Experimental and Theoretical Studies of Fused-Ring Persistent [1,2,4]Thiadiazinyl Radicals
作者:Józef Zienkiewicz、Piotr Kaszynski、Victor G. Young
DOI:10.1021/jo0486746
日期:2004.10.1
Five persistent radicals la-le were generated by the oxidation of 4H-[1,2,4]thiadiazines 2a-2e and studied with ESR and UV-vis spectroscopy. Three of the radicals, 1a, 1d, and 1e, were generated in high yields (>90%) using either SO2Cl2/amine in toluene or AgO/K2CO3 in a toluene/MeCN mixture. Halogenated radicals 1d and le were sufficiently stable for chromatographic isolation and vacuum sublimation. The solution stability of the fluorinated 1d was measured at t(1/2) approximate to 4 months in the absence of oxygen, and le at t(1/2) approximate to 40 min in the presence of air. The crystal and molecular structures of 1d were determined by X-ray crystallography showing columns of parallel almost evenly spaced planar heterocycles connected by infinite ...N...S... chains. Cyclic voltammetry of 1d and le shows reversible reduction waves at about 0 V and irreversible oxidations at about 1.2 V. Spectral and electrochemical properties of 1 were well reproduced by DFT methods.
Molecular structure of 1-morpholino-3-phenyl-5,6,7,8-tetrachloro-1,2,4-benzothiadiazine
作者:Yu. G. Shermolovich、T. I. Malinovskii、A. A. Dvorkin、E. I. Kaminskaya、G. S. Borovikova
DOI:10.1007/bf00777213
日期:——
Shermolovich, Yu. G.; Simonov, Yu. A.; Dvorkin, A. A., Russian Journal of Organic Chemistry, 1989, vol. 25, # 3.2, p. 550 - 553
作者:Shermolovich, Yu. G.、Simonov, Yu. A.、Dvorkin, A. A.、Polumbrik, O. M.、Borovikova, G. S.、et al.