Konfiguration und konformation von methyl- und aminylradikalen mit CF3S-substituenten

From the hyperfine ESR-splitting patterns of, $\text{a(}{}^{13}\text{C}{}_{\mathrm{\gamma }}\text{), a(}{}^{14}\text{N}\text{)}\text{and}\text{a(}{}^{19}\text{F}\text{)}$ it is concluded that the radicals (CF₃S)₃C·, (CF₃S)₂HC·, (CF₃S)H₂C·, (CF₃S)₂N· and (CF₃S)₃Si· are planar π-radicals existing in a nearly fully staggered conformation. The force which promotes the staggered conformation arises from conjugative delocalization between the 2 p_z-unpaired electron and the p-type lone pair on the sulfur atoms of the CF₃S-groups, causing a stabilization of the radicals. The electronegative CF₃-group decreases the extent of conjugative electron delocalization.Whereas fluorine atoms adopt equivalent positions in the radicals the staggered conformation implies inequivalence of the protons in CF₃SCH₂.