The present invention provides compounds of formula (I) wherein X is O, S or NR10, wherein R10 is H, C1-30-alkyl, substituted C1-30-alkyl, C2-30-alkenyl, substituted C2-30-alkenyl, C2-30-alkynyl, substituted C2-30-alkynyl or C(0)-OR11, R1 and R11 are independently from each other selected from the group consisting of C1-30-alkyl, substituted C1-30-alkyl, C2-30-alkenyl, substituted C2-30-alkenyl, C2-30-alkynyl, substituted C2-30-alkynyl, C5-8-cycloalkyl, substituted C5-8-cycloalkyl, C5-8-cycloalkenyl, and substituted C5-8-cycloalkenyl, and an electronic device comprising the compounds as semiconducting material.