367-27-1Relevant articles and documents
Trinuclear Mn2+/Zn2+based microporous coordination polymers as efficient catalysts foripso-hydroxylation of boronic acids
Bora, Sanchay J.,Dutta, Anurag,Goswami, Shyam,Guha, Ankur K.,Paul, Rima,Thakur, Ashim J.
, p. 5454 - 5462 (2020/05/16)
Two microporous coordination polymers based on hourglass trinuclear building units, [Mn3(bpdc)3(bpy)]·2DMF and [Zn3(bpdc)3(bpy)]·2DMF·4H2O (bpdc = 4,4′-biphenyl dicarboxylic acid, bpy = 4,4′-bipyridine), have been synthesized under solvothermal conditions employing DMF as the solvent. Each structure consists of two crystallographically distinct M2+(M1 and M2) centers that are connectedviacarboxylate bridges from six bpdc ligands, generating a trinuclear metal cluster, [M3(bpdc)3(bpy)]. Cluster representation of the structure resulted in an interpenetrated net of rarehextopological type. Catalytic activities of the CPs have been assessed for the oxidative hydroxylation of phenylboronic acids (PBAs) using aqueous hydrogen peroxide (H2O2). Various substituted aryl/hetero-arylboronic acids RB(OH)2[R = phenyl, 2,4-difluorophenyl, 4-aminophenyl, 2-thiopheneetc.] underwentipso-hydroxylation smoothly at room temperature to generate the corresponding phenols in excellent yields. The main advantages of this protocol are the aqueous medium reaction, heterogeneous catalytic system, and short reaction time with excellent yield.
Size-tunable ZnO nanotapes as an efficient catalyst for oxidative chemoselective C–B bond cleavage of arylboronic acids
Phukan, Shreemoyee,Mahanta, Abhijit,Rashid, Md. Harunar
, p. 58 - 66 (2018/06/07)
Herein, we report a simple but effective chemical approach for the synthesis of size-tunable ZnO nanotapes by precipitation method in the presence of phytochemicals present in the flower extract of Lantana camara plant. The electron microscopic study confirmed that the size of ZnO nanotapes can be systematically controlled by varying the concentration of either flower extract or metal ions and the flower extract played the key role in controlling the growth of ZnO nanotapes. The phase and crystalline analysis was carried out by X-ray diffraction method which indicated that ZnO nanostructures are highly crystalline in nature and are free from any impurities. The synthesized ZnO nanostructures exhibited interesting optical properties as investigated by UV–vis absorption and photoluminescence spectroscopy. Further the surface functionalities affect the optical properties of ZnO nanostructures which possess relatively strong UV emissions; a blue emission and a green emission. The synthesized ZnO nanostructures showed excellent catalytic properties in the ipso-hydroxylation of different aryl/ hetero-arylboronic acid to phenol in a relatively greener reaction conditions. These catalysts are highly stable and are re-usable upto six cycles of ipso-hydroxylation without losing its catalytic properties.
Process for preparing phenol fluoride by amine catalytic method
-
Paragraph 0028; 0030; 0038; 0054-0058, (2017/04/03)
The invention relates to a process for preparing phenol fluoride by amine catalytic method and belongs to the technical field of chemical synthesis.The process comprises: adding phenol and a catalyst sequentially into a reactor for heating, introducing fluorine-nitrogen mixed gas into the reactor for reacting, purging with nitrogen after reacting to obtain crude phenol fluoride, charging purging gas and reaction tail gas sequentially into an activated carbon absorber and a solid sodium lime absorber for adsorption, discharging finally obtained non-condensable gas at a great height, rectifying and separating the crude phenol fluoride to obtain o-fluorophenol, p-fluorophenol, 2,4-difluorophenol and 2,6-difluorophenol.The problem that an existing preparation process has low product yield, high solvent consumption, high cost and environmental pollution is solved herein, the process has the advantages of material conversion completeness, little byproduct and low production cost, no additional solvent is added to maintain a certain temperature range, cost is saved, and solvent loss is reduced.