Redetermination of tetramethyl tetrathiafulvalene-2,3,6,7-tetracarboxylate

Katzsch, Felix; Weber, Edwin

doi:10.1107/s1600536812029534

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Calixarenes containing modified meso bridges [46][47][48] are synthesized via substitution of methylene bridges [49][50][51][52] or via their oxidation to keto groups; 53,54 they have not been as intensively studied as calixarenes functionalized at wide 55,56 or narrow 57.58 rims. Therefore it seems of interest to describe several selected examples of this class of compounds, showing their possible applications.…”

Section: Introductionmentioning

confidence: 99%

Calixarenes containing modified meso bridges

Deska¹,

Dondela²,

Śliwa³

2014

Arkivoc

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Section: Introductionmentioning

confidence: 99%

Calixarenes containing modified meso bridges

Deska¹,

Dondela²,

Śliwa³

2014

Arkivoc

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Conformational studies on substituted ε-caprolactams by X-ray crystallography and NMR spectroscopy

et al. 2014

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The synthesis and conformational analysis of e-caprolactams containing a-COOMe group at the C-6 position is described. The influence of different C-2, C-6 and N substituents on ring conformation was studied using X-ray crystallography and NMR spectroscopy. The results provide evidence that all the analysed caprolactams adopt a chair type conformation with a planar lactam. In the 6-substituted caprolactam, the-COOMe residue prefers to reside in an equatorial position, but can be induced to occupy an axial orientation by the introduction of a bulky tert-butyloxycarbonyl (BOC) group on the lactam nitrogen or by C-2/C-3 ring desaturation. The BOC protected caprolactam was found to undergo exchange between two chair forms as detected by solution NMR, one with the C-6 ester equatorial (30%) and the other with it in the axial position (70%); the latter was observed by X-ray crystallography. For the C-2 dithiocarbamate substituted C-6 methyl ester sevenmembered rings, a single chair form is observed for cis-isomers with both substituents equatorial. The analogous trans-isomers, however, exist as two chair forms in a 1 : 1 equilibrium ratio of 1,N C 4 and 4 C 1,N conformers, where either substituent can occupy axial or equatorial positions.

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5,5′-(Ethyne-1,2-diyl)diisophthalic acid dimethyl sulfoxide tetrasolvate

et al. 2013

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In the title compound, C18H10O8·4C2H6OS, the mid-point of the triple bond of the main molecule is located on a special position, i.e. about an inversion center. The carboxyl groups are twisted slightly out of the planes of the aromatic rings to which they are attached, making dihedral angles of 24.89 (1) and 7.40 (2)°. The cystal packing features strong O—H⋯O hydrogen bonds, weaker C—H⋯O interactions and O⋯S contacts [3.0981 (11) Å] and displays channel-like voids extending along the a-axis direction which contain the dimethyl sulfoxide solvent molecules.

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Redetermination of tetramethyl tetrathiafulvalene-2,3,6,7-tetracarboxylate

Cited by 3 publications

References 17 publications

Calixarenes containing modified meso bridges

Calixarenes containing modified meso bridges

Conformational studies on substituted ε-caprolactams by X-ray crystallography and NMR spectroscopy

5,5′-(Ethyne-1,2-diyl)diisophthalic acid dimethyl sulfoxide tetrasolvate

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