mercapto group

A mercapto group, also known as a thiol group, is a functional group in organic chemistry characterized by a sulfur atom bonded to a hydrogen atom (-SH). Thiols are the sulfur analogs of alcohols, where sulfur replaces the oxygen atom.1234

Key characteristics of thiols include:
* Odor: Many thiols have strong, often unpleasant, odors, similar to skunks or rotten eggs, and can be detected at very low concentrations.13
* Reactivity: They exhibit reactions similar to alcohols but differ significantly in oxidation. Mild oxidation produces disulfides, while stronger oxidation yields sulfonic acids.1
* Nomenclature: Thiols are typically named by adding the suffix "-thiol" to the corresponding hydrocarbon name (e.g., butanethiol). The -SH group can also be referred to as a mercapto group, used as a prefix (e.g., mercaptoacetic acid).134

Thiols are found in nature, such as in amino acids like cysteine, and have various applications, including as warning odorants in natural gas and in materials science.34