Pentanoic acid

C5H10O2

pentanoic acid

CAS109-52-4
GHS05 Gefahrensymbol: Ätzend – Ätzwirkung
Danger

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Identification

CAS Number
109-52-4
EC Number
203-677-2
UN Number
3265
Index Number
607-143-00-3
PubChem CID
7991

Physical-chemical properties

Molecular Formula
C5H10O2
Molar Mass
102.13 g/mol
IUPAC Name
pentanoic acid

Chemical Identifiers

InChI
InChI=1S/C5H10O2/c1-2-3-4-5(6)7/h2-4H2,1H3,(H,6,7)
InChI Key
NQPDZGIKBAWPEJ-UHFFFAOYSA-N

Overview

Pentanoic acid (CAS 109-52-4) is a saturated carboxylic acid with five carbon atoms, exhibiting corrosive properties and characteristic rancid odor. This straight-chain monocarboxylic acid, also known as valeric acid, represents an important intermediate in organic chemistry and industrial applications. With its molecular formula C5H10O2 and molar mass of 102.13 g/mol, pentanoic acid belongs to the family of short-chain fatty acids that occur naturally in various biological systems and can be synthetically produced for commercial use. The compound presents significant safety considerations due to its corrosive nature, classified as Skin Corr. 1B under GHS regulations. The GHS05 pictogram indicates its potential to cause severe skin burns and eye damage upon contact. As a Class 8 substance under ADR transportation regulations, pentanoic acid requires careful handling protocols and appropriate personal protective equipment during storage, transport, and use. Its aquatic chronic toxicity classification (Aquatic Chronic 3) also necessitates environmental protection measures. In industrial applications, pentanoic acid serves primarily as a chemical intermediate in pharmaceutical synthesis, flavor and fragrance production, and specialty chemical manufacturing. The compound finds particular use in the synthesis of esters for artificial fruit flavoring and as a precursor for various pharmaceutical compounds. Unlike more complex organometallic compounds such as tetrachlorostannane or pentachloro-lambda5-phosphane, pentanoic acid offers relatively straightforward handling procedures while maintaining its effectiveness as a synthetic building block. OYSI maintains reliable supply chains for pentanoic acid, ensuring consistent availability for European industrial customers requiring this versatile carboxylic acid intermediate.

Safety & Classification

Danger
Classification:

Skin Corr. 1B; Aquatic Chronic 3

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H314

Causes severe skin burns and eye damage.

H412

Harmful to aquatic life with long lasting effects.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Skin Contact

Harmful

Measures if substance contacts the skin

First Aid Actions

  • +P302IF ON SKIN:
  • +P352Wash with plenty of water.
  • +P361Take off immediately all contaminated clothing.
  • +P313Get medical advice/attention.

Related hazard statements:

Eye Contact

Harmful

Measures if substance gets into the eyes

First Aid Actions

  • +P305IF IN EYES:
  • +P351Rinse cautiously with water for several minutes.
  • +P338Remove contact lenses, if present and easy to do. Continue rinsing.
  • +P313Get medical advice/attention.

Related hazard statements:

General Measures

Emergency 112 | Poison Control: +49 30 19240 (DE), +33 1 45 42 59 59 (FR), +31 30 274 88 88 (NL)

First aid measures are based on CLP classification and associated P-statements. They do not replace the Safety Data Sheet (SDS). In case of emergency, always consult the full SDS and a physician.

Transport (ADR)

UN Number3265
ADR Class8
Packing GroupIII
Tunnel CodeE
Proper Shipping NamePentansäure
Marine PollutantNo

Frequently Asked Questions

What is pentanoic acid?

Pentanoic acid is a saturated carboxylic acid with the molecular formula C5H10O2 and CAS number 109-52-4. This organic compound has a molecular weight of 102.13 g/mol and belongs to the family of straight-chain fatty acids. It is classified as a corrosive substance with skin corrosion properties (Skin Corr. 1B) and poses moderate environmental hazards to aquatic life with chronic effects. The substance requires careful handling due to its corrosive nature.

What are the physicochemical properties of pentanoic acid?

