Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Chromocene> ?p ?o }
- Chromocene abstract "Chromocene, formally known as bis(η5-cyclopentadienyl)chromium(II), is a chemical compound with the condensed structural formula [Cr(C5H5)2]. Each molecule contains an atom of chromium bound between two planar systems of five carbon atoms known as cyclopentadienyl (Cp) rings in a sandwich arrangement, which is the reason its formula is often abbreviated as Cp2Cr. It is an organometallic compound as it has (haptic) covalent chromium–carbon bonds. Chromocene is structurally similar to ferrocene, the prototype for the metallocene class of compounds; however, as it has only 16 valence electrons, it does not follow the 18-electron rule. It is a paramagnetic compound and also highly reducing, both consequences of its low valence electron count. Like structurally related metallocenes, chromocene readily sublimes in a vacuum and is soluble in non-polar organic solvents.Ernst Otto Fischer, who shared the 1973 Nobel Prize in Chemistry for his work on sandwich compounds, was the first to report a synthesis for chromocene. One simple method of preparation involves the reaction of chromium(II) chloride with sodium cyclopentadienide:CrCl2 + 2 NaC5H5 → Cr(C5H5)2 + 2 NaClSuch syntheses are typically conducted in THF; decamethylchromocene, Cr[C5(CH3)5]2, can be prepared analogously from LiC5(CH3)5. Chromocene can also be prepared from chromium(III) chloride in a redox process:2 CrCl3 + 6 NaC5H5 → 2 Cr(C5H5)2 + C10H10 + 6 NaClThe chromium(0) organometallic complex chromium hexacarbonyl can be oxidised by cyclopentadiene in the presence of diethylamine to produce chromocene, the removed protons being reduced to produce hydrogen gas.Cr(CO)6 + 2 C5H6 → Cr(C5H5)2 + 6 CO + H2The structure of chromocene has been verified by X-ray crystallography; the average Cr–C bond length is 215.1(13) pm.Like some other metallocenes, the cyclopentadienyl ligands of chromocene are displaceable. When combined with silica gel, chromocene gives the Union Carbide catalyst for ethylene polymerization, although other synthetic routes exist for the formation of this important catalyst. The chromocene decomposes on the silica surface to generate high reactive organometallic centers that are responsible for the catalysis.Chromocene provides a convenient route for preparing the anhydrous form of chromium(II) acetate, a useful precursor to other chromium(II) compounds. The reaction involves the displacement of cyclopentadienyl ligands by the formation of cyclopentadiene: 4 CH3COOH + 2 Cr(C5H5)2 → Cr2(O2CCH3)4 + 4 C5H6↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑".
- Chromocene iupacName "Bis(η5-cyclopentadienyl)chromium(II)".
- Chromocene thumbnail Chromocene-2D-skeletal.png?width=300.
- Chromocene wikiPageID "5219153".
- Chromocene wikiPageLength "7197".
- Chromocene wikiPageOutDegree "42".
- Chromocene wikiPageRevisionID "668324013".
- Chromocene wikiPageWikiLink 18-Electron_rule.
- Chromocene wikiPageWikiLink Anhydrous.
- Chromocene wikiPageWikiLink Bis(benzene)chromium.
- Chromocene wikiPageWikiLink Carbon.
- Chromocene wikiPageWikiLink Catalysis.
- Chromocene wikiPageWikiLink Category:Cyclopentadienyl_complexes.
- Chromocene wikiPageWikiLink Category:Metallocenes.
- Chromocene wikiPageWikiLink Category:Organochromium_compounds.
- Chromocene wikiPageWikiLink Chemical_compound.
- Chromocene wikiPageWikiLink Chromate_and_dichromate.
- Chromocene wikiPageWikiLink Chromium.
- Chromocene wikiPageWikiLink Chromium(II)_acetate.
- Chromocene wikiPageWikiLink Chromium(II)_chloride.
- Chromocene wikiPageWikiLink Chromium(III)_chloride.
- Chromocene wikiPageWikiLink Chromium_hexacarbonyl.
- Chromocene wikiPageWikiLink Coplanarity.
- Chromocene wikiPageWikiLink Covalent_bond.
- Chromocene wikiPageWikiLink Cyclopentadiene.
- Chromocene wikiPageWikiLink Cyclopentadienyl.
- Chromocene wikiPageWikiLink Debye.
- Chromocene wikiPageWikiLink Diethylamine.
