Process for the preparation of asymmetrically substituted ureas

Prepn. of non-symmetric substd. ureas (I) effected by reacting a gaseous mixt. of isocyanic acid and NH3 at 250-600 deg.C with a prim. or sec. amine. The reaction is pref. effected by either (a) introducing 1-7 (esp. 1.1-3) equivs. of the amine (pref. at 320-380 deg.C) into a gaseous isocyanic acid/...

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Bibliographic Details
Main Authors STERN, GERHARD.DR, SCHULZ, ERICH, MUELLNER, MARTIN.DR
Format Patent
LanguageEnglish
French
German
Published 14.12.1994
Edition5
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
AMMONIA
CHEMISTRY
COMPOUNDS THEREOF
CYANOGEN
HETEROCYCLIC COMPOUNDS
INORGANIC CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:Prepn. of non-symmetric substd. ureas (I) effected by reacting a gaseous mixt. of isocyanic acid and NH3 at 250-600 deg.C with a prim. or sec. amine. The reaction is pref. effected by either (a) introducing 1-7 (esp. 1.1-3) equivs. of the amine (pref. at 320-380 deg.C) into a gaseous isocyanic acid/NH3 mixt. and then cooling (pref. using an inert diluent) to condense (I); or (b) introducing a gaseous unisocyanic acid/NH3 mixt. at 250-600 deg.C into a primary or sec. amine which is in the liq. or molten state or in an inert diluent and then isolating (I) from the mixt.
Bibliography:Application Number: EP19900112742