Bayer Aktiengesellschaft

Rudolf Helm

Kuno Wagner

Hanns P Muller

Helmut Fiege

Karlfried Wedemeyer

Roland Richter

Ferdinand Hagedorn

Jurgen Zander

Robert So/ Llner

2,2'-Dinitrodiphenyl disulphide is obtained in particularly good yields and purities in a simple manner by reacting 2-chloronitrobenzene with an aqueous alkali metal disulphide solution in the presence of phase transfer catalysts and an organic solvent.

Process for preparing 2,2'-dinitrodiphenyl disulphide

A process for preparing a mixture of polyhydroxyl compounds having low molecular weight by catalytically hydrogenating a formose mixture with hydrogen on a metal catalyst. The hydrogenation is carried out at a pH of 7.5 to 12.5 and at elevated temperature and pressure. The formose mixture comprises (i) up to 70 wt. % formose, (ii) up to 1.6 wt. % lead ions and (iii) up to 5 wt. % calcium ions with at least one of (ii) or (iii) being present. The catalyst which is present in an amount of 4-240 wt. % (based on formose solution) is a compound taken from the group consisting of nickel, cobalt and compounds thereof. The mixture of polyhydroxyl compounds made in accordance with the present invention is useful as a starting material in the production of polyether polyols, polyester polyols and polyurethane plastics.

Process for the preparation of a mixture of low-molecular weight

Object of the invention is a process for the production of 4-nitroso diphenylamine wherein N-nitroso diphenylamine is rearranged in the presence of an alcoholic hydrogen chloride solution by selecting the reaction conditions in such a way that the hydrochloride of 4-nitroso diphenylamine remains dissolved in the reaction medium. In this way spontaneous, uncontrollable decompositions do not occur.

Process for the production of 4-nitroso-diphenylamine

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Bergisch Gladbach, Germany

Rudolf Helm