16842-03-8Relevant articles and documents
In situ high-pressure NMR studies of Co2(Co)6[P(p- CF3C6H4)3]2 in supercritical carbon dioxide: Ligand substitution, hydrogenation, and hydroformylation reactions
Chen, Michael J.,Klingler, Robert J.,Rathke, Jerome W.,Kramarz, Kurt W.
, p. 2701 - 2707 (2004)
The dimeric cobalt complex Co2(CO)6[P(p-CF 3C6H4)3]2 (1) reacts reversibly with hydrogen to produce HCo(CO)3[P(p-CF3C 6H4)3
Preparation and structures of mixed silicon-cobalt carbonyl clusters with Si-H, Si-O or Si-S bonds
Tiel, Martin Van,Mackay, Kenneth M.,Nicholson, Brian K.
, p. 79 - 88 (1993)
Reaction of Si2H6 with 3 molar equivalents of Co2(CO)8 in hexane gives the closo-cluster Co4(μ4-SiCo(CO)4)(CO)11, while with 2, together with an unstable species tentatively identified as OCo2(CO)7>2.Reaction of S(SiH3)2 with Co2(CO)8 gives Co4(μ-S)2(CO)11 and the novel cluster SSi2Co2(CO)14; the latter was shown crystallographically to contain a Co2(CO)6 unit doubly-bridged by two silicon atoms that are in turn linked by the sulphur atom.There is also a terminal Co(CO)4 group attached to each silicon atom.The most notable feature of this structure is an acute Si-S-Si bond angle of 70.3o which leads to a very short formally non-bonded Si...Si distance of 2.498 Angstroem.
Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts
Haumann, Marco,Meijboom, Reinout,Moss, John R.,Roodt, Andreas
, p. 1679 - 1686 (2007/10/03)
The dinuclear complex [Co2(CO)6{P(OPh) 3}2] (2) has been synthesised and was fully characterised. The solid state structure revealed a trans diaxial geometry, no bridging carbonyls, and Co-Co and Co-P bond lengths of 2.6722(4) and 2.1224(4) A, respectively. Catalysed hydroformylation of 1-pentene with 2 was attempted at temperatures in the range 120 to 210°C and pressures between 34 and 80 bar. High pressure spectroscopy (HP-IR and HP-NMR) was used to detect hydride intermediates. High pressure infrared (HP-IR) studies revealed the formation of [HCo(CO)3P(OPh)3] (4) at ca. 110°C, but at higher temperatures absorption bands corresponding to [HCo(CO)4] (3) were observed. The hydride intermediate 4 has also been synthesised and characterised. Upon increased ligand concentration, HP-IR studies showed the formation of new carbonyl absorption bands due to a higher substituted cobalt carbonyl complex-[HCo(CO)2{P(OPh)3}2] (5), which is believed to be catalytically less active. Complex 5 has been synthesised independently and was fully characterised. A low temperature crystal structural study of 5 revealed a trigonal bipyramidal structure with a trans H-Co-CO arrangement and two equatorial phosphite ligands, the Co-P bond lengths being 2.1093(8) and 2.1076(8) A, respectively.
Synthesis and characterization of mo-mo-bonded (fulvalene)dimolybdenum carbonyl complexes containing sterically demanding phosphines
Kovács, István,Baird, Michael C.
, p. 4084 - 4091 (2008/10/09)
The new metal-metal-bonded (fulvalene)dimolybdenum carbonyl complexes FvMo2(CO)4L2 (L = PPh3, PCy3, PXy3; Xy = 3,5-dimethylphenyl) were synthesized via (a) hydride hydrogen atom abstraction
Synthesis of the square-bipyramidal cluster 4-SiMe)2(CO)11> by two routes and its reaction with GeMe2H2. The crystal structures of 4-SiMe)2(CO)11> and 4-SiMe)2(CO)10>
Anema, Skelte G.,Lee, Siew Kim,Mackay, Kenneth M.,Nicholson, Brian K.
, p. 211 - 218 (2007/10/02)
4-SiMe)2(CO)11> (1a) is the major product from the reaction of with (synthesised from SiMeH2Cl and Na2).An alternative, quantitative synthesis of 1a is from SiMeH3 and , 1a reacts with an
Alkylcobalt carbonyls. 9. Alkoxy-, silyloxy-, and hydroxy-substituted methyl- and acetylcobalt carbonyls. Reduction of formaldehyde to methanol by hydridocobalt tetracarbonyl
Sisak, Attila,Sámpár-Szerencsés, Ella,Galamb, Vilmos,Németh, László,Ungváry, Ferenc,Pályi, Gyula
, p. 1096 - 1100 (2008/10/08)
(Alkoxymethyl)-, ((silyloxy)methyl)-, and (hydroxymethyl)cobalt and (alkoxyacetyl)-, ((silyloxy)acetyl)-, and (hydroxyacetyl)cobalt tetracarbonyls and phosphine-substituted derivatives were prepared. The interconversions of these compounds by carbonylatio
The mechanism of the formation of silyl enol ethers from hydrosilanes and organic carbonyl compounds in the presence of cobalt carbonyls. Kinetic investigation of some reaction steps
Kovács, István,Sisak, Attila,Ungváry, Ferenc,Markó, László
, p. 1025 - 1028 (2008/10/08)
The cleavage of isobutyrylcobalt tetracarbonyl with triethylsilane gives (triethylsilyl)cobalt tetracarbonyl, isobutyraldehyde, dicobalt octacarbonyl, and the corresponding unsaturated and saturated silyl ethers. Silyl enol ether was also formed, along wi
Kinetic investigation of the cleavage of n-butyryl- or isobutyrylcobalt tetracarbonyl with hydridocobalt tetracarbonyl or dihydrogen
Kovács, István,Ungváry, Ferenc,Markó, László
, p. 209 - 215 (2008/10/08)
The acylcobalt tetracarbonyls n-C3H7C(O)Co(CO)4 (1) and i-C3H7C(O)Co(CO)4 (2) react with H2 or HCo(CO)4 to yield n-butyraldehyde and isobutyraldehyde, respectively. Th
Synthesis and Reactivity of Silicon Transition Metal Complexes, XIV. Reaction of Cp(CO)2Fe-Substituted Silanes with Dicobaltoctacarbonyl: Synthesis of Silicon Compounds with Two, Three and Four Transition Metal Ligands
Malisch, Wolfgang,Wekel, Hans-Ulrich,Grob, Irmgard,Koehler, Frank H.
, p. 601 - 609 (2007/10/02)
The reaction of Cp(CO)2Fe-SiHCl2 with Co2(CO)8 yields the heteronuclear complex Cp(CO)2Fe-SiCl2-Co(CO)4 (1) and HCo(CO)4. 1 is degradated by AgBF4 to Cp(CO)2Fe-SiF3.PMe3 transforms 1 to Cp(CO)2Fe-SiCl2-Co(CO)3PMe3 (2).LnM-SiH2Me reacts with Co2(CO)8 to give LnM-SiMe-Co2(CO)7 .Starting with Cp(CO)2Fe-SiH3, μ3-Cp(CO)2Fe-SiCo3(CO)9 (4), the second example of a μ3-metallosilylidine tricobalt cluster is obtained in high yield, which is cleaved by acetic acid to Cp(CO)2Fe-Si3 (5).The composition and structure of the silicon transition metal complexes 1-5 is proved by NMR, IR and mass-spectroscopy. 29Si NMR shifts are determined for the first time for tri- and tetra-metalated silicon species. - Key words: Metalation of Silicon Hydrides, Silicon Transition Metal Complexes, Heteronuclear Cluster Compounds
