Project description:In the title compound, C(16)H(18)NO(2) (+)·C(7)H(7)O(3)S(-)·H(2)O, the dihedral angle between the pyridyl and benzene rings of the pyridinium cation is 0.2 (1)°. The benzene ring of the tosyl-ate anion makes a dihedral angle of 4.8 (2)° with the best mean plane of the pyridinium cation. The pyridinium cation and the tosyl-ate anion are hydrogen bonded to the water mol-ecule, and the crystal packing is further stabilized by inter-molecular C-H⋯O and π-π inter-actions [centroid-centroid separations of 3.648 (3) and 3.594 (2) Å.
Project description:The title compound, C44H62O6S2 {systematic name: (1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-5a,5b,8,8,11a-penta-methyl-1-(prop-1-en-2-yl)-3a-[(tos-yloxy)meth-yl]icosa-hydro-1H-cyclo-penta-[a]chrysen-9-yl 4-methyl-benzene-sulfonate}, was obtained by tosyl-ation of naturally occurring betulin. All the cyclo-hexane rings adopt chair conformations and the cyclo-pentane ring adopts a twisted envelope conformation, with the C atom bearing the tosyl-methyl substituent forming the flap. In the crystal, mol-ecules form a three-dimensional network through multiple weak C-H⋯O hydrogen bonds.
Project description:In the cation of the title compound, C14H13BrN(+)·C7H7O3S(-), the dihedral angle between the benzene and pyridine rings is 8.34 (11)°. The Br atom is disordered over two positions with site occupancies of 0.74 (2) and 0.26 (2). The mol-ecular structure is stabilized by a weak intra-molecular C-H⋯O inter-actions. The crystal structure exhibits weak C-H⋯O and π-π [centroid-centroid distance = 3.7466 (17) Å] inter-actions, forming a three dimensional network.
Project description:In the title compound, C(22)H(19)NO(5)S, the carbazole skeleton is nearly planar [maximum deviation = 0.043 (1) Å] with the pyrrole ring oriented at dihedral angles of 2.32 (6) and 1.77 (6)° with respect to the adjacent benzene rings. The dihedral angle between the benzene ring of the tosyl group and the carbazole skeleton is 82.25 (5)°. Intra-molecular O-H⋯O hydrogen bonding results in the formation of a planar six-membered ring, which is oriented at a dihedral angle of 3.06 (4)° with respect to the adjacent carbazole skeleton. In the crystal structure, weak inter-molecular C-H⋯O inter-actions link the mol-ecules into infinite chains and π-π contacts between the benzene rings and between the pyrrole and benzene rings [centroid-centroid distances = 3.374 (1) and 3.730 (1) Å, respectively] may further stabilize the structure. A weak C-H⋯π inter-action is also present.
Project description:The title steroid, C34H50O6S, is an inter-mediate on the synthetic route between diosgenin and brassinosteroids, which possess the A ring modified with the 2α,3α-diol functionality. The polycyclic spiro-stan system has the expected conformation, with six-membered rings adopting chair forms and the five-membered rings envelope forms (flap atoms are the methine C atom in the C/D-ring junction and the spiro C atom connecting rings E and F). The 3β-tosyl-ate group is oriented in such a way that S=O bonds are engaged in inter-molecular hydrogen bonds with O-H and C-H donors. Chains of mol-ecules are formed along [100] via O-H⋯O hydrogen bonds, and secondary weak C-H⋯O inter-actions connect two neighbouring chains in the [001] direction.
Project description:The title salt, C7H7N2 (+)·ClO4 (-), crystallizes with alternating cations and anions in wavy sheets, which are formed by a number of C-H⋯O and C-H⋯N hydrogen bonds, lying approximately parallel to (001).
Project description:The title compound, C(21)H(23)NO(7)S, is an important inter-mediate in the synthesis of poly(amido-amine) dendrimers. The cyclo-hexane ring adopts a chair conformation. The dihedral angle between the two aromatic rings is 69.5 (2)°. The mol-ecules are linked into a zigzag chain along the b axis by C-H⋯O hydrogen bonds.
Project description:In the title compound, [Mg(H(2)O)(6)](C(7)H(4)NO(4))(2), a single six-coordinate Mg(2+) cation (site symmetry 2/m) is bonded to six water mol-ecules in a distorted octa-hedral geometry. The crystal packing between the complex cation and the zwitterionic organic cation (m symmetry) is stabilized by inter-molecular O-H⋯O hydrogen bonds and weak inter-molecular C-H⋯O inter-actions.
Project description:The anion of the title compound, C(5)H(6)N(+)·C(5)H(2)NO(4)S(-), is approximately planar, with the carboxyl-ate and nitro group planes forming dihedral angles of 7.5 (3) and 3.5 (3)°, respectively, with the thio-phene ring. In the crystal structure, the cations and anions are linked into a two-dimensional network parallel to (011) by N-H⋯O and C-H⋯O hydrogen bonds.
Project description:The asymmetric unit of the title salt, C(5)H(7)N(2) (+)·C(5)H(7)O(4) (-), contains two 4-amino-pyridinium cations and two 4-carb-oxy-butano-ate anions. Each 4-amino-pyridinium cation is planar, with a maximum deviation of 0.005 (2) Å. Both 4-carb-oxy-butano-ate anions adopt an extended conformation. In the crystal structure, the cations and anions are linked via N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds, forming a two-dimensional network parallel to the bc plane.