2 edition of Tandem reactions of oxiranylcarbinyl radicals found in the catalog.
Tandem reactions of oxiranylcarbinyl radicals
John Andrew Rudderham
Written in English
Thesis (Ph.D.) - Loughborough University, 1997.
|Statement||by John Andrew Rudderham.|
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Oxiranylcarbinyl radicals (4) formed by photolysis of 3β-acetoxy-4 ξ, 5 ξ-epoxycholestanes in HMPA/H2O and by Bu3SnH reduction of 4ξ,5ξ-epoxy-3. Advanced Free Radical Reactions for Organic Synthesis reviews information on all types of practical radical reactions, e.g. cyclizations, additions, hydrogen-atom abstractions, decarboxylation Author: H.
Togo. Absolute Rate Constants for Reactions of Tributylstannyl Radicals with Bromoalkanes, Episulfides, and α-Halomethyl-Episulfides, -Cyclopropanes, and -Oxiranes: New Rate Expressions for Sulfur and Bromine Atom Abstraction Kinetics of the Oxiranylcarbinyl Radical Rearrangement.
The Tandem Radical Cyclization Approach to Angular Cited by: Trimethyl Phosphite as a Trap for Alkoxy Radicals Formed from the Ring Opening of Oxiranylcarbinyl Radicals. Conversion to Alkenes. Journal of the American Chemical Society, 11, (Book Review) Publication Date (Web): January 7, First Page.
Ring-opening reactions of aryl substituted oxiranylcarbinyl radicals have shown that C C bond cleavage is reversible and in competition with C O bond cleavage even when no products arising from C C bond cleavage are obtained The related cyclohexyl-derived radical (11) undergoes fragmentation at 25±30 C at a rate of s 1 as.
The reactions also occur with a wide variety of carbon-based radicals, from simple alkyl radicals to acyl radicals, and have been carried out in both inter- and intramolecular fashions . There are three main advantages to constructing carbon-carbon bonds using radical fragmentation reactions, as opposed to standard tin hydride-based.
Thus, for oxiranylcarbinyl radicals from haloepoxi 12, C-O scission (k(1), 2 --> 3) competes readily with C-C cleavage (k(2), 2 --> 4), even though C-C scission is favored. Selective deuteration illuminates the importance of tunneling in the unimolecular decay of Criegee intermediates to hydroxyl radical products.
SciTech Connect. Abeta does not silence the redox activity of Cu(2+/+) via chelation, but rather hydroxyl radicals produced as a result of Fenton-Haber Weiss reactions of ascorbate and Cu(2+) rapidly react with Abeta; thus the potentially harmful radicals are quenched.
In support of this, chemical modification of the Abeta peptide was examined using (1)H NMR. Organic Reaction Mechanisms, An Annual Survey Covering the Literature Dated December to November Edited b.