C

Cyclopentanone

IUPAC: cyclopentanone

C5H8O Organic Compounds CAS 120-92-3
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Quick Reference
Formula / NotationC5H8O
CAS Number120-92-3
Molecular Weight84.12
Melting Point-60.3 °F (NTP, 1992)
Boiling Point267.17 °F at 760 mmHg (NTP, 1992)
Density0.94869 at 68 °F (NTP, 1992) - Less dense than water; will float
SolubilitySol in alcohol, acetone, ether
AppearanceCyclopentanone appears as a clear colorless liquid with a petroleum-like odor. Flash point 87 °F. Less dense than water and insoluble in water. Vapors heavier than air.
Also Known As120-92-3; Adipic ketone; Ketocyclopentane; Ketopentamethylene; Dumasin; Adipinketon; Adipin keton; DTXSID3029154; 220W81TN3S; NSC-4122
CategoryOrganic Compounds

What is Cyclopentanone?

Cyclopentanone is a cyclic ketone that consists of cyclopentane bearing a single oxo substituent. It has a role as a Maillard reaction product.

Formula & Notation

C5H8O

IUPAC Name: cyclopentanone

Other Names / Synonyms: 120-92-3; Adipic ketone; Ketocyclopentane; Ketopentamethylene; Dumasin; Adipinketon; Adipin keton; DTXSID3029154; 220W81TN3S; NSC-4122

Properties & Characteristics

Appearance: Cyclopentanone appears as a clear colorless liquid with a petroleum-like odor. Flash point 87 °F. Less dense than water and insoluble in water. Vapors heavier than air.. Molecular formula: C5H8O. Molecular weight: 84.12 g/mol. Boiling point: 267.17 °F at 760 mmHg (NTP, 1992). Melting point: -60.3 °F (NTP, 1992). Density: 0.94869 at 68 °F (NTP, 1992) - Less dense than water; will float. Solubility: Sol in alcohol, acetone, ether. Vapor pressure: 11.4 [mmHg]. LogP: 0.4.

Physical Data

PropertyValue
Melting Point-60.3 °F (NTP, 1992)
Boiling Point267.17 °F at 760 mmHg (NTP, 1992)
Density0.94869 at 68 °F (NTP, 1992) - Less dense than water; will float
Molecular Weight84.12
SolubilitySol in alcohol, acetone, ether
AppearanceCyclopentanone appears as a clear colorless liquid with a petroleum-like odor. Flash point 87 °F. Less dense than water and insoluble in water. Vapors heavier than air.

Uses & Applications

Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.

Safety Information

Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Cyclopentanone
Formula C5H8O
CAS Number 120-92-3
Molecular Weight 84.12
Synonyms 120-92-3; Adipic ketone; Ketocyclopentane; Ketopentamethylene; Dumasin; Adipinketon; Adipin keton; DTXSID3029154; 220W81TN3S; NSC-4122

Frequently Asked Questions

Cyclopentanone is a cyclic ketone that consists of cyclopentane bearing a single oxo substituent. It has a role as a Maillard reaction product.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.