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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.

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

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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-[(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 ?-? 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.

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| S-EPMC3011628 | biostudies-literature

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

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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. ?-? 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.

| S-EPMC3238813 | biostudies-other

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.

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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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