Di-, tri- and tetraphenylindane derivates and their use in organic electronics

A compound of the general formula (I)

• and mixtures thereof,
• wherein
• RA is C1-C6-alkyl;
• RB is C1-C6-alkyl, C3-C8-cycloalkyl or a group of the formula (RB-I)
• # denotes the bonding site to the remainder of the molecule;
• X is -A-(NAr2), wherein
• A is independently on each occurrence a chemical bond or phenylene which is unsubstituted or substituted by 1, 2, 3 or 4 substituents independently selected from the group consisting of C1-C6 alkyl and C1-C6-alkoxy;
• Ar is independently on each occurrence selected from in each case unsubstituted or substituted aryl, wherein two groups Ar bound to the same nitrogen atom may together with the nitrogen atom also form a fused ring system having 3 or more than 3 unsubstituted or substituted rings;
• Y is independently on each occurrence selected from hydrogen, C1-C6-alkyl, C1-C6-alkoxy, C3-C8-cycloalkyl, C3-C8-cycloalkoxy, phenyl and phenoxy, wherein each of the cyclic rings in the four last-mentioned groups are unsubstituted or substituted by 1, 2 or 3 C1-C6-alkyl groups;
• k is 0, 1 or 2;
• 1 is 0, 1 or 2;
• m is 0, 1 or 2;
• n is 0, 1 or 2;
• with the proviso that the sum of k, l, m, and n is 1, 2, 3 or 4;
• p is 2, 3 or 4, wherein 0, 1, 2, 3 or 4 of the p Y groups are different from hydrogen;
• q is 3, 4 or 5, wherein 0, 1, 2, 3, 4 or 5 of the q Y groups are different from hydrogen;
• r is 3, 4 or 5, wherein 0, 1, 2, 3, 4 or 5 of the r Y groups are different from hydrogen;
• s is 3, 4 or 5, wherein 0, 1, 2, 3, 4 or 5 of the s Y groups are different from hydrogen;
• the sum of k and p is 4;
• and the sum of q and l is 5, the sum of m and r is 5, and the sum of s and n is 5.