| 摘要 |
Lubricants can be rendered more resistant to oxidation with the aid of compounds of the formula I <IMAGE> (I) wherein R1 and R2 are independently hydrogen, alkyl or benzyl, R'2 is hydrogen or alkyl, R3 and R4 are independently alkyl, phenyl or benzyl, R5 is hydrogen or alkyl, and R6 is alkyl. In a preferred embodiment, these compounds are combined with a customary phenolic antioxidant.
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