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Product Name: |
2-Methylpyrazine |
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Synonyms: |
2-Methylpyrazine ,98%;3-Methylpyrazine;2-Methylpyrazine >=99.0%;2-Methylpyrazine, 99+ % 25GR;2-METHYLPYRAZINE FOR SYNTHESIS;2-Methylpyrazine, 97+%;METHYLPYRAZINE;METHYLPYRAZINE, 2- |
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CAS: |
109-08-0 |
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MF: |
C5H6N2 |
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MW: |
94.11 |
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EINECS: |
203-645-8 |
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Mol File: |
109-08-0.mol |
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Melting point |
−29 °C(lit.) |
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Boiling point |
135 °C761 mm Hg(lit.) |
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density |
1.03 g/mL at 25 °C(lit.) |
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FEMA |
3309 | 2-METHYLPYRAZINE |
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refractive index |
n20/D 1.504(lit.) |
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Fp |
122 °F |
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storage temp. |
Flammables area |
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pka |
1.45(at 27℃) |
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form |
Liquid |
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color |
Clear colorless to slightly yellow |
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Water Solubility |
Fully miscible in water. |
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JECFA Number |
761 |
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BRN |
105778 |
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InChIKey |
CAWHJQAVHZEVTJ-UHFFFAOYSA-N |
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CAS DataBase Reference |
109-08-0(CAS DataBase Reference) |
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NIST Chemistry Reference |
Pyrazine, methyl-(109-08-0) |
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EPA Substance Registry System |
Pyrazine, methyl- (109-08-0) |
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Hazard Codes |
Xn,Xi,F |
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Risk Statements |
10-22-36/37/38 |
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Safety Statements |
26-36-16 |
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RIDADR |
UN 1993 3/PG 3 |
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WGK Germany |
3 |
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RTECS |
UQ3675000 |
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TSCA |
Yes |
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HazardClass |
3 |
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PackingGroup |
III |
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HS Code |
29339990 |
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Chemical Properties |
2-Methylpyrazine has a nutty, cocoa, green, roasted, chocolate, meaty odor. |
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Chemical Properties |
clear colorless to slightly yellow liquid |
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Preparation |
From corresponding carboxylic acid; by catalytic dehydrogenation of 2-methyl-piperazine; by condensation of methylglyoxal with ethylenediamine |
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Aroma threshold values |
Detection: 60 ppb to 100 ppm |
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Taste threshold values |
Taste characteristics at 75 ppm: nutty, brown, musty, roasted and astringent |
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Safety Profile |
Moderately toxic by ingestion and intraperitoneal routes. Mutation data reported. Flammable liquid when exposed to heat, sparks, or flame. Can react with oxidizing materials. To fight fire, use water spray, foam, dry chemical, CO2. When heated to decomposition it emits highly toxic fumes of NOx. |
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Purification Methods |
Purify it via the picrate and distil the free base. The picrate has m133-134o(from EtOH). [Wiggins & Wise J Chem Soc 4780 1956, Beilstein 23 III/IV 911, 23/5 V 386.] |
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Raw materials |
Ethylenediamine-->Methylglyoxal-->2-Methylpiperazine |
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Preparation Products |
Tetramethylpyrazine-->5-Methyl-2-pyrazinecarboxylic acid |
