Pyrazine
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| Pyrazine | |
|---|---|
| |
| IUPAC name | Pyrazine |
| Other names | 1,4-Diazabenzene, p-Diazine, 1,4-Diazine, Paradiazine, Piazine, UN 1325 |
| Identifiers | |
| CAS number | |
| PubChem | |
| EINECS number | |
| ChEBI | |
| SMILES | C1=CN=CC=N1 |
| InChI | InChI=1/C4H4N2/c1-2-6-4-3-5-1/h1-4H |
| Properties | |
| Molecular formula | C4H4N2 |
| Molar mass | 80.09 g/mol |
| Appearance | White crystals |
| Density | 1.031 g/cm3 |
| Melting point |
52 ºC |
| Boiling point |
115 ºC |
| Solubility in water | Soluble |
| Hazards | |
| NFPA 704 |
|
| R-phrases | R11, R36/37/38 |
| S-phrases | S16, S26, S36 |
| Flash point | 55 ºC c.c. |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | |
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Overview
Pyrazine is a heterocyclic aromatic organic compound.
Pyrazine is a symmetrical molecule with point group D2h. It is found in folic acid in the form of pterin. Derivatives like Phenazine are well known for their antitumor, antibiotic and diuretic activity. Pyrazine is less basic in nature than pyridine, pyridazine and pyrimidine. Tetramethylpyrazine is reported to scavenge superoxide anion and decrease nitric oxide production in human polymorphonuclear leukocytes[1]. It is also found on the cigarette additives list.
Synthesis
Many methods exist for the organic synthesis of pyrazine and derivatives and some of them very old.
In the Staedel-Rugheimer pyrazine synthesis (1876) 2-chloroacetophenone is reacted with ammonia to the amino ketone, then condensed and then oxidized to a pyrazine [1] A variation is the Gutknecht Pyrazine Synthesis (1879) also based on this selfcondensation but differing in the way the alpha-ketoamine is synthesised (the chlorine compound in the above method is a lachrymatory agent) [1] [1]
The Gastaldi synthesis (1921) is another variation [1] [1]:
See also
- Pyrimidine, an analog with the second nitrogen atom in position 3.
- Pyridazine, an analog with the second nitrogen atom in position 2.
- Pyridine, an analog with only one nitrogen atom.
- Benzene, an analog without the nitrogen atoms.
- Simple aromatic rings
- Methoxypyrazines
External links
References
de:Pyrazin
eo:Piracino
ja:ピラジン
sv:Pyrazin
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
