organic compounds
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The title compound, C16H22Br2O, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The molecule is built up from fused six- and seven-membered rings and an additional three-membered ring from the reaction of himachalene with dibromocarbene. The six-membered ring has an envelope conformation, with the C atom belonging to the three-membered ring forming the flap, whereas the seven-membered ring displays a screw-boat conformation; the dihedral angle between the rings (all atoms) is 60.92 (16)°.
organic compounds
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The fused five- and six-membered rings in the title molecule, C10H9N3O2, are essentially coplanar, the largest deviation from the mean plane being 0.012 (1) Å for the C atom linked to the nitro group. The fused-ring system makes a dihedral angle of 11.34 (6)° with the nitro group, leading to a syn-periplanar conformation. The plane through the atoms forming the allyl group is nearly perpendicular to the indazole fused-ring system, as indicated by the dihedral angle of 73.3 (5)°. In the crystal, each molecule is linked to its symmetry equivalent about the center of inversion by pairs of non-classical C—HO hydrogen bonds, forming an extended tape motif parallel to the (-12-1) plane.
organic compounds
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In the molecule of the title compound, C15H12ClNO3, the chlorobenzamide and benzoate units are almost co-planar, with a dihedral angle between the six-membered rings of 2.99 (10)°. An intramolecular N—HO hydrogen bond occurs. In the crystal, each molecule is linked to a symmetry-equivalent counterpart across a twofold rotation axis by weak C—HO and C—HCl hydrogen bonds, forming dimers. The packing is stabilized through weak π–π stacking along the b-axis direction, leading to π-stacked columns of inversion-related molecules, with an interplanar distance of 3.46 (2) Å and a centroid–centroid vector of 3.897 (2) Å.