4460-86-0Relevant articles and documents
Synthesis of new Zn (II) complexes for photo decomposition of organic dye pollutants, industrial wastewater and photo-oxidation of methyl arenes under visible-light
Ahemed, Jakeer,Bhongiri, Yadagiri,Chetti, Prabhakar,Gade, Ramesh,Kore, Ranjith,Pasha, Jakeer,Pola, Someshwar,Rao D, Venkateshwar
, (2021/07/28)
Synthesis of new Schiff's base Zn-complexes for photo-oxidation of methyl arenes and xylenes are reported under visible light irradiation conditions. All the synthesized new ligands and Zn-complexes are thoroughly characterized with various spectral analyses and confirmed as 1:1 ratio of Zn and ligand with distorted octahedral structure. The bandgap energies of the ligands are higher than its Zn-complexes. These synthesized new Zn(II) complexes are used for the photo-fragmentation of organic dye pollutants, photodegradation of food industrial wastewater and oxidation of methyl arenes which are converted into its respective aldehydes with moderate yields under visible light irradiation. The photooxidation reaction dependency on the intensity of the visible light was also studied. With the increase in the dosage of photocatalyst, the methyl groups are oxidized to get aldehydes and mono acid products, which are also identified from LC-MS data. Finally, [Zn(PPMHT)Cl] is with better efficiency than [Zn(PTHMT)Cl] and [Zn(MIMHPT)Cl] for oxidation of methyl arenes is reported under visible-light-driven conditions.
Monodentate Transient Directing Group Enabled Pd-Catalyzed Ortho-C-H Methoxylation and Chlorination of Benzaldehydes
Li, Feng,Zhou, Yirong,Yang, Heng,Wang, Ziqi,Yu, Qinqin,Zhang, Fang-Lin
supporting information, p. 3692 - 3695 (2019/05/24)
We report Pd-catalyzed ortho-C-H methoxylation and chlorination of benzaldehydes by employing monodentate transient directing groups (TDGs) as an alternative strategy to bidentate TDGs. More importantly, a single crystal of benzaldehyde imine ortho-cyclopalladium intermediate was successfully obtained, and its structure was unambiguously determined by X-ray diffraction, which clearly showed that it was a binuclear palladium species bridged by a pyridone ligand. The utility of this approach was further demonstrated through the synthesis of key intermediates of natural products and drugs.
Synthesis method of pharmaceutical intermediate 2,4,5-trimethoxybenzoic acid
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Paragraph 0008; 0019-0022, (2018/09/08)
The invention discloses a synthesis method of a pharmaceutical intermediate 2,4,5-trimethoxybenzoic acid. The synthesis method takes 1,2,4-trimethoxybenzene, DMF (Dimethyl Formamide), phosphoryl chloride, 2,4,5-trimethoxybenzaldehyde, silver nitrate, acetonitrile, hydrogen peroxide, zirconium oxide and MCM-41 as main raw materials, and MCM-41 zeolite powder is subjected to short-chain modificationby adopting tetraethyl orthosilicate TEOS; ultrasonic treatment is carried out on a mixed alkali solution and metal ion frameworks of nickel nitrate and aluminum nitrate are used for replacing to form a unique space three-dimensional framework structure with catalytic activity. According to the synthesis method disclosed by the invention, the disadvantages that products are complicated, the products are difficultly completely purified and the like, caused by drastic oxidization reaction of traditional benzaldehyde, are overcome by an intermediate catalyst, and the intermediate catalyst has anexcellent catalysis effect on synthesis reaction of the 2,4,5-trimethoxybenzoic acid.