摘要:
$2-DIHYDRO- AND IMIDAZOLINE HAVING DISUBSTITUTION IN BOTH THE 4 AND 5 POSITIONS OF THE RING, WHEREIN BOTH THE NITROGEN ATOMS IN THE RING ARE BONDED TO OXYGEN. SUB STITUTED AT THE TWO POSITION ARE HALOGEN, OXY AND OXO GROUPS. PREFERRED COMPOUNDS HAVE A NITROXIDE FUNCTIONALITY IN CONJUGATION WITH A NITRONYL FUNCTIONALITY.
摘要:
MONO AND POLY-4,4,5,5-TETRASUBSTITUTED-1,3,-DIAZOLES ARE PROVIDED HAVING AT LEAST ONE NITROGEN ATOMS BONDED TO AN OXYGEN ATOM. THE DIAZOLES ARE PROVIDED IN VARYING STATES OF OXIDATION. PARTICULARLY DESIRABLE COMPOUNDS ARE THOSE IN WHICH ONE OF THE OXIDANTS IS PRESENT AS A FREE RADICAL, THE COMPOUND BEING AN EXTREMELY STABLE FREE RADICAL AND USEFUL FOR SPIN LABELING, OXIDATION INHIBITION, AND FREE RADICAL CHAIN TERMINATION, FOR EXAMPLE, IN POLYMERIZATIONS. BY VIRTUE OF THE EXCELLENT STABILITY OF THE FREE RADICALS, THE FREE RADICAL COMPOUNDS CAN ALSO BE USED AS STANDARDS FOR CALIBRATION OF ELECTRON SPIN RESONANCE SPECTROMETERS.