Results 91 to 100 of about 21,746 (290)
Asymmetric one-pot synthesis of cyclopropanes
Macedonian Journal of Chemistry and Chemical Engineering, 2016 Cycloaddition of the diazoalkanes to electron-deficient olefins (in situ) affords polysubstituted cyclopropanes in high yields (up to 85%). Deprotection of the ketal protecting group provided water-soluble cyclopropane-bearing carbohydrate in good yields.
Naoufel Ben Hamadi +2 more
doaj +1 more source
Iron-mediated Preparation of Vinylcyclopropanes. Scope, Mechanism, and Applications [PDF]
, 2003 The addition of stabilized carbon nucleophiles to tricarbonyl(1-methoxycarbonylpentadienyl)iron(1+) cation (1a) proceeds via attack at C2 on the face of the ligand opposite the Fe(CO)3 group to generate tricarbonyl(pentenediyl)iron complexes 2. Oxidation
Cao, Yeyu +3 more
core +1 more source
Using Semantic Technologies in Digital Libraries- A Roadmap to Quality Evaluation [PDF]
, 2009 . In digital libraries semantic techniques are often deployed to reduce the expensive manual overhead for indexing documents, maintaining metadata, or caching for future search.
A. Hotho +12 more
core +2 more sources
Ximenia americana L. From Popular Use to Anti‐Inflammatory Activities: A Comprehensive Review
Food Frontiers, Volume 7, Issue 2, March 2026.ABSTRACT Ximenia americana (L.), known as “yellow plum,” “sea lemon,” or “Brazilian plum,” is a tropical/subtropical plant widely used in traditional medicine. Its roots, leaves, flowers, stem, and fruits are traditionally employed to treat various inflammatory disorders.
Bruno Anderson F. Silva +9 more
wiley +1 more source
Angewandte Chemie, Volume 138, Issue 2, 9 January 2026.By harnessing chalcogen bonding (ChB) catalysis, an exclusive access into a highly stereoselective strain‐release C‐glycosylation pathway was discovered. This was surprisingly not replicable by the conceptually similar halogen bonding (XB) catalysis.
Hao Guo, Charles C. J. Loh
wiley +2 more sources
The Oxidative Reaction of Potassium Permanganate with Mycolic Acids Leads to a Unique Diagnostic Pattern for Mycobacterium Tuberculosis [PDF]
, 2008 In an oxidative reaction, potassium permanganate reacts with the mycolic acid component of _M.tuberculosis_ and gives rise to a unique saponified pattern specific for _M.tuberculosis_.
Mohsen khatami
core +1 more source
Stereoselective Lewis Acid Mediated (3+2) Cycloadditions of N-H- and N-Sulfonylaziridines with Heterocumulenes [PDF]
, 2014 Alkyl and aryl isothiocyanates and carbodiimides are effective substrates in (3+2) cycloadditions with N-sulfonyl-2-substituted aziridines and 2-phenylaziridine for the synthesis of iminothiazolidines and iminoimidazolidines.
Craig, Robert A., II +3 more
core +2 more sources
Technologies and Strategies for Metabolic and Molecular Imaging With Hyperpolarized MRI
Journal of Magnetic Resonance Imaging, Volume 63, Issue 2, Page 310-327, February 2026.ABSTRACT Conventional Magnetic Resonance Imaging (MRI) offers limited sensitivity for direct metabolic and molecular imaging using non‐proton nuclei due to low thermal nuclear spin polarization. Hyperpolarization (HP) technologies increase nuclear spin polarization by several orders of magnitude, overcoming this limitation to enable in vivo studies of ...
Alixander S. Khan, Christoffer Laustsen
wiley +1 more source
On the Nature of Improper Hydrogen Bonding in RCH2F and RCHF2 Motifs
Angewandte Chemie, Volume 138, Issue 2, 9 January 2026.The nature of ‘improper’ hydrogen bonds is explored in FnC─H⋯X systems, such as RCF2H interaction with chloride and water. It is noted that increased fluorination decreases the positive charge density on H but increases it on C, thus these interactions are dominated by electrostatic attraction to C over H.
Bruno A. Piscelli +3 more
wiley +2 more sources
Iodine-catalyzed diazo activation to access radical reactivity
Nature Communications, 2018 Radical reactivity of diazo compounds, useful organic building blocks, is yet underexplored. Here, the authors report an iodine-catalyzed radical activation of diazo compounds affording a variety of substituted cyclopropanes, pyrroles and epoxides under ...
Pan Li +5 more
doaj +1 more source