2-Piperidinone (2-piperidone or δ-valerolactam) is an organic compound with the formula (CH2)4CONH.

Valerolactam is formed by dehydrogenation of 5-amino-1-pentanol, catalyzed by rhodium and ruthenium complexes, [3][4] The compound, a colorless solid, is classified as a lactam.

It is the monomer of nylon 5, a polyamide: This article about a heterocyclic compound is a stub.

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