Nitroxide radicals. Part XIII. Unpaired electron distribution in 1- and 2-naphthyl t-butyl nitroxides

Abstract

Nitrogen and proton coupling constants for a series of 1- and 2-naphthyl t-butyl nitroxides have been evaluated using both n.m.r. and e.s.r. techniques. McLachlan MO calculations on 2-naphthyl t-butyl nitroxide give values for the free spin densities on the ring positions which are in reasonably good agreement with those determined experimentally. Similar agreement for 1-naphthyl t-butyl nitroxide was not obtained.