Patent ID: 11905237
Assignee: THE CHINESE UNIVERSITY OF HONG KONG
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method of halogenation, the method comprising contacting a reactant bisphenol with a source of a halogen in the presence of a catalyst under process conditions sufficient to prepare a halogenated bisphenol, wherein
the halogen source is bromine, N-bromosuccinimide (NBS), N-bromophthalimide (NBP), N-bromoacetamide (NBA), 1,3-dibromo-5,5-dimethylhydantoin (DBDMH), 1,3-di bromo-5,5-diphenylhydantoin (DBDMH), 2,4,4,6-tetrabromo-2,5-cyclohexadienone (TBCO), chlorine, N-chlorosuccinimide (NCS), N-chlorophthalimide (NCP), 1,3-dichloro-5,5-dimethylhydantoin (DCDMH), 1,3-di chloro-5,5-diphenylhydantoin (DCDPH), 1-(4-methylbenzoyl)-3-chloro-5,5-diphenylhydantoin, iodine, or N-iodosuccinimide; and
the catalyst is N-[3,5-bis(trifluoromethyl)phenyl]-N′-[(1S,2S)-2-(dimethylamino)cyclohexyl]urea; N-[3,5-bis(trifluoromethyl)phenyl]-N′-[(1S,2S)-2-(di-n-pentylamino)cyclohexyl]urea; 3-[[3,5-bis(trifluoromethyl)phenyl]amino]-4-[[(1S,2S)-2-(dimethylamino)cyclohexyl]amino]-3-cyclobutene-1,2-dione; N-[3,5-bis(trifluoromethyl)phenyl]-N′-[(1S,2S)-2-[(11bS)-3,5-dihydro-4H-dinaphth[2,1-c:1′,2′-e]azepin-4-yl]cyclohexyl]urea; or N-[3,5-bis(trifluoromethyl)phenyl]-N′-[(1S,2S)-2-[(11bR)-3,5-dihydro-4H-dinaphth[2,1-c:1′,2′-e] azepin-4-yl]cyclohexyl]urea.