The invention describes a composition comprising a) an organic material which is susceptible to oxidative, thermal or light-induced degradation, and b) at least a compound of the formula (I) wherein Q is a direct bond (II), R
1
is C
1
-C
100
alkyl, C
2
-C
100
alkenyl, C
3
-C
12
cycloalkyl or C
3
-C
12
cycloalkyl substituted by 1 to 5 C
1
-C
4
alkyl; R
2
is a fluorine containing group, and R
3
and R
4
independently of each other are hydrogen or C
1
-C
4
alkyl. The compounds of the formula (I) are useful as reducers of surface energy for organic materials, for example, for increasing the oil and water repellency of organic materials.