| abstract |
Compounds of formula I. wherein R 1 and R 2 independently of one another are C 1 -C 6 alkyl, unsubstituted or with C 1 -C 4 alkyl substituted C 3 -C 8 cycloalkyl, or unsubstituted or with F, Cl, Br, C 1 -C 6 -Alkyl, C 1 -C 6 -alkoxy or di (C 1 -C 6 -alkyl) amino-substituted phenyl or benzyl.n n n The compounds are useful as π acceptors and electrical semiconductors, and can be used to antistatic articles. |