78009-23-1Relevant academic research and scientific papers
O -aryloxide-N-heterocyclic carbenes: Efficient synthesis of the proligands and their p -cymene ruthenium complexes
Yang, Dandan,Tang, Yungang,Song, Haibin,Wang, Baiquan
, p. 2012 - 2017 (2015)
An efficient method to synthesize o-hydroxyaryl-substituted imidazoles (2-OH-3-R-5-tBuC6H2)(C3H3N2) [R = tBu (1a), H (1b)] was developed through copper-catalyzed C-N bond formation. Treatment of 1a or 1b with a halohydrocarbon in refluxing toluene afforded a series of o-hydroxyaryl imidazolinium proligands 2a-h in high yields. Reactions of proligands 2a-h with Ag2O and [(p-cymene)RuCl2]2 gave the corresponding o-aryloxide-N-heterocyclic carbene ligated p-cymene ruthenium complexes 3a-h. All the imidazolium salts and ruthenium complexes were fully characterized by 1H and 13C NMR spectra, elemental analysis, and high-resolution mass spectrometry. Without the cocatalyst or irradiation, these complexes can efficiently catalyze norbornene ring-opening metathesis polymerization. Notably, the structures of the catalysts were found to have significant effects on the catalytic activity and the properties of obtained polymers.
CYCLOHEXADIENONES. 5. REACTION OF 4-HALO-2,4,6-TRI-t-BUTYL-2,5-CYCLOHEXADIEN-1-ONES WITH IMIDAZOLES
Fukata, Gouki,Itoh, Takashi,Tashiro, Masashi
, p. 549 - 554 (2007/10/02)
Reactions of 4-bromo- (1a) and 4-chloro-2,4,6-tri-t-butyl-2,5-cyclohexadien-1-one (1b) with imidazole (6b), 1-methyl- (6a), 2-methyl- (6c), 4-methylimidazole (6d), benzimidazole (6e), and 2-methylbenzimidazole (6f) was carried out under various conditions.It was found in these reactions that many products such as the 1-(4-oxo-2,5-cyclohexadienyl)-, 1-(2-hydroxyphenyl)- and 1-(4-hydroxyphenyl)imidazoles were formed and that the type of the products depended upon the structures of imidazoles 6.
