3-Methyl-2-cyclopentenone
Synonym(s):3-Methyl-2-cyclopentenone
- CAS NO.：2758-18-1
- Empirical Formula: C6H8O
- Molecular Weight: 96.13
- MDL number: MFCD00001403
- EINECS: 220-421-5
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-28 05:07:50
What is 3-Methyl-2-cyclopentenone?
Description
May be prepared by dehydrohalogenation of 2-chloro-l-methylcyclopentan-3-one.
Chemical properties
clear light yellow to yellow-brownish liquid
Chemical properties
1-Methyl-1-cyclopenten-3-one has a sweet-floral, warm-spicy and diffusive yet quite tenacious odor.
Occurrence
Reported found in roasted onion, cooked pork, black tea, soybean and dried bonito
The Uses of 3-Methyl-2-cyclopentenone
It is an important raw material and intermediate used in Organic Synthesis, Pharmaceuticals, Agrochemicals.
The Uses of 3-Methyl-2-cyclopentenone
3-Methyl-2-cyclopentenone was used in the synthesis of 2-hydroxy-3-methyl-2-cyclopentenone.
Preparation
By dehydrohalogenation of 2-chloro-1-methyl-cyclopentan-3-one.
Definition
ChEBI: 3-Methyl-2-cyclopenten-1-one is a cyclic ketone.
Synthesis Reference(s)
Journal of the American Chemical Society, 101, p. 494, 1979 DOI: 10.1021/ja00496a044
The Journal of Organic Chemistry, 55, p. 371, 1990
General Description
3-Methyl-2-cyclopenten-1-one is a component of smoke flavoring.
Properties of 3-Methyl-2-cyclopentenone
| Melting point: | 3-5 °C (lit.) |
| Boiling point: | 74 °C/15 mmHg (lit.) |
| Density | 0.980 g/mL at 20 °C
0.971 g/mL at 25 °C (lit.) |
| refractive index | n |
| FEMA | 3435 | 1-METHYL-1-CYCLOPENTEN-3-ONE |
| Flash point: | 150 °F |
| storage temp. | 2-8°C |
| solubility | Soluble in DMSO |
| form | Liquid |
| color | Clear light yellow to yellow-brown |
| Odor | at 1.00 % in dipropylene glycol. sweet fruity fatty |
| PH | 4.9 (10g/l, H2O, 20℃) |
| Water Solubility | miscible |
| JECFA Number | 1105 |
| BRN | 1280476 |
| CAS DataBase Reference | 2758-18-1(CAS DataBase Reference) |
| NIST Chemistry Reference | 2-Cyclopenten-1-one, 3-methyl-(2758-18-1) |
| EPA Substance Registry System | 3-Methyl-2-cyclopenten-1-one (2758-18-1) |
Safety information for 3-Methyl-2-cyclopentenone
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H227:Flammable liquids |
| Precautionary Statement Codes |
P403+P235:Store in a well-ventilated place. Keep cool. |
Computed Descriptors for 3-Methyl-2-cyclopentenone
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