Bayer Aktiengesellschaft

Andreas Sattler

Bernd Griehsel

Guido Steffan

Nikolaus Muller

Johannes-Rudolf Jansen

Lutz Heuer

Karsten Von Dem Bruch

Klaus-Peter Heise

Martin Hoch

G&uuml;nter Rauchschwalbe

Thomas Essert

Jurgen Schneider

Johannes Kanellakopoulos

Method for the production of 2,6-dichloro-5-fluoro-nicotinic acid and coarse and particularly pure 2,6-dichloro-5-fluoro-nicotinic acid

The process according to the invention can be illustrated by way of example by the following equation:

Method for the production of 2,6-dichloro-5-fluoronicotinonitrile and the chemical compound 3-cyano-2-hydroxy-5-fluoropyride-6-one-monosodium salt its tautomers

Catalyst system for the production of olefin (co)polymers

1-alkyl-pyrazole-5-carboxylic acid esters are prepared by reacting the enolate of a 2,4-diketocarboxylic acid ester with an N-alkylhydrazinium salt in the presence of a solvent. This process allows a particularly economic preparation of 1-alkyl-pyrazole-5-carboxylic acid esters in a simple manner and with only little formation of undesirable isomers.

Process for the preparation of 1-alkyl-pyrazole-5-carboxylic acid esters

Cyclopropanecarboxylic acid amides ##STR1## wherein R represents hydrogen, straight-chain or branched C.sub.1 -C.sub.4 -Alkyl, optionally substituted aryl or optionally substituted aralkyl, can be prepared directly from the corresponding cyclopropanecarboxylic acid by reaction with ammonia under pressure in a suitable organic solvent.

Process for the preparation of cyclopropanecarboxylic acid amides

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Wermelskirchen, Germany

Andreas Sattler