Process for producing aryl carbamates
AssigneeUbe Industries, Ltd.
InventorsKatsumasa Harada, Ryoji Sugise, Kohichi Kashiwagi, Tsunao Matsuura
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Abstract
A process for producing an aryl carbamate of a high purity at a high yield by reacting a diaryl carbonate with an amine compound having one or more hydrogen atoms bonded to the N position in the presence of carboxylic acid(s) of the following general formulae (I): R.sup.1 --COOH and/or (II): R.sup.2 --COOH (wherein R.sup.1 represents an alkyl or cycloalkyl group having an .alpha.-positioned carbon atom bonded to only one hydrogen atom, an alkyl group having an .alpha.-positioned carbon atom bonded to no hydrogen atom, or an aryl or heterocyclic group, and R.sup.2 represents an alkyl group having an .alpha.-positioned carbon atom bonded to two or more hydrogen atoms).
Claims17
A process for producing an aryl carbamate comprising reacting a diaryl carbonate with an amine compound having at least one hydrogen atom located at an N-position in the presence of at least one carboxylic acid of the formula (I):
- R.sup.1 --COOH (I)
- in which R.sup.1 is a member selected from the group consisting of (1) C.sub.3 -C.sub.15 alkyl groups having an .alpha.-positioned carbon atom bonded to the --COOH group and to only one hydrogen atom and C.sub.5 -C.sub.15 cycloalkyl groups having an .alpha.-positioned carbon atom bonded to the --COOH group and to only one hydrogen atom, (2) C.sub.4 -C.sub.16 alkyl groups which may include a cycloalkyl structure, having an .alpha.-positioned carbon atom bonded to the --COOH group and to no hydrogen atom, (3) C.sub.6 -C.sub.16 aryl groups, and (4) C.sub.4 -C.sub.15 heterocyclic groups.
Dependencies are inferred from the claim text.