- Chromocene wikiPageWikiLink Ernst_Otto_Fischer.
- Chromocene wikiPageWikiLink Ethylene.
- Chromocene wikiPageWikiLink Ferrocene.
- Chromocene wikiPageWikiLink Hapticity.
- Chromocene wikiPageWikiLink Hydrogen.
- Chromocene wikiPageWikiLink Metallocene.
- Chromocene wikiPageWikiLink Nickelocene.
- Chromocene wikiPageWikiLink Nobel_Prize_in_Chemistry.
- Chromocene wikiPageWikiLink Organometallic_chemistry.
- Chromocene wikiPageWikiLink Paramagnetism.
- Chromocene wikiPageWikiLink Pentamethylcyclopentadiene.
- Chromocene wikiPageWikiLink Picometre.
- Chromocene wikiPageWikiLink Redox.
- Chromocene wikiPageWikiLink Sandwich_compound.
- Chromocene wikiPageWikiLink Silica_gel.
- Chromocene wikiPageWikiLink Sodium_cyclopentadienide.
- Chromocene wikiPageWikiLink Tetrahydrofuran.
- Chromocene wikiPageWikiLink X-ray_crystallography.
- Chromocene wikiPageWikiLinkText "Chromocene".
- Chromocene wikiPageWikiLinkText "Cr".
- Chromocene wikiPageWikiLinkText "chromocene".
- Chromocene imagefilel "Chromocene-2D-skeletal.png".
- Chromocene imagefiler "Chromocene-3D-balls.png".
- Chromocene imagenamel "Chromocene".
- Chromocene imagenamer "Chromocene".
- Chromocene imagesizel "100".
- Chromocene imagesizer "150".
- Chromocene iupacname "Bischromium".
- Chromocene name "Chromocene".
- Chromocene othernames "Dicyclopentadienylchromium".
- Chromocene wikiPageUsesTemplate Template:Chembox.
- Chromocene wikiPageUsesTemplate Template:Chembox_Hazards.
- Chromocene wikiPageUsesTemplate Template:Chembox_Identifiers.
- Chromocene wikiPageUsesTemplate Template:Chembox_Properties.
- Chromocene wikiPageUsesTemplate Template:Chembox_Related.
- Chromocene wikiPageUsesTemplate Template:Chembox_Structure.
- Chromocene wikiPageUsesTemplate Template:Hazchem_Xi.
- Chromocene wikiPageUsesTemplate 22.
- Chromocene wikiPageUsesTemplate 38.
- Chromocene wikiPageUsesTemplate Template:S26.
- Chromocene wikiPageUsesTemplate 39.
- Chromocene wikiPageUsesTemplate Template:S45.
- Chromocene subject Category:Cyclopentadienyl_complexes.
- Chromocene subject Category:Metallocenes.
- Chromocene subject Category:Organochromium_compounds.
- Chromocene hypernym Compound.
- Chromocene type ChemicalCompound.
- Chromocene type ChemicalSubstance.
- Chromocene type Cycloalkene.
- Chromocene type Redirect.
- Chromocene type ChemicalObject.
- Chromocene type Thing.
- Chromocene type Q11173.
- Chromocene comment "Chromocene, formally known as bis(η5-cyclopentadienyl)chromium(II), is a chemical compound with the condensed structural formula [Cr(C5H5)2]. Each molecule contains an atom of chromium bound between two planar systems of five carbon atoms known as cyclopentadienyl (Cp) rings in a sandwich arrangement, which is the reason its formula is often abbreviated as Cp2Cr. It is an organometallic compound as it has (haptic) covalent chromium–carbon bonds.".
- Chromocene label "Chromocene".
- Chromocene sameAs Q418966.
- Chromocene sameAs كروموسين.
- Chromocene sameAs Category:Chromocene.
- Chromocene sameAs Chromocen.
- Chromocene sameAs Cromoceno.
- Chromocene sameAs کروموسن.
- Chromocene sameAs Chromocène.
- Chromocene sameAs Cromocene.
- Chromocene sameAs クロモセン.
- Chromocene sameAs Chromoceen.
- Chromocene sameAs m.0d8fmq.
- Chromocene sameAs Hromocen.
- Chromocene sameAs Hromocen.
- Chromocene sameAs Q418966.
- Chromocene sameAs 二茂铬.
- Chromocene wasDerivedFrom Chromocene?oldid=668324013.
- Chromocene depiction Chromocene-2D-skeletal.png.