A cost-effective approach for 2-(t-butyl)-6-methyl-4H-pyrone - A key intermediate toward the synthesis of red-emitting dyes for OLED applications

In the interest of driving down the cost of DCM-type light emitting materials, we have found a new approach to prepare 2-(t-butyl)-6-methyl-4H-pyrone, which is cost effective and more amenable to large scale production than the reported method. Furthermore, three new DCM-type dyes, N,N-bis-[p-(2-(4-dicyanomethylene-6-t-butyl-4H-pyran-2-yl)-vinyl)-phenyl]-4-t-butyl-aniline (BDCM-BA), N,N-bis-[p-(2-(4-dicyanomethylene-6-t-butyl-4H-pyran-2-yl)-vinyl)-phenyl]aniline (BDCM-A) and N,N-bis-[p-(2-(4-dicyanomethylene-6-t-butyl-4H-pyran-2-yl)-vinyl)phenyl]-4-methoxyl-aniline (BDCM-MA) were synthesized in good yields using 2-(t-butyl)-6-methyl-4H-pyrone as starting material. They can be utilized in OLEDs as nondoped red emitting materials as the result of the restricted concentration quenching effect.Chemistry, MultidisciplinarySCI(E)0ARTICLE91137-11432