The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 2024
Filed:
Dec. 29, 2022
Applicant:
Sennics Co., Ltd., Shanghai, CN;
Inventors:
Assignee:
Sennics Co., Ltd., Shanghai, CN;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 209/60 (2006.01); B01J 21/04 (2006.01); B01J 21/18 (2006.01); B01J 23/42 (2006.01); B01J 23/44 (2006.01);
U.S. Cl.
CPC ...
C07C 209/60 (2013.01); B01J 21/04 (2013.01); B01J 21/18 (2013.01); B01J 23/42 (2013.01); B01J 23/44 (2013.01);
Abstract
A method for preparing a diaryl-p-phenylenediamine compound of Formula I comprises the steps of reacting a compound of Formula II and a compound of Formula III in a condensation dehydrogenation reaction in the presence of a solvent, a hydrogen acceptor, a water-carrying agent, and a catalyst; wherein R, Rand Rare independently selected and each is H, a C1-C8 alkyl, a C3-C8 cycloalkyl, a C1-C8 alkoxy, a C3-C8 cycloalkoxy, or phenyl; a and c are independently selected and each is an integer of 0 to 5, and b is an integer of 0 to 4: