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Cyclopentadienone

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Cyclopentadienone
Names
Preferred IUPAC name Cyclopenta-2,4-dien-1-one
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C5H4O/c6-5-3-1-2-4-5/h1-4HKey: FQQOMPOPYZIROF-UHFFFAOYSA-N
  • InChI=1/C5H4O/c6-5-3-1-2-4-5/h1-4HKey: FQQOMPOPYZIROF-UHFFFAOYAD
SMILES
  • C1=CC(=O)C=C1
Properties
Chemical formula C5H4O
Molar mass 80.086 g·mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Cyclopentadienone is an organic compound with molecular formula C5H4O. The parent cyclopentadienone is rarely encountered, because it rapidly dimerizes. Many substituted derivatives are known, notably tetraphenylcyclopentadienone. Such compounds are used as ligands in organometallic chemistry.

The Knölker complex, derived from a substituted cyclopentadienone, is a catalyst for transfer hydrogenation.

Preparation

Cyclopentadienone can be generated by the photolysis or pyrolysis of various substances (e.g. 1,2-benzoquinone), and then isolated in an argon matrix at 10 K (−263 °C). It dimerizes readily upon thawing the matrix at 38 K (−235 °C).

See also

References

  1. Ogliaruso, Michael A.; Romanelli, Michael G.; Becker, Ernest I. (1965). "Chemistry of Cyclopentadienones". Chemical Reviews. 65: 261–367. doi:10.1021/cr60235a001.
  2. Quintard, A.; Rodriguez, J. (2014). "Iron Cyclopentadienone Complexes: Discovery, Properties, and Catalytic Reactivity". Angewandte Chemie International Edition. 53: 4044–4055. doi:10.1002/anie.201310788.
  3. Casey, Charles P.; Guan, Hairong (2007). "An Efficient and Chemoselective Iron Catalyst for the Hydrogenation of Ketones". Journal of the American Chemical Society. 129 (18): 5816–5817. doi:10.1021/ja071159f. PMID 17439131.
  4. Brown, Roger F. C. (2012). Pyrolytic Methods in Organic Chemistry: Application of Flow and Flash Vacuum Techniques. Elsevier. p. 173. ISBN 978-0-323-15417-8.
  5. Maier, Günther; Franz, Lothar Hermann; Hartan, Hans-Georg; Lanz, Klaus; Reisenauer, Hans Peter (1985). "Kleine Ringe. 54. Cyclopentadienon" [Small rings. 54. Cyclopentadienone]. Chemische Berichte (in German). 118 (8): 3196–3204. doi:10.1002/cber.19851180819.
  6. Horspool, William M.; Lenci, Francesco. CRC Handbook of Organic Photochemistry and Photobiology. Vol. 1–2 (2nd ed.). p. 12-8. ISBN 978-0-203-49590-2.
Salts and covalent derivatives of the cyclopentadienide ion
CpH He
LiCp Be B CpMe N C5H4O F Ne
NaCp MgCp2

MgCpBr

Al Si P S Cl Ar
K CaCp2 ScCp3 TiCp2Cl2

(TiCp2Cl)2
TiCpCl3
TiCp2S5
TiCp2(CO)2
TiCp2Me2

VCp2

VCpCh
VCp2Cl2
VCp(CO)4

CrCp2

(CrCp(CO)3)2

MnCp2 FeCp2

Fe(η-C5H4Li)2
((C5H5)Fe(C5H4))2
(C5H4-C5H4)2Fe2
FeCp2PF6
FeCp(CO)2I

CoCp2

CoCp(CO)2

NiCp2

NiCpNO

Cu Zn Ga Ge As Se Br Kr
Rb Sr Y(C5H5)3 ZrCp2Cl2

ZrCp2ClH

NbCp2Cl2 MoCp2H2

MoCp2Cl2
(MoCp(CO)3)2

Tc RuCp2

RuCp(PPh3)2Cl
RuCp(MeCN)3PF6

RhCp2 PdCp(C3H5) Ag Cd InCp SnCp2 Sb Te I Xe
Cs Ba * LuCp3 HfCp2Cl2 Ta (WCp(CO)3)2 ReCp2H OsCp2 IrCp2 Pt Au Hg TlCp PbCp2 Bi Po At Rn
Fr Ra ** Lr Rf Db Sg Bh HsCp2 Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
 
* LaCp3 CeCp3 PrCp3 NdCp3 PmCp3 SmCp3 Eu Gd Tb DyCp3 Ho ErCp3 TmCp3 YbCp3
** Ac ThCp3
ThCp4 		Pa UCp4 Np Pu Am Cm Bk Cf Es Fm Md No
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