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2,4,8,10-Tetra-oxa-3,9-dithia-spiro-[5.5]undecane 3,9-dioxide.

ABSTRACT: The asymmetric unit of the title compound, C(5)H(8)O(6)S(2), consists of two spiro-[5.5]undecane mol-ecules. The nonplanar six-membered rings adopt chair conformations. In the crystal structure, weak inter-molecular C-H⋯O inter-actions, together with close O⋯S contacts in the range 3.308 (3)-3.315 (3) Å, stabilize the packing.

SUBMITTER: Rao ZY

PROVIDER: S-EPMC2967953 | biostudies-literature |

REPOSITORIES: biostudies-literature

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3,9-Di-2-furyl-2,4,8,10-tetra-oxa-spiro-[5.5]undecane.

Project description:The title compound, C(15)H(16)O(6), was prepared by reaction of 2,2-bis-(hydroxy-meth-yl)propane-1,3-diol with 2-furaldehyde in the presence of hydro-chloric acid at room temperature. The asymmetric unit contains two crystallographically independent mol-ecules. In these two mol-ecules, the dihedral angles between the five-membered rings are 56.4?(3) and 56.3?(3)°. The six-membered rings adopt chair conformations. Inter-molecular C-H?? inter-actions link the mol-ecules and may be effective in the stabilization of the crystal structure.

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3,9-Dichloro-2,4,8,10-tetra-oxa-3,9-di-phosphaspiro-[5.5]undecane-3,9-dione.

Project description:In the title compound, C(5)H(8)Cl(2)O(6)P(2), the two six-membered rings display chair conformations. The P=O bond distances are 1.444?(2) and 1.446?(2)?Å. Weak inter-molecular C-H?O hydrogen bonds are present in the crystal structure.

| S-EPMC3009252 | biostudies-literature

3,9-Di-1-naphthyl-2,4,8,10-tetra-oxa-spiro-[5.5]undeca-ne.

Project description:In the title compound, C(27)H(24)O(4), the 1,3-dioxane rings have chair conformations. The mol-ecule has non-crystallographic twofold rotation symmetry. The dihedral angle between the naphthalene ring systems is 17.96(4)° In the crystal structure, weak inter-molecular C-H?? inter-actions contribute to the crystal packing.

| S-EPMC2979257 | biostudies-literature

3,3,9,9-Tetra-phenyl-2,4,8,10-tetra-oxa-spiro-[5.5]undeca-ne.

Project description:In the title compound, C(31)H(28)O(4), the asymmetric unit contains two crystallographically independent mol-ecules. In these two mol-ecules, the four dihedral angles between each pair of phenyl rings on the same C atoms are 75.4?(1), 83.0?(1), 85.0?(1) and 80.4?(2)°. All of the nonplanar six-membered heterocycles adopt chair conformations. Inter-molecular C-H?? and weak C-H?O inter-actions link the mol-ecules and are effective in the stabilization of the crystal structure.

| S-EPMC3009283 | biostudies-literature

Crystal structure of rac-3,9-bis-(2,6-di-fluoro-phen-yl)-2,4,8,10-tetra-oxa-spiro[5.5]undeca-ne.

Project description:The title compound, C19H16F4O4, was prepared by the condensation reaction of 2,6-di-fluoro-benzaldehyde and penta-erythritol. The whole mol-ecule is generated by twofold rotational symmetry. The two six-membered O-heterocycles adopt chair conformations through a shared spiro-carbon atom that is located on the crystallographic twofold rotation axis. In this conformation, the two aromatic rings are located at the equatorial positions of the O-heterocycles. The conformation of this doubly substituted tetra-oxa-spiro system is chiral. In the crystal, mol-ecules are linked by C-H?O hydrogen bonds, forming layers parallel to (100). These layers are linked by C-H?F hydrogen bonds into a three-dimensional structure.

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3,9-Diisopropyl-2,4,8,10-tetra-thia-spiro-[5.5]undeca-ne.

Project description:The mol-ecule of the title compound, C(13)H(24)S(4), has C2 symmetry and it crystallizes as a racemate. The structure displays two six-membered rings exhibiting chair conformations, with the isopropyl substituents in equatorial positions. In the crystal structure, weak inter-molecular C-H?S inter-actions are observed, leading to a channel-like arrangement along the c axis.

| S-EPMC2983234 | biostudies-other

3,9-Di-tert-butyl-2,4,8,10-tetra-oxaspiro-[5.5]undeca-ne.

Project description:The title compound, C(15)H(28)O(4), was prepared by the condensation of pivalaldehyde with penta-erythritol. In the crystal, the two halves of the mol-ecule are related by a crystallographic twofold rotation axis passing through the central spiro-C atom. The two non-planar six-membered heterocycles both adopt chair conformations with the two tert-butyl groups both located in the equatorial positions.

| S-EPMC3011739 | biostudies-literature

7,11-Bis(4-methyl-phen-yl)-2,4,8,10-tetra-azaspiro-[5.5]undecane-1,3,5,9-tetra-one.

Project description:In the mol-ecule of the title compound, C(21)H(20)N(4)O(4), the two methyl-phenyl rings are oriented at a dihedral angle of 59.32 (4)°. The other two rings have flattened-boat conformations. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules. There are C-H⋯π contacts between a methyl-phenyl ring and methyl and methine groups.

| S-EPMC2961972 | biostudies-literature

3,9-Bis(2,4-dichloro-phen-yl)-2,4,8,10-tetra-oxaspiro-[5.5]undeca-ne.

Project description:In the title compound, C(19)H(16)Cl(4)O(4), the two halves of the mol-ecule are related by a crystallographic twofold rotation axis passing through the central spiro-C atom. The two non-planar six-membered heterocycles both adopt chair conformations, and the dihedral angle between the two benzene rings is 76.6?(1)°. In the crystal structure, inter-molecular C-H?O hydrogen bonds link the mol-ecules into chains along the c axis.

| S-EPMC3007031 | biostudies-literature

3,9-Bis(2-chloro-phen-yl)-2,4,8,10-tetra-oxaspiro-[5.5]undeca-ne.

Project description:The complete mol-ecule of the title compound, C(19)H(18)Cl(2)O(4), is generated by a crystallographic twofold axis that passes through the spiro C atom. The 1,3-dioxane ring adopts a chair conformation and the phenyl substituent occupies an equatorial site.

| S-EPMC2979752 | biostudies-literature

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