Efficient Synthesis of Arylated Carbazole from Cyclopentadienyliron Complexes

Arylated carbazoles are valuable intermediates in the preparation of organic functional materials. The present work addresses an improved process for the preparation of arylated carbazoles. This process involves a nucleophilic substitution between the cyclopentadienyliron complexes of chloroarenes and carbazole or hydroxyl carbazole, followed by photolysis of cyclopentadienyliron complexes of arylated carbazoles (Fc-carbazole). The described process combines two steps in good yields and is cost-effective, and thus, it is a practical route of preparation of arylated carbazoles. The purification strategy of arylated carbazoles was subjected to crystallization instead of column chromatography, which is very good for their industrial applications. The arylated carbazoles products were determined by Fourier transform infrared (FT-IR), liquid chromatography mass spectroscopy (LC-MS), and NMR.