3-Ethyl-2-hydroxy-2-cyclopenten-1-one

Synonym(s):3-Ethylcyclopentan-1,2-dione

CAS NO.：21835-01-8
Empirical Formula: C7H10O2
Molecular Weight: 126.15
MDL number: MFCD00012391
EINECS: 244-606-5
SAFETY DATA SHEET (SDS)
Update Date: 2025-06-26 21:45:57

3-Ethyl-2-hydroxy-2-cyclopenten-1-one Structural

What is 3-Ethyl-2-hydroxy-2-cyclopenten-1-one?

Chemical properties

3-Ethyl-2-hydroxy-2-cyclopenten-1-one has a caramel-like flavor. This compound is often employed to impart a caramel flavor or coconut notes in food. The compound exhibits flavor-enhancing characteristics.

Preparation

From 5-methyl-3,5-dicarbethoxy-2-cyclopen-ten-2-ol-one and phosphoric acid; by a patented process; also from dimethyl adipate.

Definition

ChEBI: 3-Ethyl-2-hydroxycyclopent-2-en-1-one is a cyclic ketone.

Aroma threshold values

Aroma characteristics at 0.5%: sweet, brown, caramellic, maple, brown sugar, rum, whiskey, furanone.

Taste threshold values

A threshold value of 5 ppm, similar to the 3-methyl analog, has been determined by comparative sensory evaluation. Taste characteristics at 12 ppm: sweet, jamy, fruity, brown, toasted, maple, nutty

General Description

3-Ethyl-2-hydroxy-2-cyclopenten-1-one is formed by thermal degradation of ascorbic acid. It is an aroma compound formed from the reactions of L-ascorbic acid with L-threonine/L-serine at different pH values.

Properties of 3-Ethyl-2-hydroxy-2-cyclopenten-1-one

Melting point:	39.0 to 43.0 °C
Boiling point:	75°C/0.3mmHg(lit.)
Density	1.066 at 25 °C
refractive index	n20/D 1.476
FEMA	3152 \| 3-ETHYL-2-HYDROXY-2-CYCLOPENTEN-1-ONE
Flash point:	225 °F
storage temp.	2-8°C
solubility	soluble in Methanol,Ether
form	powder to crystal
pka	9.17±0.20(Predicted)
color	White to Orange to Green
Odor	at 1.00 % in propylene glycol. sweet caramel maple fenugreek
JECFA Number	419
CAS DataBase Reference	21835-01-8(CAS DataBase Reference)
NIST Chemistry Reference	2-Cyclopenten-1-one, 3-ethyl-2-hydroxy-(21835-01-8)
EPA Substance Registry System	2-Cyclopenten-1-one, 3-ethyl-2-hydroxy- (21835-01-8)

Safety information for 3-Ethyl-2-hydroxy-2-cyclopenten-1-one

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H317:Sensitisation, Skin
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P272:Contaminated work clothing should not be allowed out of the workplace. P280:Wear protective gloves/protective clothing/eye protection/face protection. P333+P313:IF SKIN irritation or rash occurs: Get medical advice/attention. P501:Dispose of contents/container to..…