| abstract |
THESE ARE COMPOUNDS OF FORMULA: (CF DRAWING IN BOPI) IN WHICH N1 OR 2, R REPRESENTS HYDROGEN, O, NO, A CYANOMETHYL, AN ALKYL, AN ALKENYL OR AN ALCYNYL, A BENZYL, AN ACYL OR A HYDROXYALKYL, R HYDROGEN, AN ALKYL OR PHENYL, R A GROUP (CF DRAWING IN BOPI) R HAVING THE SAME MEANING AS R, R IS A -COOR OR -CN GROUP AND R MAY HAVE VARIOUS MEANINGS AS FOLLOWING N1 OR 2 AND THAT R IS THE -CN GROUP. THESE COMPOUNDS STABILIZE ORGANIC MATERIALS AGAINST DEGRADATION CAUSED BY OXIDATION, HEAT AND LIGHT. |