Bayer Aktiengesellschaft

Gunter Silber

Heinz U Blank

Erich Wolters

Gerhard Marzolph

Gerold Schade

Friedrich-Wilhelm Ullrich

Halmut Kraus

Udo Thiel

Sodium salts of aromatic sulphinic acids containing nitro groups are obtained in particularly pure form and good yield by introducing the corresponding sulphonyl chlorides into an aqueous alkali metal sulphite solution which is at a temperature of -10.degree. to 45.degree. C. and has a pH of 6 to 10, then cooling the suspension to -10.degree. to 0.degree. C., then metering in sodium hydroxide solution in such a way that the temperature does not exceed 0.degree. C. throughout the reaction, and then raising the temperature, maintaining stirring and simultaneously keeping the pH at 8 to 9 by the addition of sodium hydroxide solution.

Process for the preparation of sodium salts of aromatic sulphinic acids

.beta.-Amino-acrylic acid esters of the formula

Process for the preparation of .mu.-amino-acrylic acid esters

Optionally substituted 2-benzyl-toluenes can be prepared by reaction of optionally substituted 2-benzyl-tert.-alkyl-toluenes with an optionally substituted aromatic hydrocarbon in the presence of anhydrous iron-(III) halide. The reaction is carried out at ambient to elevated temperature. The optionally substituted aromatic hydrocarbon is employed in molar excess, relative to the 2-benzly-tert.-alkyl-toluenes.

Process for the preparation of optionally substituted 2-benzyl-toluenes

Growing community of inventors

Cologne, Germany

Gunter Silber