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US 4,289,906 AGranted
Chemical process for preparing methylene bis-anilines
AssigneeEthyl Corporation
InventorKju H. Shin
Life of this patent
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Abstract
Aromatic amine hydrochloride having an unsubstituted ortho or para position reacts with dimethylsulfoxide forming methylenebis aromatic amine.
Claims7
A process for making a methylenebisaniline, said process comprising reacting an aromatic amine having an unsubstituted ortho or para position with hydrogen chloride and dimethylsulfoxide.
Dependencies are inferred from the claim text.