propyyli

Propyyli is a term that appears in some non-English chemical literature to denote the propyl substituent derived from propane by removing one hydrogen. In English-language chemistry, the standard term is propyl. Propyyli is not part of contemporary English nomenclature, but may be encountered in older texts or in translations where local orthography preserves a form closer to the original language.

The propyl group is an alkyl substituent with three carbon atoms and the general formula C3H7. There are two common structural isomers: the n-propyl group (propyl attached at the terminal carbon, also called propan-1-yl) and the isopropyl group (prop-2-yl or isopropyl). When bound to a parent molecule, the propyl group is represented as -C3H7.

In IUPAC nomenclature, the substituent is named propyl, with systematic forms propan-1-yl and propan-2-yl used to indicate attachment position on the parent structure. English usage often employs the traditional names n-propyl and isopropyl, particularly in older or practical contexts (for example, n-propyl alcohol and isopropyl alcohol, the latter more formally propan-2-ol).

Propyyli, when encountered, thus generally refers to the same concept as propyl but reflects spelling variations found in non-English sources. The concept also underpins a wide range of compounds, including propyl esters, propyl ethers, and various propyl-substituted pharmaceuticals and polymers.

See also: Propyl group, Propane, Alkyl group, Propan-1-yl, Propan-2-yl.