Preparation of 5-Brominated and 5,5‘-Dibrominated 2,2‘-Bipyridines and 2,2‘-Bipyrimidines
作者:Peter F. H. Schwab、Frank Fleischer、Josef Michl
DOI:10.1021/jo010707j
日期:2002.1.1
two reactive positions with lithium di-tert-butyl-(2,2,6,6-tetramethylpiperidino)zincate. 5,5'-Dibromo-2,2'-bipyridine was obtained by the reductive symmetric coupling of 2,5-dibromopyridine with hexa-n-butyldistannane. The yields of these coupling reactions ranged from 70 to 90%. 5-Bromo- and 5,5'-dibromo-2,2'-bipyrimidines were obtained in yields of 30 and 15%, respectively, by bromination of 2,2'-bipyrimidine
A high-yield synthesis was developed for the preparation of 2,2'-bipyrimidine (1) using the Ullmann coupling of 2-iodopyrimidine. The new procedure was also used for the preparation of 4,4',6,6'-tetramethyl-2,2'-bipyrimidine (2) and 5,5'-dibromo-2,2'-bipyrimidine (3).
Managing Orientation of Nitrogens in Bipyrimidine-Based Thermally Activated Delayed Fluorescent Emitters To Suppress Nonradiative Mechanisms
作者:Hee-Jun Park、Si Hyun Han、Jun Yeob Lee、Herim Han、Eung-Gun Kim
DOI:10.1021/acs.chemmater.8b00006
日期:2018.5.22
(TADF) materials, (5,5′-bis(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)-2,2′-bipyrimidine (22bpmAc), 10,10′-([2,5′-bipyrimidine]-2′,5-diylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine) (25bpmAc), and 2,2′-bis(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)-5,5′-bipyrimidine (55bpmAc)) based on bipyrimidine cores as the new electron-acceptingunits and acridine as the electron-donating unit were designed
Visible-light-controlled polymerization was achieved by a bichromophoric organopalladium catalyst which possesses a naphthyl-substituted cyclometallated Ir(iii) light-absorbing moiety.
Syntheses and structure of dinuclear metal complexes containing naphthyl-Ir bichromophore
作者:Ryo Ohyama、Masaki Mishima、Akiko Inagaki
DOI:10.1039/d1dt01853a
日期:——
of novel metalcomplexes were synthesized containing an Ir-cyclometalated bichromophore as a visible-light sensitizer. A new bichromophoric unit containing a naphthyl substituent and methyl substituents on the 2-phenylpyridine chelating ligand was synthesized and characterized for the first time. According to the increased crystallinity of the bichromophoric unit, novel Ir–M metalcomplexes (M = Pd