By A.J.Boulton A.R. Katritzky
(from preface)Volume 27 includes 4 contributions. Black and Doyle talk about '' l-Azabicyclo[3.1.0]hexanes and Analogs with additional Heteroatom Substitution.'' half II of the therapy of ''Heteroaromatic Radicals'' through Hanson offers with radicals with workforce VI heteroatoms and completes the assessment of the heteroaromatic loose radicals started in quantity 25. In ''The 1,2- and 1,3-Dithiolium Ions.'' Lozac'h and Stavaux elevate to this point the overview through Prinzbach and Futterer which seemed in 1966 in quantity 7 of this e-book. ultimately, Grimmett has up to date his personal assessment of im-idazole chemistry which seemed in 1970 in quantity 12.
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Additional info for Advances in Heterocyclic Chemistry, Vol. 27
Details of the ESR spectrum of 7 have been published in Russian with an indication that the radical, its thiophene counterpart, and the corresponding acetyl anion-radical exist as mixtures of rotamers. 7 4 Hyperfine splittings were reported to be solvent-dependent. 53 More recent work describes 7, generated by radiolytic means in aqueous medium. The hyperfine splittings reported (and given in structure 7 in gauss) are in good agreement with the earlier Soviet data for the same ~ o l v e n t . Greenstock ~ ~ .
Xanthenyl radical (38)itself is obtained in equilibrium concentrations when 9,9'-bixanthenyl is thermolyzed in suitable inert solvents. '67 The assignment of the splittings was made following specific deuteration experiments, and in the light of Hiickel and McLachlan calculations. Others have also performed calculations on xanthenyl r a d i ~ a l . , 39) have also been analyzed in detail by Sevilla and V i n ~ o w . 87 G, respectively, for the Me, Et and iPr groups; the P-splittings of alkyl groups other than Me were also found to be temperature-dependent.
Seppanen, J . Am. Chem. 89, 5740 (1967). 99 S. F. Nelsen, E. F. Travecedo, and E. D. Seppanen, J. Am. Chem. 93, 2913 (1971). l o o G. A. Russell, G. W. -Y. Chang, R. G. Keske, J. Mattox, C. S. C . Chung, K. Stanley, K. Schmitt, R. Blankespoor, and Y. Kosugi, J . Am. Chem. 96,7237 (1974). l o ' S. Arai, A. Kiva, and M. Imamura, J. Phys. Chem. 81, 110 (1977). R. E. Sioda and W. S. Koski, J. Am. Chem. Sac. 89, 475 (1967). ' 0 3 S. F. Nelsen, J. Am. Chem. Soc. 89, 5256 (1967). A. V. Il'yasov, Y. M.
Advances in Heterocyclic Chemistry, Vol. 27 by A.J.Boulton A.R. Katritzky