Process for preparing N,N-substituted carbamoyl halides

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United States of America Patent

PATENT NO 5380855
SERIAL NO

08192322

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Abstract

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A process for preparing N,N-substituted carbamoyl halides comprising (a) contacting carbon dioxide and a secondary amine in the presence of an aprotic organic solvent and a base selected from the group consisting of a phosphazene compound, an organic, nitrogenous base, mixtures of pyridine and a phosphazene compound or an organic, nitrogenous base, and mixtures thereof, to produce the corresponding ammonium carbamate salt, and (b) reacting the ammonium carbamate salt with a halide-containing electrophilic compound to produce the corresponding N,N-substituted carbamoyl halides. A second embodiment comprises recovering the ammonium carbamate salt of step (a) prior to reacting the ammonium carbamate salt with an halide-containing electrophilic compound in the presence of an aprotic organic solvent and a base selected from the group consisting of a phosphazene compound, an organic, nitrogenous base, mixtures of pyridine and a phosphazene compound or an organic, nitrogenous base, and mixtures thereof.

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Patent Owner(s)

Patent OwnerAddress
MONSANTO COMPANY800 N LINDBERGH ST LOUIS MO 63167

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
McGhee, William D Bridgeton, MO 28 93
Talley, John J St. Louis, MO 239 2635

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