3-Methylpentanoic acid
3-Methylpentanoic acid (CAS: 105-43-1), with the chemical formula CH3CH2CH(CH3)CH2CO2H and a molecular weight of 116.16 g/mol, is a carboxylic acid used as a versatile building block in organic synthesis. This compound serves as a valuable intermediate in the creation of more complex molecules within the pharmaceutical and chemical industries. Its branched structure offers unique reactivity for various chemical transformations.
- IUPAC
- (±)-3-Methylvaleric acid

Organic Synthesis Intermediate
3-Methylpentanoic acid is a key component in the synthesis of various organic compounds. Its carboxylic acid functionality allows for esterification, amidation, and reduction reactions, while the alkyl chain can be further modified.
Pharmaceutical Building Block
This compound serves as a starting material or intermediate in the development of active pharmaceutical ingredients (APIs). Its structure can be incorporated into drug candidates to influence pharmacokinetic or pharmacodynamic properties.
Research and Development
Used in academic and industrial research labs for exploring novel chemical pathways and developing new materials or molecules. Its availability as a fine chemical supports R&D efforts requiring specific branched carboxylic acids.
| Molecular weight | 116.16 |
|---|---|
| Linear formula | CH3CH2CH(CH3)CH2CO2H |
| Assay | ≥97.0% (T) |
| Grade | purum |
| Boiling point | 196-198 °C(lit.) |
| Density | 0.93 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.416(lit.)n20/D 1.416 |

Hazard statements
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 85 °C / 185 °F |
| Transport (UN / ADR) | UN 3265 8 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 34 |
| Safety statements (S) | 26-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 3-Methylpentanoic acid used for?
+
3-Methylpentanoic acid is primarily used as a building block and intermediate in organic synthesis, particularly within the pharmaceutical and chemical industries for the development of complex molecules.
What are the CAS number and chemical formula for 3-Methylpentanoic acid?
+
The CAS number for 3-Methylpentanoic acid is 105-43-1, and its chemical formula is CH3CH2CH(CH3)CH2CO2H.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies 3-Methylpentanoic acid with a purity of ≥97.0% (T), designated as 'purum' grade. We do not represent this product as USP, BP, or EP grade.
How should 3-Methylpentanoic acid be handled safely?
+
3-Methylpentanoic acid is classified as Dangerous (GHS05, Signal Word: Danger, Hazard Statement: H314), causing severe skin burns and eye damage. Appropriate personal protective equipment, including gloves, goggles, and full-face respirators, must be used. Handle in a well-ventilated area, and ensure immediate medical attention in case of exposure.
How is 3-Methylpentanoic acid shipped and exported?
+
3-Methylpentanoic acid is shipped internationally as UN 3265, Class 8, Packing Group II. Tech Serve Solutions is an experienced exporter of fine chemicals, ensuring compliance with all shipping regulations.
How can I request a sample or quote for 3-Methylpentanoic acid?
+
To request a sample or a quotation for 3-Methylpentanoic acid, please contact our sales department through the website or by direct enquiry, providing your specific requirements.
▶ Related products

1-(2-Fluorobenzyl)piperazine
C11H15FN2
Chemical Synthesis
1-(2-Fluorophenyl)biguanide hydrochloride
Chemical Synthesis

1-(2-Fluorophenyl)cyclopropanecarboxylic acid
C10H9FO2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine
C10H13FN2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine monohydrochloride
C10H13FN2 · HCl
Chemical Synthesis
1-(2-Furoyl)-1H-benzotriazole
C11H7N3O2
Chemical Synthesis
1-(2-Furoyl)piperazine
C9H12N2O2
Chemical Synthesis
1-(2-Hydroxy-5-methylphenyl)-3-phenyl-1,3-propanedione
Chemical Synthesis
▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis