2,3-Diethyl-5-methylpyrazine Chemical Properties

Boiling point:

95 °C (20 mmHg)

Density 

0.949 g/mL at 25 °C (lit.)

refractive index 

n20/D 1.498(lit.)

FEMA 

3336 | 2,3-DIETHYL-5-METHYLPYRAZINE

Flash point:

176 °F

storage temp. 

2-8°C

solubility 

Chloroform, Methanol

pka

2?+-.0.10(Predicted)

color 

Clear Colourless

Specific Gravity

0.950.949

Odor

at 0.10 % in dipropylene glycol. musty nut skin earthy roasted hazelnut toasted potato dusty foliage vegetable

Odor Type

musty

biological source

synthetic

Water Solubility 

SLIGHTLY SOLUBLE

JECFA Number

777

LogP

2.16

CAS DataBase Reference

18138-04-0(CAS DataBase Reference)

NIST Chemistry Reference

Pyrazine, 2,3-diethyl-5-methyl-(18138-04-0)

EPA Substance Registry System

Pyrazine, 2,3-diethyl-5-methyl- (18138-04-0)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36/37/39

RIDADR 

NA 1993 / PGIII

WGK Germany 

3

TSCA 

Yes

HazardClass 

3

PackingGroup 

III

HS Code 

29339900

MSDS

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2,3-Diethyl-5-methylpyrazine Usage And Synthesis

Chemical Properties

CLEAR LIGHT YELLOW LIQUID

Chemical Properties

2,3-Diethyl-5-methylpyrazine has a nutty, roasted, vegetable aroma.

Occurrence

Reported to be present in coffee, filberts, potato products, Parmesan cheese, chicken, beef, pork, cocoa, peanuts, popcorn, sesame seed and corn tortillas.

Uses

2,3-Diethyl-5-methylpyrazine is a volatile compound found in food such as almonds and swiss cheese.

Definition

ChEBI: 2,3-Diethyl-5-methylpyrazine is a member of pyrazines.

Preparation

By condensation of 3,4-hexanedione with propylene diamine.

Aroma threshold values

Detection: 0.09 to 1 ppb

Taste threshold values

Taste characteristics at 2.5 ppm: musty, toasted; nutty, potato, cocoa, earthy and dirty.

General Description

2,3-Diethyl-5-methylpyrazine has been identified as a potent odorant in coffee sample and has been evaluated by gas chromatography-olfactometry of decreasing headspace samples.

2,3-Diethyl-5-methylpyrazine(18138-04-0)Related Product Information

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• diethylmethylpyrazine,3,5-diethyl-2-methylpyrazine,3,5-DIETHYL-2-METHYLPYRAZINE,2,6-Diethyl-5-methylpyrazine
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• 2,3-DIETHYL-5-METHYLPYRAZINE-N'-OXIDE
• 2-(1-ACETOXYETHYL)-3-ETHYL-5-METHYLPYRAZINE
• 2,3-DIETHYL-5-METHYLPYRAZINE-N4-OXIDE
• 2,5-DIETHYL-3-METHYLPYRAZINE