Pyrrolidine

Pyrrolidine is a saturated five-membered ring amine with formula C₄H₉N, containing four carbon atoms and one nitrogen atom.

Pyrrolidine ring: A five-membered saturated ring containing four carbon atoms and one nitrogen atom. This ring is pyrrolidine’s defining structural unit.
Amine: An organic compound derived from ammonia by replacing one or more hydrogen atoms with carbon groups. Pyrrolidine is a cyclic amine.
Pyrrolidine alkaloid: An alkaloid whose structure contains a pyrrolidine ring. Many natural products use pyrrolidine as a compact nitrogen-containing ring.
Pyrrole: An aromatic five-membered nitrogen-containing ring with formula C₄H₅N. Pyrrole has the same ring size but is unsaturated and aromatic.
Pyrrolidine synthesis: Methods for preparing pyrrolidine from acyclic precursors or by reducing related compounds. Synthesis routes build or reduce the ring to obtain pyrrolidine.
Secondary amine: An amine whose nitrogen is bonded to two carbon groups and one hydrogen atom. Pyrrolidine’s ring nitrogen is a secondary amine.
Nucleophile: An electron-pair donor that forms a bond to an electron-poor atom. Pyrrolidine’s nitrogen can attack electrophilic centers.
Proline: A proteinogenic amino acid whose side chain forms a five-membered ring with its amino nitrogen. Proline embeds a pyrrolidine-like ring in proteins.
Piperidine: A saturated six-membered ring amine with formula C₅H₁₁N. Piperidine differs by one ring carbon and a larger ring.
Pyrrolidine hydrochloride: The hydrochloride salt formed when pyrrolidine is protonated by hydrochloric acid. This crystalline salt is a practical form for handling and characterizing the amine.

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