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Syntheses and crystal structures of new naphthalene- and anthracene-vanadate salts and an unprecedented dimetallabis(anthracene) sandwich complex: [Na(tetrahydrofuran)][V(anthracene)].
Acta Crystallogr C Struct Chem
March 2022
Department of Chemistry, 207 Pleasant Street SE, University of Minnesota, Minneapolis, MN 55455, USA.
Reduction of bis(naphthalene)vanadium(0) by potassium naphthalene (KNp) in tetrahydrofuran (THF) provides a highly reactive, thermolabile, and so far unisolable brown substance, which affords the first reported derivatives of bis(naphthalene)vanadates. From these solutions, thermally stable (298 K) and structurally characterized compounds have been obtained, including dark-red rods of catena-poly[bis(μ-η:η:η-naphthalene)tetrakis(tetrahydrofuran)dipotassiumvanadium], [KV(CHO)(CH)] or [K(THF)][V(CH)] (3), and red plates of (4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.
View Article and Find Full Text PDFIdentification of a novel norketamine precursor from seized powders: 2-(2-chlorophenyl)-2-nitrocyclohexanone.
Forensic Sci Int
April 2022
Department of Forensic Science, Investigation Bureau, Ministry of Justice, Xindian Dist, New Taipei City 231209, Taiwan.
The identification of new psychoactive substances (NPSs) and their precursors is crucial to understand trends in NPSs so that they can be regulated before they pose a serious threat to human health. In this case, 24 bags containing approximately 600 kg of yellow powder were seized; the smugglers had been monitored for 3 years by the officers of Taiwan's Ministry of Justice Investigation Bureau. A handheld Raman analyzer yielded a positive result for N-boc norketamine; thus, the seized powder was sent to this laboratory for confirmation through gas chromatography-mass spectrometry, liquid chromatographyhigh-resolution mass spectrometry, proton nuclear magnetic resonance (H NMR), carbon-13 nuclear magnetic resonance (C NMR), two-dimensional correlation NMR measurements (2D_COSY), heteronuclear single-quantum correlation NMR measurements (2D_HSQC), and single-crystal X-ray diffraction.
View Article and Find Full Text PDFThermolabile Cross-Linkers for Templating Precise Multicomponent Metal-Organic Framework Pores.
J Am Chem Soc
July 2021
Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States.
Article Synopsis
- The text discusses the need for innovative strategies in creating multicomponent metal-organic frameworks (MOFs) that can mimic the complex active sites of enzymes, noting that current methods lack structural versatility and molecular precision.
- A new method is introduced that utilizes thermolabile ligand cross-linkers to organize functional groups within the framework's pores, allowing for precise installation of carboxylic acid pairs through the use of tertiary ester-based linkers that can be easily activated or cleaved.
- The research demonstrates successful synthesis and integration of these cross-linkers into a specific type of MOF, where modeling shows that the carboxylic acids are positioned in a consistent pattern, enabling future development of more advanced active sites.
Lewis Acid-Facilitated Radiofluorination of MN3PU: A LRRK2 Radiotracer.
Molecules
October 2020
Life Sciences Division, TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada.
Background: Temperature-sensitive radiopharmaceutical precursors require lower reaction temperatures (<100 °C) during nucleophilic radiofluorination in order to avoid compound thermolysis, often resulting in sub-optimal radiochemical yields (RCYs). To facilitate nucleophilic aromatic substitution (SAr) of nucleofuges commonly used in radiofluorination (e.g.
View Article and Find Full Text PDFSimultaneous determination of artemisinin and its analogs and flavonoids in Artemisia annua crude extracts with the use of NMR spectroscopy.
Magn Reson Chem
March 2020
Section of Organic Chemistry and Biochemistry, Department of Chemistry, University of Ioannina, Ioannina, Greece.
Artemisia annua is a promising and potent antimalarial herbal drug. This activity has been ascribed to its component artemisinin, a sesquiterpene lactone. The ability to determine artemisinin and its known analogs in plant extracts is an especially difficult task because the compounds are present in low concentrations, are thermolabile, and lack ultraviolet or fluorescent chromophores.
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