1,721,027 research outputs found
Different Approaching Directions of ς and ϖ Nucleophiles to the Sulfur Atom of Thiiranium and Thiirenium Ions.
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Addition of Azomethyne Ylides to Fullerene C60 Assisted by a Removable Anchor
No full textJ. ORG. CHEM
Oxofunctionalization of Non-natural Targets by Dioxiranes. Efficient Oxidation of Buckminsterfullerene C60 with Methyl(trifluoromethyl)dioxirane
No full textX-ray Structures and Anionotropic Rearrangenents of Di-tert-butyl Substituted Thiiranium and Thiirenium Ions. A Structure-Reactivity Relationship
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A novel criterion for the evaluation of the contrast capacity of antioxidants toward lipid peroxidation
No full textIn order to overcome the uncertain derived from the different in vitro chemical-based assays described in literature to determine the antioxidant capacity of natural products, the oxygraphic method for the definition of a new criterion for assessing the contrast ability of antioxidants toward lipid peroxidation have been developed in aqueous micelle systems.The functional expression, based on the concept of competitive kinetics, is given by the ratio between the initial rates inferred from the oxygraphic traces monitored in the absence and in the presence of antioxidant. The value kA/k0[LH] with dimension mM-1, precisely describe the scavenging (or chain breaking) power of the studied antioxidants toward lipid peroxidation. Furthermore, we verified the possibility of use this method to create an absolute scale of antioxidant activity of molecules to apply also to more complex matrices, such as food (e.g. olive oil, wine), in order to establish a protocol for the determination of their antioxidant characteristics and protective action in conservation and human health
Nucleophilic Reactions at the Sulfur of Thiiranium and Thiirenium Ions. New Insight in the Electrophilic Additions to Alkenes and Alkynes. Evidence for an Episulfurane Intermediate.
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