Gold-catalyzed direct oxidative coupling reactions of non-activated arenes
作者:Anirban Kar、Naveenkumar Mangu、Hanns Martin Kaiser、Man Kin Tse
DOI:10.1016/j.jorganchem.2008.11.016
日期:2009.2
A general gold-catalyzedoxidative homo- and hetero-coupling of arenes in mild conditions is described. This reaction gives moderate to excellent yield using PhI(OAc)2 as an oxidant. The effects of temperature, solvent, oxidant and concentration of substrate in this process have also been studied in detail. The product identity and distribution as well as the substrate limitation give us insights into
Hale; Robertson, American Chemical Journal, 1908, vol. 39, p. 685
作者:Hale、Robertson
DOI:——
日期:——
Kanakalakshmi,B.; Sethna,S., Journal of the Indian Chemical Society, 1969, vol. 46, # 5, p. 444 - 450
作者:Kanakalakshmi,B.、Sethna,S.
DOI:——
日期:——
13C chemical shifts of symmetrically substituted biphenyls: Unambiguous signal assignment for the carbonsortho andpara to an aryl group
作者:Karou Fuji、Toshihide Yamada、Eiichi Fujita
DOI:10.1002/mrc.1270170406
日期:1981.12
AbstractThe natural abundance 13C NMR spectra of 2,2′‐dimethyl‐, 2,2′‐dimethoxy‐ and 2,2′‐dihydroxybiphenyls, and a series of 2,2′‐dimethoxy‐5,5′‐disubstituted biphenyls were recorded. Unambiguous signal assignments of the carbons ortho and para to an aryl ring in biphenyls were made by selective deuteration and/or the graphical method for 1H single frequency off‐resonance decoupled spectra. Contrary to the reported assignments, it was shown that the signal for C‐6 in 2,2′‐dimethylbiphenyl clearly appears at lower field than that for C‐4. The signals for the ortho carbons (C‐6) of 2,2′‐dimethoxy‐5,5′‐disubstituted biphenyls generally appeared at lower fields than those for the para carbons (C‐4). The validity of applying deuterium isotope shifts to the assignments of 13C chemical shifts of di‐ and tetra‐substituted biphenyls is also discussed.