Dsm Chemie Linz Gmbh

Dsm Fine Chemicals Austria Gmbh

Wolfgang Huber

Franz Thomas Schwarz

Ferdinand Heu

Harald Poschko

Gunter Eichberger

Gerhard Burschik

Process for the preparation of 2-acetylcarboxylic esters by reacting an acetoacetic ester having 1 to 6 C atoms in the alkyl moiety with an aliphatic aldehyde having 1 to 12 C atoms at 0 to 40.degree. C. in the presence of a condensation catalyst, subsequently removing the water of reaction formed and unreacted starting materials and then hydrogenating the material at 20-160.degree. C., the temperature in the first hydrogenation phase being between 20 and 90.degree. C. and the temperature in the second phase being increased to 50 to 160.degree. C., depending on the starting temperature.

Process for the preparation of 2-acetylcarboxylic esters

Process for the preparation of pure 4,6-dichloropyrimidine by reaction of 4,6-dihydroxypyrimidine with an excess of phosphorus oxychloride at 20.degree. C. up to reflux temperature, in the presence of a trialkylamine as acid scavenger and catalyst.

Process for the preparation of pure 4,6-dihloropyrimidine

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Salzburg, Austria

Wolfgang Huber