Pentanoic acid is a colorless to pale yellow liquid at room temperature with a characteristic pungent, rancid odor. It has moderate solubility in water and is miscible with most organic solvents including alcohols and ethers. The compound has a boiling point around 186°C and a melting point of approximately -34°C. Its density is about 0.94 g/cm³, making it slightly less dense than water. The substance exhibits typical carboxylic acid properties including acidic behavior and reactivity.

What is pentanoic acid used for?

Pentanoic acid is primarily used as an intermediate in organic synthesis and chemical manufacturing processes. It serves as a building block for the production of esters, which are utilized in flavoring agents, fragrances, and plasticizers. The compound is also employed in pharmaceutical synthesis, polymer production, and as a precursor for various specialty chemicals. Additionally, it finds applications in research and development laboratories for analytical and synthetic purposes in academic and industrial settings.

How to handle pentanoic acid safely?

Pentanoic acid must be handled with appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing due to its corrosive properties. Work should be conducted in well-ventilated areas or under fume hoods to avoid inhalation exposure. Avoid direct skin and eye contact, and ensure emergency eyewash stations and safety showers are readily accessible. Use appropriate tools and containers made of compatible materials, and follow established chemical handling protocols to minimize exposure risks.

How to store pentanoic acid correctly?

Pentanoic acid should be stored in tightly sealed containers made of compatible materials in a cool, dry, well-ventilated area away from heat sources and incompatible substances. Keep containers away from strong bases, oxidizing agents, and metals that may react with acids. Storage areas should be equipped with appropriate spill containment measures and maintained at stable temperatures. Ensure proper labeling and segregation from incompatible chemicals, and regularly inspect containers for signs of corrosion or leakage.

What to do in case of contact with pentanoic acid?

Immediate action is required if contact occurs with pentanoic acid due to its corrosive nature. For skin contact, immediately remove contaminated clothing and flush the affected area with plenty of water for at least 15 minutes. In case of eye contact, rinse immediately with water for at least 15 minutes and seek medical attention promptly. If inhaled, move to fresh air immediately. For ingestion, do not induce vomiting and seek immediate medical attention. Always consult safety data sheets for specific emergency procedures.

How to dispose of pentanoic acid properly?

Pentanoic acid disposal must comply with local, national, and international waste regulations as it is classified as hazardous waste. The substance should never be discharged directly into sewers, waterways, or soil due to its environmental impact classification (Aquatic Chronic 3). Contact licensed hazardous waste disposal companies for proper treatment and disposal. Small quantities may be neutralized carefully under controlled conditions by qualified personnel before disposal, following appropriate environmental and safety protocols established by regulatory authorities.

How to transport pentanoic acid?

Pentanoic acid is classified under ADR Class 8 (corrosive substances) Packing Group III for transportation purposes. It must be packaged in appropriate UN-approved containers and labeled with the corresponding hazard labels including the GHS05 pictogram. Transport documentation must include proper shipping names, UN numbers, and hazard classifications. Vehicles must comply with ADR requirements for corrosive materials, and drivers must have appropriate training and emergency equipment for handling corrosive substance incidents during transport.

Is pentanoic acid subject to specific regulations?

Pentanoic acid is subject to various regulatory frameworks including REACH registration requirements in Europe and CLP classification standards. The substance is classified with the signal word 'Danger' and requires appropriate hazard labeling with GHS05 pictograms. It is not currently listed as a Substance of Very High Concern (SVHC) under REACH. Users must comply with occupational health and safety regulations, environmental protection laws, and chemical safety requirements. Regular safety assessments and proper documentation are mandatory for commercial use.

Where to buy pentanoic acid in Europe?

Pentanoic acid is available through OYSI, a specialized European distributor of technical chemicals. OYSI provides reliable supply chains across Europe with appropriate documentation, safety data sheets, and regulatory compliance support. As a professional chemical distributor, OYSI ensures product quality, proper packaging, and adherence to transportation regulations. Contact OYSI directly to discuss specific requirements, quantities, and delivery arrangements for pentanoic acid supply to meet your industrial or research needs throughout European markets.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.