| abstract |
Two alkyl substituents at the 9-position of the fluorene ring are generally represented by the following formula: wherein X is an adjacent methylene group, which is the 9-position of the fluorene ring system and A method for producing an OLED material comprising a fluorene ring system that is alkyl-substituted via a primary intermediate (representing a substituent that increases the acidity of a hydrogen atom on a methylene group directly adjacent). |