Titlebook: Organic Free Radicals; Proceedings of the F Hanns Fischer,Heinz Heimgartner Conference proceedings 1988 Springer-Verlag Berlin Heidelberg 1

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Rate Constants for Electron Transfer and Radical Cation Reactions of Methylated Naphthalenes,r both electron transfer (ET) and follow-up reactions of arene radical cation intermediates, [1–3] we are using this approach to study the effects of structure on the reactions of radical cations, especially the competition between side chain fragmentation and nucleophilic addition reactions. In thi

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Tris(Trimethylsilyl)Silane. A New Reducing Agent,atom abstraction(1) their corresponding silanes are rather poor H-atom donors towards alkyl radicals and therefore not do support chain reactions except at elevated temperatures(2). Recently we found that the silicon-hydrogen bonds can be dramatically weakened by multiple substitution of Me.Si group

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Polarized EPR Spectra of Unstable Biradicals,bonylation yields dialkyl biradicals. EPR signals are obtained by direct detection with a boxcar averager. The spectra show strong polarization of a type different from conventional CIDEP spectra. The spectra have been analyzed and simulated by computing the eigenvalues and eigenvectors of the appro

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Atom-Transfer Addition, Cyclization, and Annulation, are carried out with a trialkyltin hydride reagent. However, the use of tin hydride is not always desirable (or possible), particularly when one or more slow steps are involved in a given sequence. The unique capability of iodine atom transfer reactions to control free radical sequences will be dis

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eustachian-tube

Radical Cations From Alkyl Iodides and 1,n-Halogen(Alkylthio)Alkanes in Solution,Radical cations of the general type (-I∴I-)., (=S∴I-)., (=S∴Br-)., and (=S∴S=). with optical absorptions in the UV/VIS are formed upon one-electron oxidation of alkyl iodides and 1 ,n-halogen(alkylthio)alkanes.

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Photo-Friedel-Crafts Reaction in Synthesis of Catharanthine and its Derivatives,Catharanthine la, allocatharanthine . and 2O-deethyl-catharanthine . were synthetised using a photochemical key step.

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Hydroxyl Radical-Induced Strand Break Formation in Single-Stranded Polynucleotides and Single-StranReproductive cell death and loss of biological activity caused by ionising radiation are currently believed to be the result of damage to DNA. Herewith strand breaks in the DNA backbone constitute a quite severe type of damage. Under conditions which favour the indirect effect, the strand breaks are formed predominantly by OH radicals.