2-Methyl-2-pentenoic acid

CAS NO.：3142-72-1
Empirical Formula: C6H10O2
Molecular Weight: 114.14
MDL number: MFCD08277250
EINECS: 221-552-0
SAFETY DATA SHEET (SDS)
Update Date: 2026-06-04 16:00:12

What is 2-Methyl-2-pentenoic acid?

Description

May be prepared by distillation of 2-hydroxy-2-methylvaleric acid (m-form).

Chemical properties

white semi-transparent crystalline

Chemical properties

With a dry acid note, 2-Methyl-2-pentenoic Acid is found in the odor of strawberries.The acid can be prepared from the corresponding saturated one by α-bromination followed by dehydrobromination.
It is used in fragrances to enhance fruity notes and in strawberry flavors.

Chemical properties

2-Methyl-2-pentenoic acid has a fruity odor.

Occurrence

Reported found in strawberry

The Uses of 2-Methyl-2-pentenoic acid

2-Methyl-2-pentenoic Acid (CAS# 3142-72-1) can be used for cleansing and refreshing hair and scalp. It can also be used to store and cure food products, and for providing a long-lasting strawberry odor.

Preparation

By distillation of 2-hydroxy-2-methylvaleric acid (cis-form).

Definition

ChEBI: 2-Methyl-2-pentenoic acid is a methyl-branched fatty acid. It is a conjugate acid of a 2-methyl-(2E)-pentenoate(1-).

Taste threshold values

Taste characteristics at 50 ppm: sour, acidic, sweaty, berry and fruit-like.

Properties of 2-Methyl-2-pentenoic acid

Melting point:	26-28 °C(lit.)
Boiling point:	123-125 °C30 mm Hg(lit.)
Density	0.979 g/mL at 25 °C
vapor density	>1 (vs air)
refractive index	n20/D 1.46(lit.)
FEMA	3195 \| 2-METHYL-2-PENTENOIC ACID
Flash point:	226 °F
storage temp.	Sealed in dry,Room Temperature
pka	5.00±0.19(Predicted)
form	powder to lump
color	White to Almost white
Odor	at 10.00 % in dipropylene glycol. dry acid sweaty strawberry woody fruity jam
FreezingPoint	20.0 to 25.0 ℃
JECFA Number	1210
CAS DataBase Reference	3142-72-1(CAS DataBase Reference)
NIST Chemistry Reference	2-Pentenoic acid, 2-methyl-(3142-72-1)
EPA Substance Registry System	2-Pentenoic acid, 2-methyl- (3142-72-1)

Safety information for 2-Methyl-2-pentenoic acid

Signal word	Danger
Pictogram(s)	Corrosion Corrosives GHS05
GHS Hazard Statements	H314:Skin corrosion/irritation
Precautionary Statement Codes	P260:Do not breathe dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P330+P331:IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.