Bayer Aktiengesellschaft

Frank Arndt

Alexander Klausener

Rudolf Wiemers

Hans-Josef Buysch

Helmut Fiege

Uwe Claussen

Horst Harnisch

Horst Behre

Carl-Wolfgang Schellhammer

Wolfgang Eymann

Lutz Frohn

Hanspeter Baumgartner

N-Phenyl-1-naphthylamine can be prepared by reaction of aniline and 1-naphthylamine in the liquid phase at 100-400.degree. C. under normal pressure, a catalyst mixture comprising boron and fluorine being employed. Such catalyst mixtures can be obtained, for example, by reaction of hydrogen fluoride, boric acid and aniline and/or 1-naphthylamine. The catalyst is recovered and can be employed again. The reaction can be carried out discontinuously or continuously.

Preparation of N-phenyl-1-naphthylamine

N-phenyl-1-naphthylamine can be prepared by reacting aniline and 1-naphthylamine in the liquid phase at 100-400.degree. C. at a reaction pressure which is higher than atmospheric pressure. Boron and fluorine-containing catalysts, mono or polysulfonic acids, iodine, PCl.sub.3, PCl.sub.5, or POCl.sub.3, for example, may be used as catalysts.

Aminobiphenyl (ABP) can be separated off from diphenylamine (DPA) by treating the DPA to be purified at elevated temperature with a substance in which oxygen is bonded by a double bond to a C atom, an N atom or another O atom and then separating off the DPA from the treated mixture.

Process for separating off aminobiphenyl from diphenylamine

Light-collecting system, characterized in that it contains a coumarin derivative of the formula ##STR1## in which T designates O or NR.sub.4, wherein R.sub.4 represents hydrogen, optionally substituted alkyl or optionally substituted aryl;

Light-collecting systems and the use of coumarin derivatives as energy

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Krefeld, Germany

Frank Arndt