Chemical Name Pyrrolidine Synonyms Tetrahydro pyrrole, Azolidine, Tetrahydropyrrole CAS Number 123-75-1 Molecular Formula C₄H₉N Molecular Weight 71.12 gmol Appearance Clear, colorless to pale yellow liquid Odor Strong, ammonia-like Boiling Point 87–89°C (189–192°F) Melting Point -60°C (-76°F) Density 0.86 gcm³ at 20°C Pharmaceuticals Intermediate in synthesizing antibiotics, antivirals, and bioactive molecules. Organic Synthesis Building block for heterocyclic compounds (e.g., pyrrolidine derivatives). Chemical Research Solvent and catalyst in asymmetric synthesis and ring-opening reactions. Agrochemicals Precursor for pesticides and herbicides. Polymer Industry Crosslinking agent and monomer for specialty polymers. Catalysis Ligand in transition-metal-catalyzed reactions