Bayer Aktiengesellschaft

Alfredo Wust

Tony Van Osselaer

Knut Hammerstrom

Benzothiazole sulphene amides are obtained from dibenzothiazolyl disulphide and water-soluble amines in the absence of an oxidizing agent and in the presence of aqueous alkali in a high yield and with very good stability in storage by placing the amine solution in water and simultaneously adding dibenzothiazolyl disulphide and aqueous alkali from separate storage vessels.

Process for the production of benzothiazole sulphene amides

Benzothiazolesulphenamides can be prepared in high yield and purity from dibenzothiazolyl disulphide and a primary or secondary amine in the absence of an oxidizing agent in a water-immiscible organic solvent and in the presence of aqueous alkali by presenting a solution of the amine in the organic solvent and adding dibenzothiazolyl disulphide and aqueous alkali either simultaneously or in succession.

Process for preparing benzothiazolesulphenamides

2,2'-dibenzothiazolyl disulphide produced from an alkali metal salt of 2-mercaptobenzothiazole by oxidation using chlorine is obtained substantially free from acid by-products if oxidation is carried out under such conditions that the reaction mixture still contains at least 2.5%, by weight, of the alkali metal salt of 2-mercaptobenzothiazole at the end of the reaction.

Process for the production of 2,2'-dibenzothiazolyl disulphide

A process for separating phenol from a mixture of the same with cresol which comprises including in the mixture a component which has a dipole moment of 0 to 0.5 Debye and has a boiling point, under 1 bar, in the temperature range from 120.degree. to 220.degree. C. or which has a dipole moment of 0.5 to 2.5 Debyes and has a boiling point, under 1 bar, in the temperature range from 150.degree. to 190.degree. C. and distilling off phenol together with said component to leave behind said cresol.

Growing community of inventors

Roesrath, Germany

Alfredo Wust