| 摘要 |
PURPOSE:To obtain an aromatic dicarboxylic acid in high purity and yield by oxidizing an aromatic dialkyl compound with oxygen or an oxygen-contg. gas in the presence of a specific catalytic system. CONSTITUTION:The objective aromatic dicarboxylic acid of formula VII can be obtained by oxidizing (I) a compound of formula I [R<1> and R<2> are each alkyl; A is of formula II-VI (m and n are each 0-4); X, Y<1>, Y<2> and Z are each halogen, NO2 or CN] with (II) oxygen or an oxygen-contg. gas (industrially, air is optimal) in (III) a 2-10C aliphatic monocarboxylic acid (pref. acetic acid) in the presence of (IV) a catalyst composed of (A) cobalt, (B) bromine or bromine plus chlorine, and (C) at least one kind selected from manganese, cerium, zirconium and nickel (e.g. cobalt bromide-manganese acetate, cobalt naphthenate- manganese naphthenate-tetrabromoethane). |
