-MeO-dpppol)X2] and [Ni(dcpe)X2] (X = Cl, Br or I) have been synthesized and were characterized using electronic absorption and IR spectroscopy. The structures of the complexes [Ni(o-MeO-dpppol)Cl2] and [Ni(dcpe)Cl2] have been determined by X-ray crystallography. The nickel ions in these complexes are in (distorted) square-planar geometries with NiP2Cl2 chromophores. The synthesized halide complexes and in situ mixtures of nickel acetate and the ligands were tested on catalytic activity in homogeneous hydrogenation. The ligand dcpe yields very active catalysts; turnover numbers up to 3000 in 1 h have been obtained. Generally, it appeared that the catalytic activities are higher in methanol than in methanol/dichloromethane mixtures. It was found that the catalytic activities observed for complexes containing the ligand o-MeO-dpppol are less reproducible than those of catalysts with the ligand dcpe. This lower reproducibility is probably related to the fact that the former ligand is more readily oxidized.

Synthesis and reactions of nickel(0) η2-cyclohexyne complexes and X-ray crystal structure of Ni(η2-C6H8)(C6H 11)2PCH2CH2P(C6H 11)2

Reduction of 1,2-dibromocyclohexene with 1% sodium amalgam in the presence of Ni(η2-C2H4)L2 gives cyclohexyne nickel(O) complexes Ni(η2-C6H8)L2 [L2 = 2PPh3 (1), dcpe (2), 2PEt3 (3); dcpe = 1,2-bis(dicyclohexylphosphino)ethane, Cy2PCH2CH2PCy2], which are structurally similar to, but less stable than, the corresponding platinum(O) compounds. The crystal structure of 2 has been determined. The molecule contains a nickel atom bound to η2-cyclohexyne [Ni-C(1) = 1.875(4) A?, Ni-C(2) = 1.867(4) A?] and to dcpe [Ni-P(1) = 2.139-(1) A?, Ni-P(2) = 2.138(1) A?]. The geometry is close to trigonal planar if the midpoint of the coordinated triple bond is regarded as occupying one coordination site, and the C=C distance [1.272(5) A?] is slightly less than that in Pt(η2-C6H8)(PPh3)2 [1.297(8) A?]. Complex 2 reacts with methyl iodide and with CO2 to give insertion products containing nickel(II), NiI(2-MeC6H8)(dcpe) (7) and Ni{C6H8C(O)O}(dcpe)(9), respectively. Dimethyl acetylenedicarboxylate inserts into the Ni-C σ-bond of 9 to give a seven-membered nickelacycle Ni{C(CO2-Me)=C(CO2Me)C6H 8C(O)C-(dcpe) (10).