2785-75-3Relevant articles and documents
Catalytic Regioselective C-H Acetoxylation of Arenes Using 4,6-Dimethoxy-1,3,5-triazin-2-yloxy as a Removable/Modifiable Directing Group
Peng, Zhihua,Yu, Zhi,Li, Tian,Li, Na,Wang, Yilei,Song, Linhua,Jiang, Cuiyu
, p. 2826 - 2831 (2017)
One of the major current challenges in the field of C-H functionalization is the development of new removable/modifiable directing groups (DGs). We report here the 4,6-dimethoxy-1,3,5-triazin-2-yloxy group as a new readily removable/modifiable DG for the regioselective acetoxylation of 2-(aryloxy)-4,6-dimethoxy-1,3,5-triazine. This developed phenol-derived DG can be easily removed to offer synthetically versatile pyrocatechols or converted into a useful biphenyl skeleton. In addition, the acetoxylation of 2-(aryloxy)-4,6-dimethoxy-1,3,5-triazine offers a new avenue to synthesize polysubstituted s-triazine derivatives.
Catalytic activity of Fe-porphyrins grafted on multiwalled carbon nanotubes in the heterogeneous oxidation of sulfides and degradation of phenols in water
Rayati, Saeed,Nejabat, Fatemeh
, p. 967 - 974 (2017/09/26)
A biomimetic heterogeneous catalyst was prepared by immobilization of meso-tetrakis(4-carboxyphenyl)porphyrinatoiron(III) chloride (Fe(TCPP)Cl) on multiwalled carbon nanotubes (MWCNTs). The anchored catalyst was characterized by transmission electron microscopy, powder X-ray diffraction, ultraviolet–visible, and Fourier transform infrared spectroscopy. The amount of Fe-porphyrin loaded on the nanotubes was estimated by atomic absorption spectroscopy The thermogravimetric analysis demonstrated that the catalyst was thermally stable up to almost 350 °C, exhibiting high thermal stability. Oxidation of sulfides and phenols with urea hydrogen peroxide (UHP) in water was efficiently enhanced with excellent selectivity under the influence of [Fe(TCPP)Cl@MWCNT]. The title heterogeneous catalytic system facilitates a greener reaction because the reaction solvent is water and UHP is used as a safe oxidant.
A Catalyst-Controlled Aerobic Coupling of ortho-Quinones and Phenols Applied to the Synthesis of Aryl Ethers
Huang, Zheng,Lumb, Jean-Philip
supporting information, p. 11543 - 11547 (2016/11/17)
ortho-Quinones are underutilized six-carbon-atom building blocks. We herein describe an approach for controlling their reactivity with copper that gives rise to a catalytic aerobic cross-coupling with phenols. The resulting aryl ethers are generated in high yield across a broad substrate scope under mild conditions. This method represents a unique example where the covalent modification of an ortho-quinone is catalyzed by a transition metal, creating new opportunities for their utilization in synthesis.