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32 citations found for Edwards, M.
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The crystal structure of heptane-1,7-dicarboxylic acid (azelaic acid), C9H16O4, has been redetermined at 180 K. The molecular units have twofold symmetry and are linked via the ubiquitous syn-syn carboxylic acid dimer to form infinite chains running approximately along the [
01] vector.
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The crystal structure of octane-1,8-dicarboxylic acid (sebacic acid), C10H18O4, has been redetermined at 180 K. The molecular units are centrosymmetric and linked via the ubiquitous syn-syn carboxylic acid dimer to form infinite chains running along the [
01] vector.
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The structure of the title compound, tripotassium trans-tetracyanidodioxidotechnetate(V), is isotypic with its Re analogue. The [TcO2(CN)4]3− trans-tetracyanidodioxidotechnetate anion has a slightly distorted octahedral configuration. The Tc atom is located on a center of inversion and is bound to two O atoms in axial and to four cyanide ligands in equatorial positions. The Tc—O distance is consistent with a double-bond character. The two potassium cations, one located on a center of inversion and one in a general position, reside in octahedral or tetrahedral environments, respectively. K
O and K
N interactions occur in the 2.7877 (19)–2.8598 (15) Å range.
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The reaction between dibenzylideneacetone (dba) and triisopropyl sulfoxonium tetrafluoroborate has been reinvestigated. The stereochemistry of the major diasteromeric bis(gem-dimethylcyclopropane) adduct has now been assigned as [(1RS,3RS)-2,2-dimethyl-3-phenylcyclopropyl][(1SR,3SR)-2,2-dimethyl-3-phenylcyclopropyl]methanone, C23H26O, by X-ray crystallographic studies on a twinned crystal. The asymmetric unit contains two molecules of the adduct, the conformations of which differ in the orientation of the phenyl ring relative to the adjacent cyclopropanated double bond. The carbonyl groups of each adduct are aligned approximately along the a axis and in opposite directions to each other. The molecules pack to give a sinusoidal pattern along the b axis. This is the first acyclic bis(dimethylcyclopropyl) ketone for which an X-ray crystal structure determination has been reported, and is also the first bis-cyclopropanated dba analogue. The knowledge that the major diastereomer has the meso structure (and therefore the confirmation that the minor isomer is the racemate) will prove invaluable in future studies to utilize bis(dimethylcyclopropyl) ketones as reagents, in rearrangement processes, and as potential ligands and ligand precursors in organometallic chemistry.
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Crystals of a complex formed between the 59 kDa N-terminal fragment of the E. coli DNA gyrase A subunit and the antibiotic simocyclinone D8 were obtained and X-ray data were recorded to a resolution of 2.75 Å.
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