Safety
Carbon diselenide has high vapor pressure. It is toxic and presents an inhalation hazard. It may be dangerous due to its easy membrane transport. It decomposes slowly in storage (about 1% per month at –30 °C). When obtained commercially, its cost is high.
Mixed with air, CSe2 releases an extremely offensive odor. Its smell forced an evacuation of a nearby village when it was first synthetized in 1936. The stench can be neutralized by oxidizing with bleach. Because of the odor, synthetic pathways have been developed to avoid its use.
Read more about this topic: Carbon Diselenide
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