Butyric acid propyl ester

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Structural formula
Structure of butyric acid n-propyl ester
Surname Butyric acid propyl ester
other names
  • Propyl butanoate
  • Propyl butyrate
Molecular formula C 7 H 14 O 2
Brief description

colorless liquid with a sweet odor

External identifiers / databases
CAS number 105-66-8
EC number 203-320-0
ECHA InfoCard 100.003.019
PubChem 7770
ChemSpider 7482
Wikidata Q408216
Molar mass 130.19 g mol −1
Physical state



0.87 g cm −3

Melting point

−95.2 ° C

boiling point

143 ° C


almost insoluble in water

Refractive index

1.4001 (20 ° C)

safety instructions
GHS labeling of hazardous substances
02 - Highly / extremely flammable


H and P phrases H: 226
P: 210-233-280-303 + 361 + 353-370 + 378-403 + 235
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Butyric acid propyl ester (more precisely: butyric acid n- propyl ester) is an ester of butyric acid (butanoic acid) and the alcohol 1-propanol , which smells like strawberries. It is a colorless liquid at room temperature. Butyric acid propyl ester has the empirical formula C 7 H 14 O 2 .


Butyric acid propyl ester can be made from 1-propanol and butyric acid , it is a propyl ester.


It is used in perfumes and as a flavoring agent.

Individual evidence

  1. a b c d e f g Entry on propyl butyrate in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .
  2. David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Organic Compounds, pp. 3-444.