Pyrazoles are synthesized by the reaction of α,β-unsaturated aldehydes with hydrazine and subsequent dehydrogenation. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. Substituted pyrazoles are prepared by condensation of 1,3-diketones with hydrazine (Knorr-type reactions). For example, acetylacetone and hydrazine gives 3,5-dimethylpyrazole. Application of C6H8N2O2.
Wang, Shufan;Chen, Jun;Kou, Weizhi;Qiu, Lijun;Luo, Shipeng;Wang, Xin;Fu, Lianshe;Yang, Tinghai research published 《 Construction of Novel Coordination Polymers Based on Pyrazole Carboxylic Acid and Doping for Enhancing the Photocatalytic Property Under Visible Light》, the research content is summarized as follows. Visible-light-driven photocatalysis is a promising approach for the degradation of organic pollutants due to its effective use of sunlight resources. Therefore, the design and synthesis of novel coordination polymers (CPs) as photocatalysts and the regulation of photocatalytic performance have attracted considerable attention. Herein, the authors designed and synthesized a light absorption ligand 1-(carboxymethyl)-1H-pyrazole-4-carboxylic acid (H2cmpc) and prepared six novel CPs with different 3d transition metal ions, named [Mn3(cmpc)2(μ3-OH)2(H2O)4]·2H2O (1), [M(cmpc)(H2O)3] (M = Co (2), Ni (3), Co0.4Ni0.6 (4)), and [M(Hcmpc)2(H2O)4] (M = Co (5), Ni (6)). The H2cmpc organic linker has three kinds of coordination bridging modes in the six CPs. CP 1 presents a layered structure with a channel. CPs 2–4 are isostructural and show a one-dimensional chain structure. CPs 5 and 6 are isostructural and exhibit a mononuclear structure with six-coordinated metal ions, which are connected into a 3D supramol. structure constructed through hydrogen bonds. Photocatalytic degradation experiments of CPs 2–4 were conducted, indicating that CPs 2–4 show excellent photocatalytic performance under visible light. Furthermore, Co/Ni codoping can enhance the photocatalytic performance compared with single metal CPs. The photocatalytic degradation mechanisms of CPs 2–4 were studied.
Application of C6H8N2O2, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.
Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, 37622-90-5.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics