T. Kondow, Koshi Okazaki, Y. Katsuhara
Sep 1, 1982
Citations
0
Influential Citations
1
Citations
Journal
Journal of Fluorine Chemistry
Abstract
Abstract Benzaldehydes having trifluoromethyl group (1) were known to be prepared by hydrolysis of the corresponding benzal chlorides ( 2 ) with conc. sulfuric acid. However, this method is not favorable for the synthesis of 1 because of the formation of tary materials and the complexity of the reaction process. In order to overcome these disadvantages, vapor hydrolysis of 2 was investigated in the presence of solid acid catalysts. Metal oxides such as γ - Al 2 O 3 and TiO 2 gave 1 but their lives of catalytic activities were not satisfactory. While activated carbon soaked in conc. sulfuric acid yielded 1 with a little amount of phthalic acids, metal chlorides supported on activated carbon gave 1 without hydrolysis of the trifluoromethyl group. Metal chlorides such as Fe(III), Mn(II) and Co(II) were the most effective in these reactions.