Global ETD Search
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Showing 1 to 10 of 10 for “"Geometric Isomers"”.
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Reactions of a super-electron donor with diarylcyclopropanes and epoxides
… selective deoxygenation of both cis- and trans-isomers of 2,3-bis(4-fluorophenyl)oxirane, 2,3-bis(4-chlorophenyl)oxirane and 2,3-diphenyloxirane was achieved by the DMAP-derived electron donor 1.57 (Scheme 1). In each case, only the trans-alkene product was isolated. The reaction conditions …
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The Synthesis of α-Tocopentaenol (αT5), a Fluorescent Analogue of α-Tocopherol
… Unfortunately, across the C3’ bond on the tail, geometric isomers were obtained. However, TBSO-αT5 was produced in what appeared to be ≈ 2:1 E:Z mixture across the C3’ bond (having the four other olefins with trans-configurations). α-Tocopentaenol showed a strong absorbance in ethanol with a …
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Synthesis, structure and chirality of some neutral cobalt (III) complexes
<p>Structures are assigned to the six stereoisomers of the complex 2 , 4-pentanedionatobis(S-alaninato)cobalt(III) and to the diastereomers of bis(2, 4-pentanedionato)S-aminoacidatocobalt(III), where the S-amino acid is S-alanine, S-valine, N-methyl-S-alanine and N-methyl-S-valine. Adsorption …
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Chlorine-38 for chlorine substitution in geometric and diastereomeric compounds: mechanism and stereochemistry
… 1,2-dichloro-1,2-difluoroethane and the geometric isomers of 1,2-dichlorohexa-fluorocyclobutane. In each system, the conformer population was determined by NMR and dipole moment techniques. A comparison was made between the changes of the stereochemical course of the substitution reaction …
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Polyaminocarboxylic Acids as Potential Candidates for Trivalent Actinide/lanthanide Separations
… the relative stabilities of the three possible geometric isomers for pseudo-octahedral polyaminocarboxylate metal complexes in solution. The calculations were supported by X-ray crystallographic data obtained for different Co(III) and Ga(III) polyaminocarboxylate complexes. Advanced 2D NOESY and …
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The effect of CLAs on the expression of PKC isoforms and cell viability in breast cancer cell lines.
… are naturally occurring positional and geometric isomers of the fatty acid linoleic acid (LA). CLAs have been shown to reduce growth and increase apoptosis in breast cancer cells, and to alter their PKC expression both in animal models and in various human cell lines. We investigated the …
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Amidate complexes of the group 4 metals : sythesis, reactivity, and hydroamination catalysis
… and undergo exchange processes. Multiple geometric isomers are possible with the mixed N,0 chelate provided by the amidate ligands, and geometric isomerization of bis(amidate) bis(amido) complexes has been examined through X-ray crystallographic and density functional theory (DFT) …
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Fermentation of vitamin K2 (menaquinone-7): Development of an optimal fermentation process to selectively enhance the production of the biologically significant all-trans isomer
… it has been recognised that MK-7 exists as geometric isomers, comprising the bioactive all-trans isomer and various cis forms of the compound, which lack or have considerably compromised biological significance. This is a salient aspect worthy of attention, as the effectiveness of MK-7 …