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US 4,898,978 AGranted
Process for the preparation of N,N'-disubstituted guanidines
AssigneeAkzo N.V.
InventorsManfred Bergfeld, Ludwig Eisenhuth, Hans Zengel
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Abstract
A process for the preparation of aromatic N,N'-disubstituted guanidines is described in which the corresponding aromatic N,N'-disubstituted thioureas are reacted with ammonia and oxygen or with an oxygen-containing gas, in the presence of a solvent and elements acting as catalysts having atomic numbers 21 through 30 in the Periodic Table or the lanthanides or the salts, oxides or complexes thereof.
Claims11
A process for the preparation of an N,N'-disubstituted guanidine having the formula:
- ##STR6## wherein R.sub.1 and R.sub.2 may be the same or different and represent an unsubstituted or a mono- or polysubstituted aromatic group, said process comprising reacting a corresponding N,N'-disubstituted thiourea with ammonia and oxygen or an oxygen-containing gas, in the presence of a solvent and at least one catalyst selected from the group consisting of elements with atomic numbers 21 through 30 in the Periodic Table, lanthanides, and salts, oxides, and complexes thereof.
Dependencies are inferred from the claim text.