Process for the preparation of alkanesulfonylbenzoic acids
AssigneeHoechst Aktiengesellschaft
InventorFreimund Rohrscheid
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Abstract
A process for the preparation of alkanesulfonylbenzoic acids from alkanesulfonylalkylbenzenes of the formula ##STR1## in which R.sup.1 and R.sup.2 are identical or different and are alkyl having 1 to 4 carbon atoms, but R.sup.2 has a meaning other than t-butyl, and X is H, F, Cl, Br or NO.sub.2, using molecular oxygen in acetic acid and/or propionic acid in the presence of a catalyst containing cobalt and bromine ions and, in particular when the meaning of R.sup.2 is other than methyl, also manganese ions, which is additionally carried out in the presence of metal ions of Main Group 2 and/or 3.
Claims20
A process for the preparation of alkanesulfonylbenzoic acids from alkanesulfonylalkylbenzenes of the formula ##STR2## in which R.sup.1 and R.sup.4 are identical or different and are alkyl having 1 to 4 carbon atoms, but R.sup.2 has a meaning other than t-butyl, and X is H, F, Cl, Br or NO.sub.2, using molecular oxygen in acetic acid and/or propionic acid in the presence of a catalyst containing cobalt and bromine ions and, optionally also manganese ions, which is additionally carried out in the presence of metal ions of Main Group 2 and/or 3.
The process as claimed in claim wherein magnesium, calcium, strontium, barium or aluminum ions, are employed as metal ions of Main Group 2 and/or 3.
The process as claimed in claim
- wherein the oxygen partial pressure in the reactor is 1.5 to 8, bar.
A process for the preparation of an alkanesulfonylbenzoic acid from an alkanesulfonylalkybenzene, which process comprises:
- oxidizing an alkanesulfonylalkylbenzene of the formula I ##STR3## in which R.sup.1 and R.sup.2 are identical or different and are alkyl having 1 to 4 carbon atoms, but R.sup.2, the group which is oxidized, has a meaning other, than t-butyl, and X is H, F, Cl, Br or NO.sub.2, with molecular oxygen in acetic acid or propionic acid or mixtures thereof in the presence of a catalyst containing cobalt ions and bromine ions and which further contains a metal ion of Main Group 2 or Main Group 3 or a combination of ions from Main Groups 2 and 3.
Dependencies are inferred from the claim text.