ChemicalBook > Product Catalog > Flavors and fragrances > Synthetic fragrances > Pyrazine spices > 2,5-Dimethyl pyrazine
2,5-Dimethyl pyrazine Chemical Properties
- Melting point:15°C
- Boiling point:155 °C(lit.)
- Density 0.99 g/mL at 25 °C(lit.)
- FEMA 3272 | 2,5-DIMETHYLPYRAZINE
- refractive index n
- Flash point:147 °F
- storage temp. Store below +30°C.
- form Liquid
- Specific Gravity0.990
- color Clear colorless to pale yellow
- PH7 (H2O)
- Sensitive Hygroscopic
- JECFA Number766
- BRN 107052
- CAS DataBase Reference123-32-0(CAS DataBase Reference)
- NIST Chemistry ReferencePyrazine, 2,5-dimethyl-(123-32-0)
- EPA Substance Registry SystemPyrazine, 2,5-dimethyl- (123-32-0)
2,5-Dimethyl pyrazine Usage And Synthesis
- Chemical Propertiesclear colorless to pale yellow liquid
- Chemical Properties2,5-Dimethylpyrazine has a characteristic odor of earthy, potato-like odor.
- OccurrenceReported to be present in bakery products, roasted barley, cocoa products, roasted coffee, dairy products, pork, peanuts, pecans, filberts, popcorn, potato products, rum and whiskey, soy products; a volatile component in roasted filberts and in potato chips; reportedly identified in the fat of cooked beef; also reported found in toasted off-flavors. Also reported in cheeses, butter, boiled eggs, grilled beef, tea, barley, oats, oatmeal, soybeans, heated beans, kohlrabi, shrimp and mushrooms. Also reported found in coffee, potato chips and shrimp
- Uses2,5-Dimethyl pyrazine is used for blending food, nuts and beverage flavors.
- PreparationBy 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.
- Aroma threshold valuesDetection: 80 ppb to 1.8 ppm
- Taste threshold valuesTaste characteristics at 7.5 ppm: musty, potato, cocoa and nutty with a fatty and oily nuance
- Safety ProfileModerately toxic by ingestion and intraperitoneal routes. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx
- Purification MethodsPurify 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.]
2,5-Dimethyl pyrazine Preparation Products And Raw materials
- Trimethyl-pyrazine DIMETHYL DIHYDROCYCLOPENTAPYRAZINE 2,3-Diethyl-5-methylpyrazine Glipizide 2,5-Dimethyl pyrazine Dacthal Pyrazinamide N,N-Dimethylformamide Dimethyl phthalate Dimethyl sulfate ETHANE DIMETHYLPYRAZINE 2,6-Dimethylpyrazine 2-Methylpyrazine 2,5-Dibromopyrazine DMC Dimethyl ether Dimethyl fumarate
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- Jan 7，2020