| abstract |
Compounds of the formula I <IMAGE> (I) in which R1 and R2 independently of one another denote alkyl, cycloalkyl or aralkyl, R3 denotes hydrogen or, conjointly with R1, denotes tetramethylene, R4 denotes hydrogen or lower alkyl or, conjointly with R2, denotes tetramethylene, R5 denotes hydrogen, alkyl, aralkyl, acyloxyalkyl, oxaalkyl or phenyl, R6 denotes hydrogen, alkyl, phenyl or the group <IMAGE> or, conjointly with R5, denotes alkylene, R7 denotes hydrogen, alkyl, phenyl, benzyl or alkylphenyl or, conjointly with R5 or R6, denotes alkylene or, conjointly with R5 and R6, denotes alkanetriyl, R5, R6 and R7 together containing at least one carbon atom, Y denotes -O- or -NH-, P denotes 1, 2, 3 or 4 and A denotes hydrogen or a group which is derived from an organic or inorganic oxygen acid A-(OH)p, are suitable for stabilizing organic material against thermo-oxidative degradation. |