C2H6S

C2H6S is the molecular formula that can refer to two distinct structural isomers in organosulfur chemistry: ethanethiol (ethyl mercaptan) and dimethyl sulfide. Ethanethiol has the structure CH3-CH2-SH, while dimethyl sulfide consists of a sulfur atom bound to two methyl groups (CH3-S-CH3). Both compounds share the same formula and a molecular weight of about 62.13 g/mol.

Ethanethiol is a colorless, volatile liquid with a strong, highly recognizable odor typically described as foul or sulfurous. Dimethyl sulfide is also a colorless, volatile liquid but with a milder, more commonplace odor associated with cooked seafood or certain fermented foods. Both substances are flammable and have low odor thresholds, meaning they can be detected by smell at very low concentrations.

Occurrence and uses: Ethanethiol occurs in trace amounts in various natural and industrial contexts and is widely used as an odorant added to natural gas to enable leak detection. Dimethyl sulfide is produced biologically in marine environments and during fermentation; commercially, it is used as a solvent and as a flavor and fragrance ingredient. It also appears as a byproduct in several industrial processes and in some foods and beverages, contributing to characteristic aromas.

Reactivity and safety: Thiols like ethanethiol can oxidize to form disulfides and react with oxidizers, while sulfides like dimethyl sulfide can be oxidized to sulfoxides and sulfones. Both C2H6S isomers are flammable and should be handled with appropriate ventilation and adherence to safety guidelines, as exposure can irritate eyes, skin, or the respiratory system at higher levels.