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Product Name: |
2,5-Dimethyl pyrazine |
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Synonyms: |
tomfor;2,5-Dimethylpyrazine 98+%;2,5-Dimethylprazin;2,5-Dimethylpyrazine (contains 2,6-isomer);2,5-DIMETHYL PYRAZINE, NATURAL;2,5-Dimethylpyrazine,99%;2,5-Dimethylpyrazine, Research grade;2,5-Dimethyl pyrazine >=99.0% |
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CAS: |
123-32-0 |
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MF: |
C6H8N2 |
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MW: |
108.14 |
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EINECS: |
204-618-3 |
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Product Categories: |
Pyrazine;Heterocyclic Compounds;Acipimox;Mono- & Polyalkylpyrazines;pyrazine Flavor;Building Blocks;Heterocyclic Building Blocks;Alphabetical Listings;C-D;Flavors and Fragrances;Pyrazine compounds;Pyrazines |
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Mol File: |
123-32-0.mol |
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Melting point |
15°C |
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Boiling point |
155 °C(lit.) |
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density |
0.99 g/mL at 25 °C(lit.) |
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FEMA |
3272 | 2,5-DIMETHYLPYRAZINE |
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refractive index |
n20/D 1.502(lit.) |
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Fp |
147 °F |
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storage temp. |
Store below +30°C. |
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form |
Liquid |
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pka |
2.21±0.10(Predicted) |
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Specific Gravity |
0.990 |
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color |
Clear colorless to pale yellow |
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PH |
7 (H2O) |
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Sensitive |
Hygroscopic |
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JECFA Number |
766 |
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BRN |
107052 |
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CAS DataBase Reference |
123-32-0(CAS DataBase Reference) |
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NIST Chemistry Reference |
Pyrazine, 2,5-dimethyl-(123-32-0) |
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EPA Substance Registry System |
Pyrazine, 2,5-dimethyl- (123-32-0) |
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Hazard Codes |
Xn,Xi |
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Risk Statements |
22-36/37/38-R22 |
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Safety Statements |
26-36 |
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RIDADR |
NA 1993 / PGIII |
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WGK Germany |
3 |
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RTECS |
UQ2800000 |
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Hazard Note |
Irritant |
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TSCA |
Yes |
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HS Code |
29339990 |
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Chemical Properties |
clear colorless to pale yellow liquid |
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Chemical Properties |
2,5-Dimethylpyrazine has a characteristic odor of earthy, potato-like odor. |
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Uses |
2,5-Dimethyl pyrazine is used for blending food, nuts and beverage flavors. |
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Preparation |
By the interaction of acrolein and ammonia when heated in glycerol in the presence of ammonium salts; by self-condensation of aminoacetone, followed by oxidation with mercury chloride. |
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Aroma threshold values |
Detection: 80 ppb to 1.8 ppm |
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Taste threshold values |
Taste characteristics at 7.5 ppm: musty, potato, cocoa and nutty with a fatty and oily nuance |
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Safety Profile |
Moderately toxic by ingestion and intraperitoneal routes. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx |
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Purification Methods |
Purify it via its picrate (m 150o) which is decomposed with a base (e,g, KOH) and distilled. [Wiggins and Wise J Chem Soc 4780 1956]. [Beilstein 23/5 V 403.] |
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Raw materials |
Acrolein |
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Preparation Products |
trans-2,5-Dimethylpiperazine-->2,6-Dimethylpyrazine |
