3-methylcyclopent-2-en-1-one Chemical Properties

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.)

FEMA 

3435 | 1-METHYL-1-CYCLOPENTEN-3-ONE

refractive index 

n20/D 1.488(lit.)

Flash point:

150 °F

storage temp. 

2-8°C

solubility 

Soluble in DMSO

form 

Liquid

color 

Clear light yellow to yellow-brown

PH

4.9 (10g/l, H2O, 20℃)

Odor

at 1.00 % in dipropylene glycol. sweet fruity fatty

Odor Type

fruity

Water Solubility 

miscible

JECFA Number

1105

BRN 

1280476

LogP

0.54

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

Risk Statements 

36/38

Safety Statements 

24/25

RIDADR 

1224

WGK Germany 

3

TSCA 

Yes

PackingGroup 

III

HS Code 

29142900

MSDS

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3-methylcyclopent-2-en-1-one Usage And Synthesis

Description

May be prepared by dehydrohalogenation of 2-chloro-l-methylcyclopentan-3-one.

Chemical Properties

1-Methyl-1-cyclopenten-3-one has a sweet-floral, warm-spicy and diffusive yet quite tenacious odor.

Chemical Properties

clear light yellow to yellow-brownish liquid

Occurrence

Reported found in roasted onion, cooked pork, black tea, soybean and dried bonito

Uses

It is an important raw material and intermediate used in Organic Synthesis, Pharmaceuticals, Agrochemicals.

Uses

3-Methyl-2-cyclopentenone was used in the synthesis of 2-hydroxy-3-methyl-2-cyclopentenone.

Definition

ChEBI: 3-Methyl-2-cyclopenten-1-one is a cyclic ketone.

Preparation

By dehydrohalogenation of 2-chloro-1-methyl-cyclopentan-3-one.

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.

3-methylcyclopent-2-en-1-one(2758-18-1)Related Product Information

• Acetonitrile
• Mesotrione
• Kresoxim-methyl
• Methanol
• Methyl acetate
• Paraquat dichloride
• Methylparaben
• N-Methyl-2-pyrrolidone
• 2-Cyclopenten-1-one
• 4-Methyl-2-pentanone
• Methyl acrylate
• Basic Violet 1
• Methyl
• PIPERONYL METHYL KETONE
• METHYL-2-PYRROLIDONE
• Methyl bromide
• 2,3,4,5-TETRAMETHYL-2-CYCLOPENTENONE
• Pyrethrins