ynyl
Ynyl is a suffix used in organic chemistry to indicate a substituent derived from an alkyne by removing a hydrogen atom, akin to the way -yl designates alkyl substituents. It appears in the name of alkynyl groups such as ethynyl, where the substituent has a terminal alkyne (–C≡CH). More complex alkynyl substituents, including propargyl (prop-2-yn-1-yl) and other longer alkynyl chains, share this root. IUPAC generally favors the broader term alkynyl for this class, with specific substituents named accordingly (ethynyl, propargyl, etc.).
Physically, ynyl substituents are characterized by an sp-hybridized carbon in the alkyne bond; they are common