HPLC of Formula: 7661-33-8. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 1-(4-Chlorophenyl)pyrrolidin-2-one, is researched, Molecular C10H10ClNO, CAS is 7661-33-8, about Lactams. VIII. Conformation of N-aryl lactams. Author is Manhas, Maghar S.; Jeng, Stella J.; Bose, Ajay K..
N-Aryl β-lactams were characterized by strong uv maximum at about 250 mμ. Some N-aryl γ-lactams also show similar absorption maximum but heavily substituted γ-lactams or N-phenyl δ-lactam display only low absorption in this region. A study of uv and N.M.R. spectra indicates that in N-aryl β-lactams, the heterocyclic ring and the three valences of N are planar and the N-aryl ring lies in the plane of the β-lactam. This planarity as well as the strong uv absorption are the result of an extended conjugation between the aryl ring and the amide function. Ortho substitution on the aryl ring causes a slight departure from this planarity and reduces the intensity of the uv absorption. In case of N-aryl γ-lactams, ortho substitution on the aryl ring causes enough departure from planarity to eliminate altogether the absorption maximum near 250 mμ. 22 references.
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