🥼organic chemistry review

Mercapto group

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

A mercapto group consists of a sulfur atom bonded to a hydrogen atom (-SH), functioning as a substituent or side chain in organic compounds. It is the sulfur analogue of the hydroxyl group (-OH) found in alcohols.