Dsm Chemie Linz Gmbh

Chemie Linz Gmbh

Franz Thomas Schwarz

Johann Altreiter

Franz Mostl

Ferdinand Heu

Wolfgang Huber

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

A process for the transesterification of dimethyl succinylsuccinate with one or more aliphatic alcohols which in each case have at least 2 C atoms, in the presence of an acidic catalyst and in the presence or absence of a diluent which is inert under the reaction conditions, with exclusion of oxygen and under pressure, at least one of the two methoxy groups being replaced by the oxy group corresponding to the alcohol used and use of the process in a process for the preparation of terephthalic acids and of quinacridones.

Process for the production of 2,5-dianilino-terephthalic acids

A process for the transesterification of dimethyl succinylsuccinate with one or more aliphatic alcohols which in each case have at least 2 C atoms, in the presence of an acidic catalyst and in the presence or absence of a diluent which is inert under the reaction conditions, with exclusion of oxygen and under pressure, at least one of the two methoxy groups being replaced by the oxy group corresponding to the alcohol used.

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Wolfern, Austria

Franz Thomas Schwarz