Pyrazine（CAS#290-37-9）
| Risk Codes | R36/37/38 – Irritating to eyes, respiratory system and skin. R11 – Highly Flammable |
| Safety Description | S26 – In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 – Wear suitable protective clothing. S16 – Keep away from sources of ignition. |
| UN IDs | UN 1325 4.1/PG 2 |
| WGK Germany | 3 |
| RTECS | UQ2015000 |
| TSCA | T |
| HS Code | 29339990 |
| Hazard Class | 4.1 |
| Packing Group | III |
Introduction
Heterocyclic compounds containing two heteronitrogen atoms at positions 1 and 4. It is an isomer to pyrimidine and pyridazine. Soluble in water, alcohol and ether. It has weak aromaticity, similar to pyridine. It is not easy to undergo electrophilic substitution reactions, but it is easy to undergo substitution reactions with nucleophiles.
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