Methods of synthesising stable 2-imidazoline nitroxides linked to a pyrazole moiety either directly or through a phenylethynylic bridge have been developed; an unusually strong temperature dependence of µeff for 2-(1-methylpyrazolyl-5)-4,4,5,5-tetramethyl-1-oxyl-2-imidazoline-3-oxide is observed.
S. F. Vasilevsky, E. V. Tretyakov, O. M. Usov, Y. N. Molin, S. V. Fokin, Y. G. Shwedenkov, V. N. Ikorskii, G. V. Romanenko, R. Z. Sagdeev and V. I. Ovcharenko, Mendeleev Commun., 1998, 8, 216 DOI: 10.1070/MC1998v008n06ABEH000997
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