Free Radicals in Synthesis and Biology by H. G. Viehe, Z. Janousek, R. Merényi (auth.), Francesco

By H. G. Viehe, Z. Janousek, R. Merényi (auth.), Francesco Minisci (eds.)

Free-radical reactions were for very long time the area of the actual chemists and the fundamental chemical (polymerization of vinyl monomers, oxidation through molecular oxygen, chlorination of methane etc.), the place using easy molecules and the opportunity of partial conversions with out heavy difficulties of product separations makes much less dramatic the features of regio and chemoselectivity. As synonym of unselectivity, loose radical reactions have been thought of of bad use within the synthesis of excellent chemical substances or subtle molecules, the place a excessive selectivity is a necessary situation for the luck, or within the involvement of organic tactics. in the final 15 years, besides the fact that, an genuine explosion of artificial purposes of loose radical reactions happened; they've got received a extraordinary place one of the selective equipment of synthesis. even as the nice value of loose radical reactions in basic organic techniques and within the metabolism of gear has been well-known. therefore a really good assembly on those subject matters was once commonly felt applicable. I had the respect and the onus to arrange this workshop simply because for greater than 30 years i've been concerned with the learn of unfastened radical reactions. due to a beneficiant supply from NATO clinical Affairs department and the monetary aid of CNR and chemical (Montedison, Enichem, Zambon) this kind of assembly between nearly 50 experts and 15 observers of enough commonplace to exploit the dialogue, grew to become attainable at Bardolino (Italy).

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D. Beckhaus and C. RUchardt* Institut fUr Organische Chemie und Biochemie der Universitat Freiburg, Albertstr. 21, D-7800 Freiburg,FRG K. -G. v. Schnering Max-Planck-Institut fUr Festkorperforschung, Heisenbergstr. 1, D-7000 Stuttgart 80, FRG ABSTRACT The thermodynamic stabilisation of radicals by captodative substitution is little influenced by the polarity of solvents. 2-diphenyl-succinonitrile is due to the anomeric effect of gem-dialkoxy substitution and not to synergetic stabilisation of captodative substituted radical centers.

Thesis, Louvain-la-Neuve (1988). A. Arbusov, A. Markovskaya, Izv. Akad. Nauk. , Khirn. A. 47, 33168 (1953). K. Iida, Y. Watanabe, C. Kibayashi, J. Org. Chern. 50, 1818 (1981). D. Ranganathan, S. B. Rao, K. Rarnan~Tetrahedron 37, 629 (1981). G. L. Vaerrnan, J. Prakt. , submitted. R. Sustrnann, unpublished results. For a review see M. Balci, Cbern. Rev. 81, 91 (1981). H. Felber, G. Kresze, R. Prewo, A. Vasella, Helv. Chirn. Acta 69, 1137 (1986). W. Burger, Ph. Work, Munich and Louvain-la-Neuve, in preparation.

8 kcal/mol) from ESRexperiments is believed to be more reliable than the enthalpy of activation 10 ) which was obtained by a special nmr-technique 10 ). While the introduction of the first pair of cyano groups results in a decrease in IJ H# by lO kcal/mol (cf. no. 1 and 5) the second pair of cyano,s decreases the bond energy even more (by - 15 kcal/mol). These results clearly show that a comparison of the reactivity of capto-capto, captodative and dativedative substituted model compounds must not rely on the differences in resonance stabilisation of the various types of radicals alone.

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