Physicochemical properties of pyrazine

A six-membered heterocyclic compound containing two nitrogen heteroatoms at positions 1 and 4. Molecular formula C4H4N2. Two nitrogen atoms in 1 and 2 digits are called pyridazine, and 1 and 3 digits are called pyrimidine, both of which are isomers of pyrazines. Colorless crystal. The melting point is 54℃, the boiling point is 115 ~ 116℃(768 mm Hg), and the relative density of the liquid is 1.0311(61/4℃). It has an odor similar to pyridine. Soluble in water, ethanol, ether, etc. Pyrazine is a very weak base. Its aromatics are similar to pyridine, it is very unlikely to undergo electrophilic substitution reactions, and it is more active to nucleophiles. After the hydrogen on the carbon atom is replaced by a methyl group or halogen, the hydrogen on the halogen or methyl group is active.