N-([1,1'-biphenyl]-4-yl)-5,9,9-trimethyl-9H-fluoren-2-amine is formed by adding a methyl group to the structure of N-(biphenyl-4-yl)-9,9-dimethyl-9H-fluoren-2-amine. This compound can be used as an OLED intermediate in the preparation of compounds for organic optoelectronic devices.