Propyl butyrate
Propyl butyrate (CAS: 105-66-8) is an ester with the linear formula CH3CH2CH2COOCH2CH2CH3 and a molecular weight of 130.18 g/mol. This clear, colourless liquid possesses a characteristic fruity odour. It finds utility as a building block in organic synthesis and as a component in flavour and fragrance formulations due to its pleasant aroma.
- IUPAC
- n-Propyl-n-butanoate
- Synonyms
- n-Propyl butyrateButanoic acid, propyl esterPropyl butanoate

Organic Synthesis
Propyl butyrate serves as a valuable intermediate and building block in various organic synthesis pathways. Its ester functional group allows for diverse chemical transformations.
Flavour and Fragrance Industry
With its distinct fruity notes, propyl butyrate is employed in the creation of artificial flavourings and perfumes. It contributes to fruity profiles in various consumer products.
Laboratory Reagent
This compound is utilised as a reagent in research and development settings for chemical studies and experimentation.
| Molecular weight | 130.18 |
|---|---|
| Linear formula | CH3CH2CH2COOCH2CH2CH3 |
| Assay | 99% |
| Boiling point | 142-143 °C(lit.) |
| Density | 0.873 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.4(lit.) |


Hazard statements
- H226Flammable liquid and vapour
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 37 °C / 98.6 °F |
| Transport (UN / ADR) | UN 3272 3 / PGIII |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 10-36/37/38 |
| Safety statements (S) | 16-26-36 |
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 Propyl butyrate used for?
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Propyl butyrate is primarily used as a building block in organic synthesis and in the flavour and fragrance industry due to its fruity aroma.
What are the CAS number and formula for Propyl butyrate?
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The CAS number for Propyl butyrate is 105-66-8, and its linear formula is CH3CH2CH2COOCH2CH2CH3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Propyl butyrate with an assay of 99%. This product is not represented as USP, BP, or EP grade.
What are the safety considerations when handling Propyl butyrate?
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Propyl butyrate is a flammable liquid (H226) and an irritant to the skin, eyes, and respiratory system (H315, H319, H335). Appropriate personal protective equipment, including eyeshields, gloves, and suitable respiratory protection, should be used. Handle in a well-ventilated area away from ignition sources.
How is Propyl butyrate packed, shipped, and exported?
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Tech Serve Solutions professionally packs, ships, and exports chemicals globally, adhering to all relevant transportation regulations. Specific packaging details are available upon request.
How can I request a sample or a quote for Propyl butyrate?
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To request a sample or a quote for Propyl butyrate, please contact our sales team through the website or by phone.
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