USE OF POLYPHOSPHORIC ACID AS A REACTION MEDIUM FOR THE PREPARATION OF UNSYMMETRICAL DIARYLAMINES FROM SUBSTITUTED PHENOLS AND PRIMARY AROMATIC AMINES
Original Publication Date: 1982-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
A process for the preparation of unsymmetrical diarylamines such as methyl-diphenylamine by reacting aniline and a phenol in the presence of a catalyst and a dehydration agent such as polyphosphoric acid (nominal formula H P4OI3). Higher polymers of phosphoric acid can also be used, e.g., P5, P6, and the hke.