G. Cordier
1988
Citations
0
Influential Citations
4
Citations
Journal
Studies in Surface Science and Catalysis
Abstract
Abstract Very good yields (≥ 95%) in 3.5 Dichloraniline or in 3.5 Dichlorophenol are obtained by selective hydrodechlorination in liquid phase with Pd / Charcoal as catalyst and tri, tetra or pentahalogenated compounds as starting materials. This selective hydrodechlorination in 2 and 4 positions(in relation with NH 2 or OH group) is effective in aqueous acidic medium containing HC1 and traces of ions such as I − , Br − , Sn 2+ , Ag + , Bi 3+ , Pb 2+ , Hg + , Tl + . It is also effective in an organic medium (chlorobenzenes as solvent) containing HC1 and a Lewis acid like AICI 3 , Znl 2 , SnCl 2 . Selective hydrodechlorination of polychlorophenols needs a Lewis acid and HC1; while selective hydrodechlorination of polychloranilines does not need absolutely Lewis acid. We admit that only protonated forms of polychloroaniline or phenol are chemisorbed and selectively hydrodechlorinated in positions 2 and 4.