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Diethyl 2,5-bis-[(E)-2-furylmethyl-ene-amino]thio-phene-3,4-dicarboxyl-ate.

ABSTRACT: The title compound, C(20)H(18)N(2)O(6)S, crystallizes as two independent mol-ecules that are disposed about a pseudo-inversion center (1/2, 1/4, 1/8). The mean planes of the two terminal furyl rings are twisted with respect to the central thio-phene ring by 7.33 (4) and 21.74 (5)° in one mol-ecule, and by 6.91 (4) and 39.80 (6)° in the other.

SUBMITTER: Dufresne S

PROVIDER: S-EPMC2960980 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Diethyl 3,4-bis(acetoxy-meth-yl)thieno[2,3-b]thio-phene-2,5-dicarboxyl-ate.

Project description:In the title compound, C(18)H(20)O(8)S(2), the dihedral angle between the two thio-phene rings is 2.33?(7)°. The methyl C atoms of the ester groups are disordered over two positions; the site-occupancy factors of the terminal methyl C atoms are 0.632?(18):0.368?(18) and 0.623?(17):0.377?(17). The mol-ecular structure is stabilized by weak intra-molecular C-H?O inter-actions and the crystal structure is stabilized through weak inter-molecular C-H?O inter-actions.

| S-EPMC2970297 | biostudies-literature

Diethyl 3,4-dimethyl-thieno[2,3-b]thio-phene-2,5-dicarboxyl-ate.

Project description:In the title compound, C14H16O4S2, the thieno[2,3-b]thio-phene ring systems are planar [maximum deviation = 0.008 (2) Å]. The mol-ecular conformation is stabilized by intra-molecular C-H⋯O hydrogen bonds, while the crystal packing is stabilized by C-H⋯O, C-H⋯π and π-π stacking [centroid-centroid distance = 3.6605 (14) Å] inter-actions, which lead to supra-molecular layers in the ab plane.

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Bis(triphenyl-stann-yl) thio-phene-2,5-dicarboxyl-ate.

Project description:Mol-ecules of the title compound, [Sn(2)(C(6)H(5))(6)(C(6)H(2)O(4)S)], lie on inversion centres with the central thio-phene ring disordered equally over two orientations. The carboxyl-ate groups are approximately coplanar with the thio-phene ring [dihedral angle = 4.0?(1)°] and the Sn-O bond distance of 2.058?(4)?Å is comparable to that in related organotin carboxyl-ates.

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Diethyl 2,5-bis-[(2,3-dihydro-thieno[3,4-b][1,4]dioxin-5-yl)methyl-idene-amino]-thio-phene-3,4-dicarboxyl-ate acetone monosolvate.

Project description:The unique 3,4-ethyl-ene-dioxy-thio-phene (EDOT) unit of the title compound, C(24)H(22)N(2)O(8)S(3)·C(3)H(6)O, is twisted by 1.9 (3)° relative to the central thio-phene ring. The three heterocyclic units are anti-periplanar. In the crystal, inversion dimers linked by pairs of C-H⋯O hydrogen bonds connect the heterocycles. π-π interactions occur between the central thiophene and the imine bond of the molecule [distance between the ring centroid of the ring and the azomethine bond = 3.413 (3) Å.

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Diethyl 2,5-bis-[(1E)-(1H-pyrrol-2-yl-methyl-idene)amino]-thio-phene-3,4-dicarboxyl-ate.

Project description:In the crystal structure of the title compound, C(20)H(20)N(4)O(4)S, the azomethine group adopt E conformations. The pyrrole units are twisted by 10.31?(4) and 18.90?(5)° with respect to the central thio-phene ring. The three-dimensional network is close packed and involves N-H?O, N-H?N, C-H?N and C-H?O hydrogen bonding.

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Diethyl 2-[(1-methyl-1H-pyrrol-2-yl)methyl-ene-amino]-5-(2-thienylmethyl-ene-amino)thio-phene-3,4-dicarboxyl-ate.

Project description:Both imine bonds of the title compound, C(21)H(21)N(3)O(4)S(2), were found to be in the E configuration. The terminal pyrrole and thio-phene rings are twisted by 2.5 (3) and 2.3 (2)°, respectively, from the mean plane of the central thio-phene to which they are attached. The structure is disordered by exchange of the terminal heterocyclic rings; the site occupancy factors are ca 0.8 and 0.2. The crystal packing involves some π-π stacking [3.449 (4) Å between pyrrole and terminal thio-phene rings].

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Diethyl 2,5-diphenyl-furan-3,4-dicarboxyl-ate.

Project description:In the title compound, C(22)H(20)O(5), the substituted benzene rings are twisted away from the furan ring, making dihedral angles of 54.91?(14) and 20.96?(15)° with the furan ring. The dihedral angle between the two benzene rings is 46.89?(13)°. One ethyl group of one eth-oxy-carbonyl unit is disordered over two sets of sites with occupancies of 0.56?(12) and 0.44?(12). In the crystal, weak intra-molecular C-H?O hydrogen bonds link the mol-ecules into chains along the c axis.

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Diethyl 3,4-bis-(2,5-dimethoxy-benz-yl)thieno[2,3-b]thio-phene-2,5-di-car-boxylate.

Project description:In the title compound, C(30)H(32)O(8)S(2), the dihedral angle between the two benzene rings is 18.8?(1)°. The mol-ecular structure is stabilized by weak intra-molecular C-H?O hydrogen bonds. In the crystal structure, the mol-ecules are linked via weak inter-molecular C-H?O hydrogen bonds and ?-? inter-actions between two benzene rings [centroid-centroid distance = 3.672?(1)?Å].

| S-EPMC2971147 | biostudies-literature

Diethyl 5-acetamido-3-methyl-thio-phene-2,4-dicarboxyl-ate.

Project description:The title compound, C(13)H(17)NO(5)S, is approximately planar (r.m.s. deviation for the non-H atoms = 0.055?Å). Its conformation is stabilized by N-H?O and C-H?O hydrogen bonds, which both generate S(6) rings. The crystal packing only features van der Waals contacts.

| S-EPMC3011754 | biostudies-literature

Poly[tetra-aqua-bis-(μ(4)-thio-phene-2,5-dicarboxyl-ato)(μ(2)-thio-phene-2,5-dicarboxyl-ato)dieuropium(III)].

Project description:The three-dimensional coordination polymer, [Eu(2)(C(6)H(2)O(4)S)(3)(H(2)O)(4)](n), has been synthesized under hydro-thermal conditions. The asymmetric unit comprises one Eu(3+) cation, two aqua ligands and one and a half thiophene-2,5-dicarboxylate anions (the half-anion being completed by a twofold rotation axis). The Eu(3+) cation is eight-coordinated in a distorted dodeca-hedral geometry. The crystal structure features O-H⋯O hydrogen bonds.

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