Crystal Structure and Antioxidant Activity of 5,6-O-(4-chlorophenyl)-L-Ascorbic Acid Synthesized with Nanosolid Superacid.

The title compound 5,6-O-(4-chlorophenyl)-L-ascorbic acid (C13H11ClO6) was synthesized using nanosolid superacid SO2-4/SnO2 as a catalyst and its structure was characterized by IR, 1H NMR and single-crystal X-ray diffraction. 1H NMR data indicated the product is a mixture of two diastereomer compounds (a(7S) and b(7R)). And the crystal of one diastereomer compound a(7S) belongs to orthorhombic system, space group P212121 with a = 6.

Properties and Applications of Sodium (5-methyl-2-alkyl-1,3-dioxane-5-yl)-Carboxylate Synthesized with Nanosolid Superacid.

A series of novel sodium (5-methyl-2-alkyl-1,3-dioxane-5-yl) carboxylate surfactants were synthesized using nanosolid superacid SO₄²⁻/Fe₂O₃as a catalyst and characterized by ¹H NMR, IR and elemental analysis. The critical micelle concentration (CMC) of surfactants was determined and the results showed that the CMC values were less than 2.0 x 10⁻³ mol/L.

Crystal Structure and Antibacterial Activity of (E)-(5-ethyl-2-styryl-1,3-dioxan-5-yl) Methanol Synthesized with Nanosolid Superacid.

A new chiral 1,3-dioxane compound was synthesized by aldol condensation reaction in this paper. The reaction of cinnamic aldehyde with 2.1 equiv.

catena-Poly[[[(5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-decane-κ(4)N)nickel(II)]-μ-oxido-[dioxidotungstate(VI)]-μ-oxido] tetra-hydrate].

In the title compound, {[NiWO(4)(C(16)H(36)N(4))]·4H(2)O}(n), the Ni(II) ion lies on an inversion center and is octahedrally coordinated by four N atoms of the tetradentate macrocyclic 5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-decane (L) ligand in the equatorial plane and two O atoms of [WO(4)](2-) anions in axial positions. Each [WO(4)](2-) anion bridges two adjacent [NiL](2+) cations, forming a chain along [001]. The chains are further connected via N-H⋯O, O-H⋯O and C-H⋯O hydrogen-bonding inter-actions, generating a three-dimensional structure.

2-(2-Chloro-phen-yl)-5-methyl-1,3-dioxane-5-carboxylic acid.

In the title compound, C(12)H(13)ClO(4), the 1,3-dioxane ring adopts a chair conformation and the 2-chloro-benzene and methyl substituents occupy equatorial sites. The carboxyl group is in an axial inclination. In the crystal, carb-oxy-lic acid inversion dimers linked by pairs of O-H⋯O hydrogen bonds generate R(2) (2)(8) loops.

(5-n-Heptyl-2-hydroxymethyl-1,3-dioxan-2-yl)methanol.

In the title compound, C(13)H(26)O(4), the dioxane rings adopts a chair conformation; the n-heptyl chain occupies an equatorial position. In the crystal, mol-ecules are connected by O-H⋯O hydrogen bonds into a zigzag chain running along the a axis, giving rise to a herringbone pattern. There are two independent mol-ecules in the asymmetric unit.

(5-n-Hexyl-2-hydroxymethyl-1,3-dioxan-2-yl)methanol.

In the title compound, C(12)H(24)O(4), the dioxane ring adopts a chair conformation; the n-hexyl chain, which occupies an equatorial position, has an extended zigzag conformation. In the crystal, mol-ecules are connected by O-H⋯O hydrogen-bonds into a zigzag chain running along the b axis, giving rise to a herringbone pattern.

(2-Carboxy-benzoato-κO,O)(5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-azacyclo-tetra-decane-κN)nickel(II) perchlorate monohydrate.

The title compound, [Ni(C(8)H(5)O(4))(C(16)H(36)N(4))]ClO(4)·H(2)O, has the Ni(II) atom in a distorted octa-hedral geometry, surrounded by coordination by four N atoms of the 5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-azacyclo-tetra-decane ligand in a folded configuration, and two carboxyl-ate O atoms of the 2-carboxy-benzoate ligand in cis positions. The complex cation, the disordered perchlorate anion [occupancies 0.639 (8):0.

