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US 12,037,303 B2Granted
Method for preparing diaryl p-phenylenediamine compounds
AssigneeSennics Co., Ltd.
InventorsJinguo Xing, Xiangyun Guo, Zhimin Tang
Life of this patent
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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 R1, R2 and R3 are 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:
Claims19
A method for preparing a compound of Formula I:
- comprising:
- reacting a compound of Formula II and a compound of Formula III in a condensation dehydrogenation reaction in presence of a solvent, a hydrogen acceptor, a water-carrying agent, and a catalyst to obtain the compound of Formula I:
- wherein R1, R2 and R3 are 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, and
- the hydrogen acceptor is nitrobenzene, o-nitrotoluene, m-nitrotoluene, p-nitrotoluene, p-nitrophenol, o-nitrophenol, m-nitrophenol, o-nitroanisole, m-nitroanisole, p-nitroanisole, o-nitrophenyl ethyl ether, m-nitrophenyl ethyl ether, m-nitrophenyl ethyl ether, p-nitrophenyl ethyl ether, styrene, α-methylstyrene, or a combination thereof.
2 more elements
Dependencies are inferred from the claim text.