Abstract

In this paper, different mechanochemical methods for production of 1, 1´-Bi-2-naphthol from oxidative coupling 2-naphthol in presence of FeCl₃ were compared. The first were designed and a vibration mill as a new device for this reaction was manufactured. Our results were compared to the works of Toda et al. (1989) and Rasmussen et al. (1997) who reported other mechanochemical systems. It was found that our proposed method has a higher yielding with low reaction time. In our proposed device, there is a possibility to change the vibration frequency from 0 to 4000 rpm and the results of the effect of different frequencies on reaction progress were presented accordingly. This method was developed for the oxidative coupling of other phenols such as anthrone and 2,3-dihydroxy-1,4-naphthylene.   

Key words: 1,1´-Bi-2-naphthol production, oxidative coupling of phenols, mechanochemical reaction, vibration mill.