| abstract |
Compounds of the formula <IMAGE> (I) and of the formula <IMAGE> (II) in which X and X' are, for example, -S-CHR1, -NR2R3, -S-R3, -NR2R3 or -OR3, R1 is, for example, -H, alkyl, cycloalkyl or phenyl, R2 and R3 are, for example, -H, alkyl, cycloalkyl or phenyl, or R2 and R3 together form a 3- to 7-membered heterocyclic ring, and R is alkylene, and compositions containing at least one compound of the formulae I and/or II and at least one lubricant, one hydraulic fluid or one metal working fluid, the compounds of the formula I and/or II being used as extreme pressure and wear-reducing additives. |