Process for the preparation of cinnamic acid derivatives
AssigneeBayer Aktiengesellschaft
InventorsDieter Kaufmann, Carsten Hesse, Thomas Himmler
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Abstract
Cinnamic acid derivatives, in particular 2-ethylhexyl p-methoxycinnamate and 2-isoamyl p-methoxycinnamate, are prepared avoiding particular effort for workplace hygiene and ecology by using bromoaromatic and acrylic acid derivatives in the presence of palladium catalysts and a large excess of phosphane (based on the palladium), in the presence of an inorganic base and in the presence of alcohols and/or a phase transfer catalyst.
Claims10
Process for the preparation of cinnamic acid derivatives from bromoaromatics and acrylic acid derivatives in the presence of palladium catalysts and a phosphane, characterised in that it is carried out in the presence of an inorganic base, a large excess (based on the palladium) of phosphane, and alcohols and/or a phase transfer catalyst.
Dependencies are inferred from the claim text.