Basf Aktiengesellschaft

Hubert Lendle

Wolfgang Hoelderich

Peter Stops

Klaus-Dieter Malsch

Wilfried Seyfert

Rolf Hartmuth Fischer

Wolfgang Richter

Peter Magnussen

Gerhard Frank

Paul Panitz

Jost H Manegold

Hans Leitner

Wolfgang Leitenberger

Carboxylic esters obtained by reacting olefinically unsaturated compounds with carbon monoxide and alcohols and containing aldehydes, acetals and/or unsaturated compounds are purified by

Purification of carboxylic esters which contain aldehydes, acetals

Pyridine or methylpyridines or mixtures thereof are recovered from methyl butanedicarboxylate containing reaction mixtures obtained by reaction of methyl pentenoate with carbon monoxide and methanol in the presence of pyridine, methylpyridines or mixtures thereof and also cobalt catalysts at elevated temperatures and under superatmospheric pressure and subsequent treatment with molecular oxygen containing gases in aqueous acetic acid by

Recovery of pyridine or methylpyridines or mixtures thereof from methyl

4-Pentenoates are prepared by isomerization by a process in which isomeric pentenoates are treated with a zeolite of the pentasil type at from 50.degree. to 300.degree. C., and the 4-pentenoate is distilled off from the reaction mixture.

Preparation of 4-pentenoates

4-Pentenoates are prepared by isomerization by a process in which isomeric pentenoates are treated at elevated temperatures in the presence of a zeolite containing metals of group eight of the Periodic Table and the 4-pentenoate is distilled off from the reaction mixture, and the zeolite contains iron, cobalt and/or nickel.

Aliphatic dinitriles are prepared by reacting aliphatic dicarboxylic acids with ammonia in excess at from 200.degree. to 500.degree. C. in the presence of zeolites as catalysts.

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Ludwigshafen, Germany

Hubert Lendle