12078-23-8Relevant academic research and scientific papers
CoCpBr INTERMEDIATES IN THE CYCLOPENTADIENYLATION OF CoBr2 WITH NaCp
Koelle, U.,Sistig, F.,Gersdorf, J.
, p. 253 - 258 (1982)
Reaction of CoBr2 and NaCp (Cp = η5-C5H5) at low temperature followed by addition of a diene or acetylene gives the complexes CoCp(diene).The scope and mechanism of this novel reaction have been investigated.
UEBERGANGSMETALL-METHYLEN-KOMPLEXE. LII. SYNTHESEKONZEPTE ZUM AUFBAU HETERODINUCLEARER METALL-METALL-MEHRFACHBINDUNGEN
Herrmann, Wolfgang A.,Barnes, Craig E.,Serrano, Ricardo,Koumbouris, Basile
, p. C30 - C34 (1983)
Novel heterodinuclear metal-metal multiple bonds are accessible by simple high-yield metal-metal coupling reactions: the cobalt-iridium complex (η5-C5H5)Co(μ-CO)2Ir(η5-C5Me5) (Me=CH3; 3) is formed as the main product from the reactio
Dihalocarbonylcyclopentadienylcobalt complexes
Heck, Richard F.
, p. 855 - 857 (1965)
Halogens react with dicarbonylcyclopentadienylcobalt to form dihalocarbonylcyclopentadienylcobalt complexes and carbon monoxide. The dihalocarbonylcyclopentadienylcobalt complexes react very readily with coordinating compounds such as phosphite esters and
STOICHIOMETRIC HYDROGENATIONS USING TETRACARBONYLCOBALTATE(-I)
Ungvary, F.,Sisak, A.,Marko, L
, p. 373 - 378 (1980)
Methanolic solutions of tetracarbonylcobaltate(-I) in the presence of an acid are simple and useful reducing agents for the selective hydrogenation of conjugated carbon-carbon double bonds.The reaction has the following stoichiometry:
Facial coordination of cyclooctatetraene to a Co2Ni triangle in a heterometallic trinuclear cluster complex
Wadepohl, Hubert,Gebert, Stefan,Merkel, Rüdiger,Pritzkow, Hans
, p. 142 - 147 (2002)
Reaction of [(η-C5H5)NiCo3(CO)9] (5) with 1,3,5,7-cyclooctatetraene or 1,4-(SiMe3)2C8H6, respectively, yields the complexes [Co2Ni(CO)6(μ3/
Photochemistry of Dicarbonylcyclopentadienylcobalt in Frozen Gas Matrices at 12 K. Infrared Spectroscopic Evidence for Tricarbonylcyclopentadienylcobalt and Carbonylcyclopentadienyl(dinitrogen)cobalt Complexes
Chrichton, Oliver,Rest, Antony J.,Taylor, David J.
, p. 167 - 173 (1980)
Infrared spectroscopic evidence, including (13)CO labelling and energy-factored CO force-field fitting, is presented to show that on photolysis of 5-C5H5)(CO)2> at high dilution in CO and N2 matrices at 12 K new species 3-C
Nitrosyl-bridged Cyclopentadienyl-cobalt and -rhodium Cations
Clamp, Sara,Connelly, Neil G.,Payne, John D.
, p. 897 - 899 (1981)
(M = Co or Rh, R = H or Me) and + afford + (3) and then + (4) which decarbonylates to give + (5); complex (4) undergoes reversible nitrosyl-bridge cleavage with alken
Synthesis, Crystal and Molecular Structures, and Reactions of a Benzodicobaltacyclohexene, a Thermally Derived Mononuclear o-Xylylene Complex, and an Unsymmetrical Phosphine-Derived Dinuclear Complex
Hersh, William H.,Hollander, Frederick J.,Bergman, Robert G.
, p. 5834 - 5846 (1983)
Alkylation of Na2 (Cp = η5-cyclopentadienyl) with α,α'-dibromo-o-xylene gives bis(μ-carbonyl)(μ-o-xylylene)bis5-cyclopentadienyl)cobalt>(Co-Co) (1), the first dimetallacycloxene.The X-ray crystal structure of the derivative analogue 8 hyving η5-methylcyclopentadienyl rings was solved (2371 reflections; R = 2.64percent; space group P; a = 9.1045 (11), b = 9.5465 (13), c = 11.8147 (16) Angstroem; α = 83.730 (11) deg; β = 81.414 (10) deg, γ = 63.392 (10) deg; Z = 2, dcalcd = 1.598 g/cm3) and shows a six-membered ring containing two cobalt atoms with a Co-Co ''single bond'' length of 2.438 Angstroem; the dimetallacycle ring adopts a boat conformation with a folding angle of 58.5 deg.Compound 1 undergoes slow decomposition at room temperature in solution to give CpCo(CO)2 (10) and new complex (η5-cyclopentadienyl)(η4-o-xylylene)cobalt (11).The crystal structure of 11 (1370 reflections; R = 3.90percent; space group Pbca; a = 7.6286 (40), b = 11.6094 (16), c = 23.7196 (24) Angstroem; Z = 8, dcalcd = 1.443 g/cm3) is that of a diene complex in which the o-xylylene ligand consists of a delocalized butadiene portion and a nonaromatic six-membered carbocycle.Photolysis of 1 also leads to 10 and 11 as primary products.Carbonylation of mononuclear o-xylylene complex 11 at 70 deg C gives 10 and the CO insertion product 2-indanone (13).Carbonylation of 1 yields 10 and dimers 14 and 15 of free o-xylylene (4).Reactions of 1 with phosphines and phosphites (L) also give 14 and 15 as well as CpCo(CO)L (16), but the unstable dinuclear intermediate 17, proposed to be Cp2Co2(μCO)2(L), was detected in the phosphine reactions.This material can also be prepared from the dinuclear compound 2 (3) and phosphines.Compound 17 (L = PMe3) decomposes via parallel first and second-order pathways in the presence of PMe3, while 17 (L = PPh3) decomposes primarily via a first-order pathway in the presence of PPh3.The X-ray crystal structure of an analogue of 17, (MeCp)2Co2(μ-CO)2(PPhMe2) (20), was determined (2664 reflections; R = 2.76percent; space group P21/c; a = 10.0035 (14), b = 14.0816 (13), c = 14.4761 (18) Angstroem; β = 92.042 (11) deg; Z = 4, dcalcd = 1.533 g/cm3) and indicates the presence of a Co-Co ''single bond'' (2.416 Angstroem); the phosphine is bound to one of the cobalt atoms, and the two carbonyls are semibridging, with the closer contacts being to the cobalt atom not bound to phosphine.
