S. Sundaramoorthy

(Z)-2-[2-(4-Methyl­benzyl­idene)hydrazin­yl]pyridine

Molecules of the title compound, C13H13N3, are essentially planar (r.m.s. deviation for all non-H atoms = 0.054 Å). The dihedral angle between the two aromatic rings is 6.33 (5)°. In the crystal, pairs of centrosymmetrically related molecules are linked through N—H⋯N hydrogen bonds, forming N—H⋯N dimers with graph-set motif R22(8).

Ethyl 4-hy-droxy-2,6-diphenyl-1-[2-(piperidin-1-yl)acet-yl]-1,2,5,6-tetra-hydro-pyridine-3-carboxyl-ate.

In the title compound, C27H32N2O4, the piperidine and tetrahydropyridine rings adopt chair and half-chair conformations, respectively. The dihedral angle between the two phenyl rings is 32.9 (1)°. The molecular structure is stabilized by a strong intramolecular O—H⋯O hydrogen bond, generating an S(6) motif. In the crystal, intermolecular C—H⋯O interactions form a ribbon-like structure along the a axis.

Ethyl 4-hy­droxy-2,6-diphenyl-1-(2-thio­morpholino­acet­yl)-1,2,5,6-tetra­hydro­pyridine-3-carboxyl­ate

In the title compound, C26H30N2O4S, the thiomorpholine ring adopts a chair conformation whereas the tetrahydropyridine ring is in a half-chair conformation. The dihedral angle between the two phenyl rings is 33.3 (2)°. A strong intramolecular O—H⋯O hydrogen bond generates an S(6) motif. In the crystal, molecules are linked by intermolecular C—H⋯O hydrogen bonds, generating a ribbon-like structure propagating along the a axis.

Ethyl 1-benzoyl-4-hy­droxy-2,6-diphenyl-1,2,5,6-tetra­hydro­pyridine-3-carboxyl­ate

In the title compound, C27H25NO4, the tetrahydropyridine ring adopts a half-chair conformation. The three phenyl rings form dihedral angles of 66.33 (7), 87.36 (8) and 36.90 (7)° with the least-squares plane through the tetrahydropyridine ring. The molecular conformation is stabilized by an intramolecular O—H⋯O hydrogen bond, generating an S(6) motif.

Ethyl 4-(3-bromo­phen­yl)-6-methyl-2-oxo-1,2,3,4-tetra­hydro­pyrimidine-5-carboxyl­ate

In the title compound, C14H15BrN2O3, the dihydropyrimidinone ring adopts a boat conformation. In the crystal, adjacent molecules are linked through N—H⋯O hydrogen bonds forming an R22(8) ring motif and generating a zigzag chain extending in [010].

3-(4-Methoxy­phen­yl)-6-(phenyl­sulfon­yl)perhydro-1,3-thiazolo[3′,4′:1,2]pyrrolo[4,5-c]pyrrole

In the title compound, C21H24N2O3S2, the three five-membered rings adopt envelope conformations. The dihedral angle between the two aromatic rings is 68.4 (1)°. C—H⋯O interactions link the molecules into a chain and the chains are cross-linked via C—H⋯π interactions involving the methoxyphenyl ring.

Ethyl 1-[2-(1H-benzotriazol-1-yl)acet-yl]-4-hy-droxy-2,6-diphenyl-1,2,5,6-tetra-hydro-pyridine-3-carboxyl-ate.

In the title compound, C28H26N4O4, the tetrahydropyridine ring adopts a boat conformation. The two phenyl rings form dihedral angles of 88.64 (8) and 59.28 (10)° with the best plane through the tetrahydropyridine ring. The dihedral angle between the two phenyl rings is 82.55 (10)°. The benzotriazole ring system is essentially planar, with a maximum deviation of 0.009 (1) Å from the least-squares plane. The molecular conformation is stabilized by an intramolecular O—H⋯O hydrogen bond, generating an S(6) motif.

r-2,c-6-Bis(2-methoxy­phen­yl)-t-3,t-5-dimethyl­piperidin-4-one acetic acid solvate

In the title compound, C21H25NO3·C2H4O2, the piperidone ring adopts a chair conformation. The two methoxy groups are nearly coplanar with the aromatic rings to which they are attached. The dihedral angle between the two aromatic rings is 60.9 (2)°. There are two short intramolecular N—H⋯O contacts. The crystal packing is stabilized by intermolecular O—H⋯N and C—H⋯O interactions.

1-(2-Azidoacetyl)-3-methyl-2,6-diphenylpiperidin-4-one

In the title compound, C20H20N4O2, the piperidine ring adopts a distorted boat conformation. The two phenyl rings form dihedral angles of 82.87 (1) and 84.40 (1)° with respect to the piperidine ring. The crystal packing is stabilized by intermolecular C—H⋯O and C—H⋯N interactions.

1-(2-Bromo­acet­yl)-3-methyl-2,6-diphenyl­piperidin-4-one

In the title compound, C20H20BrNO2, the piperidone ring adopts a boat conformation. The phenyl rings are oriented at dihedral angles of 97.8 (2) and 96.0 (1)° with respect to the best plane through the piperidine ring. The dihedral angle between the two phenyl rings is 49.7 (1)°. In the crystal, bifurcated C—H⋯O hydrogen bonds form a R 2 1(7) ring motif, linking the molecules into centrosymmetric dimers.