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The title compound, C16H15NO3S, was prepared by base-catalyzed reaction of 3,4,5-trimethoxy­benzaldehyde with thio­phene-3-acetonitrile. The olefinic bond has Z geometry and thien­yl ring flip disorder is observed.

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The title compound, C11H8Cl2N2S, was prepared from the condensation reaction of thio­phene-3-carbaldehyde with 2,5-dichloro­phenyl­hydrazine. The azomethine C=N bond has E geometry. No thien­yl ring flip was observed.

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Crystals of the title compound, which is also commonly known as 6-O-acetyl­codeine, C20H23NO4, were obtained by acetyl­ation of codeine and subsequent crystallization of the product from eth­yl acetate. The atoms of the benzene ring are nearly coplanar, whereas the five-memberedring is distorted. The ethanamine ring has a typical chair form conformation, while the cyclohexene ring is in a twisted boat form.

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The title compound {systematic name: (1R,2R,5R)-(+)-2-hydr­oxy-2,6,6-trimethyl-3-[(3-pyrid­yl)methyl­imino]­bicyclo[3.1.1]­heptane}, C16H22N2O, was obtained by the condensation reaction of (1R,2R,5R)-(+)-2α-hydroxy­pinan-3-one with 3-(amino­meth­yl)pyridine in the presence of boron trifluoride. The compound was obtained as an enantiomerically pure isomer, and has the 1R,2R,5R configuration. In the crystal structure, mol­ecules are linked together by inter­molecular O—H...N hydrogen bonds between the hydr­oxy group of the pinanone group and the N atom of the pyridine ring, forming mol­ecular chains.

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The dihedral angle between the benzene rings in the title compound, C13H6Cl6O, is 49.06 (8)°. The molecule has crystallographic twofold rotation symmetry.

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The dihedral angle between the benzene rings in the title compound, C12H5Cl5, is 81.5 (2)°.

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The title compound, C14H14N2O3, was prepared by the base-catalyzed condensation reaction of 3-nitro­benzaldehyde with 1-aza­bicyclo­[2.2.2]octan-3-one. The 3-nitro­phenyl ring is twisted by 27.29 (19)° with respect to the plane of the C=C double bond connected to the aza­bicyclic ring. The mol­ecule adopts the Z configuration.

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The title compound, C18H17NOS2, was prepared by the base-catalyzed Aldol condensation of tropinone with thio­phene-3-carboxaldehyde. It crystallizes with the molecule on a mirror plane. Both double bonds linking the tropinone and thio­phene rings adopt the E configuration, with the thienyl-ring flip and the H atoms of the N-methyl group disordered.
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