REARRANGEMENT OF ETHYLENE TO HYDRIDO AND ETHYLIDYNE LIGANDS AND FORMALDEHYDE DECARBONYLATION IN THE SYNTHESIS OF (η5-C5H5)4Co4> DERIVATIVES. CRYSTAL STRUCTURE OF 5-C5H5)4Co4(μ3-CO)2>
Gambarotta, Sandro,Floriani, Carlo,Chiesi-Villa, Angiola,Guastini, Carlo
, p. C6 - C10 (1985)
Rearrangement of ethylene to hydrido and ethylidyne ligands bonded to two faces of the tetrahedral skeleton (Cp=η5-C5H5) in 3-H)(μ3-CCH3)> was observed upon heating a hexane solution of ; treatment of with formaldehyde gave 3-CO)2>, the X-ray structure of which is reported.
Synthetic and structural studies on (η5:η5-fulvalene)bimetallic compounds derived from (η5:η5-fulvalene)dithallium
Rausch, Marvin D.,Spink, W. Craig,Conway, Brian G.,Rogers, Robin D.,Atwood, Jerry L.
, p. 227 - 252 (1990)
A reaction between halide-free solutions of dihydrofulvalene and thallium ethoxide has produced (η5 : η5-fulvalene)dithallium (1) in 85-100percent yield.Reactions of 1 with carbonyl halides of cobalt, rhodium, iridium, manganese and rhenium produce corresponding homobimetallic fulvalene metal carbonyls (2, 5, 9-11) in yields of 52-94percent.The rhodium complex (η5 : η5-C10H8)Rh2(CO)4 (5) reacted with trimethylamine-N-oxide dihydrate to form a tricarbonyl derivative (η5 : η5-C10H8)Rh2(μ-CO)(CO)2 (6) that contained a bridging carbonyl group and a rhodium-rodium bond.The bridging carbonyl substituent could be replaced by a bridging methylene group by reaction of 6 with N-methyl-N-nitrosourea.Tetra(η2-ethylene)-, bis(η4-1,2,5,6-cyclooctadiene)-, and bis(η4-1,2,5,6-cyclooctatetraene)(η5 : η5-fulvalene)dirhodium (12-14) have been prepared in high yields by reactions of 1 with the corresponding chloro(diolefin)rhodium dimers.Variable temperature 1H NMR studies on the tetraethylene complex 12 demonstrated that the ethylene ligands are fluxional, with ΔG+ 65 +/- 1 KJ/mol.Photolysis of 14 with two equivalents of (η2-C2H4)2(η5-C5H5)Rh has afforded the tetranuclear complex bis 5-cyclo-pentadienyl)rhodium(μ-cyclooctatetraene)>(η5 : η5-fulvalene)dirhodium (15) in 27percent yield.The single crystal X-ray structures of 2,5,10, and 12 have been carried out.Each consists of an η5 : η5-fulvalene dianion bridging two metal centers which lie on opposite sides on the fulvalene plane.In each case the formula unit resides around a crystallographic center of inversion. 2 and 5 are isostructural crystallizing in the monoclinic space group P21/c with a 7.938(6), b 8.223(7),c 10.884(8) Angstroem, β 109.34(4)deg, and Dcalc 1.77 gcm-3 for Z = 2 (2) and a 8.149(1), b 8.420(1), c 10.498(4) Angstroem, β 107.27(2)deg and Dcalc 2.15 gcm-3 for Z = 2 (5).The average M-C(η5) and M-CO distances are Co-C(η5) 2.10(2) Angstroem, Co-CO 1.734(6) Angstroem (2) and Rh-C(η5) 2.27(3) Angstroem, Rh-CO 1.864(3) Angstroem (5). 10 is monoclinic P21/n with a 10.366(6), b 6.986(4), c 11.910(5) Angstroem, β 115.07(4)deg and Dcalc 1.73 gcm-3 for Z = 2.The average Mn-C(η5) and Mn-CO distances are 2,115(5) and 1.802(6) Angstroem, respectively. 12 is triclinic, P1, with a 8.068(1), b 9.998(4), c 11.509(3) Angstroem α 67.48(2), β 69.01(2), χ 80.51(3)deg and Dcalc 1.85 gcm-1 for Z = 2.There are two unique molecular units each residing around a crystallographic center of inversion.The two differ by a small rotation of the Rh(C2H4)2 fragments.The average Rh-C(η5) and Rh-C(η2) separations are 2.25(3) and 2.129(9) Angstroem, respectively.
