Acetoacetarylamides
AssigneeLonza Ltd.
InventorsBernard Balmer, Sven Hafkesbrink, Max Lauwiner
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Abstract
Novel acetoacetarylamides in the form of a solidified melt which are in a form which can be used in industry and is easy to handle and which has a water content of from 3 to 15 percent by weight. These novel acetoacetarylamides have been used for the preparation of colored pigments or agrochemical active ingredients.
Claims20
An acetoacetarylamide defined by the formula:
- in which R is hydrogen or at least one substituent from the series alkyl, alkoxy or halogen, as a solidified melt in a form which can be used in industry and is easy to handle, which has a water content between 3 and 15 percent by weight.
A process for the preparation of an acetoacetarylide by the reaction of diketene and corresponding aromatic amine in the presence of an aqueous mother liquor, at least 80 percent by weight of which is water, characterized in that the diketene and the aromatic amine are metered into a tubular reactor simultaneously to recirculated mother liquor such that the reaction temperature is maintained at from 50° to 100° C., the mother liquor is separated off after the reaction at the given temperature of from 50° to 100° C. and returned to the tubular reactor, and the resulting acetoacetanilide melt, which has a temperature of from 50° to 100° C., is cooled and converted into the form which can be used in industry and is easy to handle.
Dependencies are inferred from the claim text.