2,2-Dimethyl-5-triphenyl-methyl-1,3-dioxane.

The title compound, C(25)H(26)O(2), crystallizes with two crystallographically independent mol-ecules in the asymmetric unit. The differences between the two mol-ecules are marginal. The three benzene rings of each mol-ecule are in a propeller orientation and the 1,3-dioxane ring adopts a chair conformation.

7,11,18,21-Tetra-oxatrispiro-[5.2.2.5.2.2]heneicosa-ne.

The four six-membered rings all adopt chair conformations in the two independent mol-ecules of the title cyclo-hexa-none cyclic diacetal with penta-erythritol, C(17)H(28)O(4).

Perillartine.

THE CHIRAL TITLE COMPOUND [SYSTEMATIC NAME: 4-(1-methyl-vinyl)cyclo-hexene-1-carbaldehyde oxime], C(10)H(15)NO, crystallizes with two mol-ecules in the asymmetric unit, one of which shows disorder of its propenyl substituent over two sets of sites in a 50:50 ratio. In both mol-ecules, the six-membered carbaldehyde oxime ring adopts an approximate envelope conformation in which the C atom bearing the propenyl substituent represents the flap position. In both mol-ecules, the plane passing through the propenyl substituent is nearly perpendicular to the mean plane of the six-membered ring [dihedral angles = 84.

Diethyl 2-(triphenyl-meth-yl)malonate.

In the title compound, C(26)H(26)O(4), steric crowding of the Ph(3)C- group with the -CH(CO(2)Et)(2) unit leads to a long C-C bond [1.585 (2) Å]. One of the two ethyl groups is disordered over two sites in a 60:40 ratio.

(Benzoato-κO,O')(5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-azacyclo-tetra-decane-κN,N',N'',N''')nickel(II) perchlorate benzoic acid solvate.

In the title compound, [Ni(C(7)H(5)O(2))(C(16)H(36)N(4))]ClO(4)·C(7)H(6)O(2), the Ni atom displays a distorted octa-hedral coordination geometry with four N atoms of the ligand rac-5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-azacyclo-tetra-decane (L) in a folded configuration and two benzoate (bz) O atoms. The [Ni(rac-L)(bz)](+) complex cation, perchlorate anion and benzoic acid mol-ecules engage in hydrogen bonding, with N⋯O distances between 2.970 (3) and 3.

catena-Poly[[bis-(μ(2)-4-amino-benzene-sulfonato-κO:O)disilver]-bis-(μ(2)-4,4'-bipyridine-κN:N')].

In the title compound, [Ag(2)(C(6)H(6)NO(3)S)(2)(C(10)H(8)N(2))(2)](n), the Ag(I) atom is four-coordinated by two N atoms from two symmetry-related 4,4'-bipyridine (bipy) and two O atoms from two independent 4-amino-benzene-sulfonate (ABS) ligands. The two inter-chain Ag(I) atoms are bridged by two independent ABS ligands through weak Ag-O bonds and Ag⋯Ag attractions, forming a ladder-like chain coordination polymer [Ag(2)(ABS)(2)(bipy)(2)](n) parallel to [001], which is further linked to generate a two-dimensional structure via N-H⋯O hydrogen-bonding inter-actions.

5,5-Bis(hydroxy-meth-yl)-2-phenyl-1,3-dioxane.

In the title compound, C(12)H(16)O(4), the 1,3-dioxane ring adopts a chair conformation; the 2-phenyl substitutent occupies an equatorial position. Adjacent mol-ecules are linked by O-H⋯O hydrogen bonds into a chain.

(Benzoato-κO,O')(5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-azacyclo-tetra-decane-κN,N',N'',N''')nickel(II) perchlorate monohydrate.

The Ni atom in the title salt, [Ni(C(7)H(5)O(2))(C(16)H(36)N(4))]ClO(4)·H(2)O, is in a six-coordinate octa-hedral geometry. The metal atom is chelated by the carboxyl-ate group, and the macrocyclic ligand adopts a folded configuration. The cation, anion and water mol-ecules engage in hydrogen bonding to form a layer structure.