Pyrazine

Pyrazine
Names
	Preferred IUPAC name Pyrazine
	Other names 1,4-Diazabenzene, p-Diazine, 1,4-Diazine, Paradiazine, Piazine, UN 1325
Identifiers
CAS Number	290-37-9 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30953 ;
ChEMBL	ChEMBL15797 ;
ChemSpider	8904 ;
ECHA InfoCard	100.005.480
EC Number	206-027-6;
PubChem CID	9261;
UNII	2JKE371789 ;
CompTox Dashboard (EPA)	DTXSID8049410 ;
	InChI InChI=1S/C4H4N2/c1-2-6-4-3-5-1/h1-4H Key: KYQCOXFCLRTKLS-UHFFFAOYSA-N ; InChI=1/C4H4N2/c1-2-6-4-3-5-1/h1-4H;
	SMILES c1cnccn1;
Properties
Chemical formula	C4H4N2
Molar mass	80.09 g/mol
Appearance	White crystals
Density	1.031 g/cm3
Melting point	52 °C (126 °F; 325 K)
Boiling point	115 °C (239 °F; 388 K)
Solubility in water	Soluble
Acidity (pKa)	0.37 (protonated pyrazine)
Magnetic susceptibility (χ)	-37.6·10−6 cm3/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H228, H315, H319, H335
Precautionary statements	P210, P261, P305+P351+P338
NFPA 704 (fire diamond)	2 2 0
Flash point	55 °C (131 °F; 328 K) c.c.
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Pyrazine is a heterocyclic aromatic organic compound with the chemical formula C₄H₄N₂. It is a symmetrical molecule with point group D_2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. It is a "deliquescent crystal or wax-like solid with a pungent, sweet, corn-like, nutty odour".

Pyrazine and a variety of alkylpyrazines are flavor and aroma compounds found in baked and roasted goods. Tetramethylpyrazine (also known as ligustrazine) is reported to scavenge superoxide anion and decrease nitric oxide production in human Granulocytes.

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