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US 4,230,876 AGranted
Process for the preparation of urethanes
AssigneeBayer Aktiengesellschaft
InventorsHans-Joachim Scholl, Armin Zenner
Life of this patent
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Abstract
The instant invention relates to an improved process for the preparation of urethanes by the reaction of aromatic nitro compounds with alcohols and carbon monoxide in the presence of catalyst systems which contain selenium.
Claims6
In a process for the preparation of urethanes by the reaction of aromatic nitro compounds with aliphatic, cycloaliphatic or araliphatic alcohols and carbon monoxide in the presence of a catalyst system, the improvement wherein said reaction is conducted in the absence of carboxylic acids and phenols and said catalyst system comprises (1) selenium or a selenium compound;
- (2) a bicyclic amidine;
- and (3) an aromatic amino and/or aromatic urea compound.
Dependencies are inferred from the claim text.