NMR DETERMINATION OF EPR HYPERFINE COUPLING-CONSTANTS OF SOME 5-(N-ALKYL)-1,1,3,3-TETRAKIS(TRIDEUTERIOMETHYL)ISOINDOLIN-2-YLOXYLS

2D H-1-C-13 chemical shift correlation spectroscopy has been used to determine some small H-1 and C-13 EPR hyperfine interaction constants in some 5-(n-alkyl)isoindolin-2-yloxyl radicals. In the methodology used, it was necessary to measure the chemical shifts of both the isoindolines and of the cognate isoindolin-2-yloxyl radicals. The latter n-alkyl-substituted radicals have considerable potential as EPR spin probes in lipid systems.