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Diethyl 6,9,17,20-tetra-bromo-2,13-di-oxo-hexa-cyclo-[10.10.2.0.0.0.0]tetra-cosa-5,7,9,16,18,20-hexa-ene-23,24-dicarboxyl-ate.

ABSTRACT: In the title mol-ecule, C(26)H(22)Br(4)N(4)O(6), the dihedral angle between the aromatic rings is 30.0 (1)°. One ethyl fragment is disordered between two positions in a 1:1 ratio. The crystal packing exhibits weak inter-molecular C-H⋯O hydrogen bonds and short Br⋯O contacts of 3.349 (6) Å.

SUBMITTER: Zhu Y

PROVIDER: S-EPMC2968834 | biostudies-literature | 2009 Mar

REPOSITORIES: biostudies-literature

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Diethyl 6,9,17,20-tetra-bromo-2,13-di-oxo-hexa-cyclo-[10.10.2.0.0.0.0]tetra-cosa-5,7,9,16,18,20-hexa-ene-23,24-dicarboxyl-ate.

Zhu Yanping Y Chen Yan Y Sun Yichong Y

Acta crystallographica. Section E, Structure reports online 20090319 Pt 4

In the title mol-ecule, C(26)H(22)Br(4)N(4)O(6), the dihedral angle between the aromatic rings is 30.0 (1)°. One ethyl fragment is disordered between two positions in a 1:1 ratio. The crystal packing exhibits weak inter-molecular C-H⋯O hydrogen bonds and short Br⋯O contacts of 3.349 (6) Å. ...[more]

PMID: 21582527

Similar Datasets

Diethyl 7,8,18,19-tetra-methyl-2,13-dioxo-hexa-cyclo-[10.10.2.0.0.0.0]tetra-cosa-5,7,9,16,18,20-hexa-ene-23,24-dicarboxyl-ate.

Project description:The asymmetric unit of the title compound, C(30)H(34)N(4)O(6), contains two independent mol-ecules. In one independent mol-ecule, the two eth-oxy-carbonyl groups are each disordered over two conformations with occupancy ratios of 0.586 (2):0.414 (2) and 0.508 (2):0.492 (2). The crystal packing exhibits weak inter-molecular C-H⋯O hydrogen bonds.

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Project description: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.

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Diethyl pyrazine-2,5-dicarboxyl-ate.

Project description:The mol-ecule of the title compound, C(10)H(12)N(2)O(4), is located around an inversion center. The carboxyl-ate groups are twisted slightly with respect to the pyrazine ring, making a dihedral angle of 2.76 (19)°. In the crystal, mol-ecules are stacked along the c axis via weak C-H⋯O hydrogen bonds.

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Diethyl indolizine-1,3-dicarboxyl-ate.

Project description:The title compound, C(14)H(15)NO(4), was prepared by a 1,3-dipolar cyclo-addition from N-(eth-oxy-carbonyl-methy)pyridinium bromide and ethyl acrylate. The -CO(2) side chains form dihedral angles of 0.2 (3) and 2.4 (3)° with respect to the ring system. In the crystal, two neighbouring mol-ecules form a dimer through weak C-H⋯O interactions. The dimers form a three-dimensional structure via further weak C-H⋯O inter-actions.

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Diethyl 1,4-bis-(4-nitro-phen-yl)-1,4-dihydro-1,2,4,5-tetra-zine-3,6-dicarboxyl-ate.

Project description:The complete mol-ecule of the title compound, C(20)H(18)N(6)O(8), is generated by a crystallographic twofold axis. The dihedral angle between the nitrobenzene rings is 43.5 (2)°. The central six-membered ring exhibits a boat conformation. In the crystal structure, weak inter-molecular C-H⋯O inter-actions are observed.

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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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Ethyl 8,13-dioxa-21-aza-penta-cyclo-[18.5.1.0(2,7).0(14,19).0(21,25)]hexa-cosa-2(7),3,5,14,16,18-hexa-ene-26-carboxyl-ate.

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