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In the title compound, the 1,2,3,4-tetra­hydro­pyridine ring of the quinoline moiety adopts a half-chair conformation while the pyrrolidine ring has an envelope conformation. In the crystal, mol­ecules are linked by N—H...O and C—H...O hydrogen bonds, forming sheets lying parallel to (10\overline{1}), which are linked via C—H...F hydrogen bonds and C—H...π inter­actions, forming a three-dimensional structure.

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In the title compound, C10H9NO3, the dihedral angle between the benzene and pyrrolidine rings is 53.9 (1)°. In the crystal, mol­ecules are linked through strong O—H...O hydrogen bonds into zigzag C(8) chains running along [010]. The chains are linked by C—H...π inter­actions forming sheets lying parallel to (100).

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In the title compound, C13H14N2O2, the C5 ring has an envelope conformation with the C atom adjacent to the quaternary C being the flap. The five atoms comprising the imidazolidine-2,4-dione ring are almost planar (r.m.s. deviation = 0.004 Å). The dihedral angle between the five-membered rings is 89.66 (10)°. In the crystal, inversion-related mol­ecules are connected via {...HNCO}2 synthons. These are linked into a helical supra­molecular chain along [010] by C—H...O inter­actions.

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In the title compound, C16H22N2O, the azepan-2-one ring adopts a chair conformation, while the 1,2,3,4-tetra­hydro­pyridine ring adopts a half-chair conformation. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, forming supra­molecular chains propagated along [10-1], with weak C—H...O inter­actions occurring between the chains.

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In the title compound, C15H18N2O2S, the 2,3-di­hydro-1-benzo­thio­pyran ring adopts a sofa conformation and the hydantoin ring is twisted with respect to the benzene ring at 78.73 (17)°. In the crystal, pairs of N—H...O hydrogen bonds link the mol­ecules into inversion dimers.
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