1OH

1OH is not a single standardized term; it can refer to different concepts depending on context. In chemistry, it is often used informally to indicate a hydroxyl group attached at the first carbon of a carbon framework, or to denote a molecule class that contains a single hydroxyl group, i.e., a monohydric alcohol.

In IUPAC nomenclature, the presence of a hydroxyl group at carbon 1 is reflected by the suffix -ol and the parent chain is named accordingly. For example, ethan-1-ol corresponds to ethanol, and butan-1-ol corresponds to 1-butanol. In general, the locant 1 indicates the position of the hydroxyl substituent on the parent hydrocarbon.

Outside strict chemical nomenclature, "1OH" may appear as an informal label in databases, experimental notes, or software representing a single hydroxyl group at a terminus or as shorthand for a monohydric alcohol. The exact meaning should be inferred from the surrounding data or documentation.

Hydroxyl groups influence several properties, including polarity, hydrogen bonding, solubility, and reactivity. In polymer and materials science, the number and position of OH groups can affect viscosity, boiling point, and cross-linking behavior, shaping both processing and performance characteristics of a substance.

See also: hydroxyl group, alcohol, hydroxy- prefix, ethan-1-ol, butan-1-ol.