Studies on the Derivatives of Biphenylene Oxide. VII. The Influence of Substitution on the Opening and Closing of the Furan-ring of Biphenylene Oxide
作者:Seishi Yamashiro
DOI:10.1246/bcsj.17.10
日期:1942.1
removal of acetyl groups of those compounds and also the formation of the furan-ring. This facilitating effect varies with the relative position of the nitrogroup and the acetoxyl group, the order of the effect being ortho>para>meta; but the m-nitrosubstitution induces no ring-formation, giving exclusively nitrobiphenols. (ii) The introduction of bromine into the diacetoxydiphenyls hinders the removal
Periodic mesoporous organosilicas containing biphenol bridging groups were modified post-synthesis to prepare aryl phosphate esters from the free diols.
含有联苯桥联基团的周期性介孔有机硅材料经过后合成改性,以从游离二醇制备芳基磷酸酯。
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.
Litwinenko et al., Zhurnal Obshchei Khimii, 1957, vol. 27, p. 3115,3120; engl. Ausg. S. 3154, 3158
作者:Litwinenko et al.
DOI:——
日期:——
Exploiting Potential Inversion for Photoinduced Multielectron Transfer and Accumulation of Redox Equivalents in a Molecular Heptad
作者:Julia Nomrowski、Oliver S. Wenger
DOI:10.1021/jacs.8b02443
日期:2018.4.25
doubly charge-separated photoproduct is 0.5%. In acidic oxygen-free solution, the reduction product is a stable dithiol. Under steady-state photoirradiation, our heptad catalyzes the two-electronreduction of an aliphatic disulfide via thiolate-disulfide interchange. Exploitation of potential inversion for the reversible light-driven accumulation of redox equivalents in artificial systems is unprecedented