Hoechst Aktiengesellschaft

Adolf Studeneer

Werner Knauf

Gerhard Salbeck

Ludwig Emmel

Werner Wellbrock

A process for the continuous production of C.sub.7 -Cl.sub.2 -acyloxybenzenesulfonic acids, wherein phenol and a sulfonating reagent, diluted with an aliphatic C.sub.7 -Cl.sub.2 -carboxylic acid, is charged to the top of a continuous-flow reactor heated to 80.degree.-100.degree. and the mixture of phenolsulfonic acid and the aliphatic carboxylic acid, leaving the bottom end of this continuous-flow reactor, and a chlorinating reagent are charged to the top of a second continuous-flow reactor, nitrogen being passed in counter-current through both continuous-flow reactors.

Continuous process for the production of acyloxybenzenesulfonic acids

Hydroxypyridine carbamates of the formula ##STR1## wherein R.sub.1 to R.sub.5 as defined below are valuable insecticides and particularly aphicides and Compounds of the formula ##STR2## wherein one of R'.sub.1 and/or R'.sub.3 are substituted carbamoyl and the other is preferably hydrogen or methyl, R'.sub.2 is a variety of substituents among which is hydrogen and acetyl, and R'.sub.3 and R'.sub.4 preferably form together a saturated or unsaturated C.sub.4 -chain which may be substituted, are valuable aphicides.

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Kelkheim, Germany

Adolf Studeneer