Quality Control of 1-MethylpyrazoleOn May 1, 2022 ,《Phosphine-free ruthenium complexes supported by a pincer ligand bearing 1,2-dihydropyrimidine for Oppenauer-type oxidation of secondary alcohols》 appeared in Journal of Organometallic Chemistry. The author of the article were Zhou, Jun; Luo, Shubiao; Liu, Hongming; Xue, Peng. The article conveys some information:
Treatment of the (diethylaminomethyl-picolyl)pyrazolium (A3) with NaOH in dichloromethane affords the pincer ligand (L) bearing a 1,2-dihydropyrimidine unit. Reaction of [RuCl2(DMSO)4] and the ligand (L) affords the complex [RuCl2(L)(DMSO)] (Ru1). Removal of the chlorides from Ru1 with either NaBF4 or KPF6 in CH3CN produces the complexes [Ru(L)(CH3CN)3](BF4)2 (Ru2) and [Ru(L)(CH3CN)3](PF6)2 (Ru3), resp. Ru2 has been characterized with X-ray crystallog. All of the new ruthenium complexes (Ru1-Ru3) are catalytically active in the Oppenauer-type oxidation of secondary alcs. Among them, the complex Ru1 is the most active. Steric effects were observed from the outcome of substituted acetophenones. The experimental part of the paper was very detailed, including the reaction process of 1-Methylpyrazole(cas: 930-36-9Quality Control of 1-Methylpyrazole)
1-Methylpyrazole(cas: 930-36-9) belongs to pyrazoles. Pyrazoles and their related multiring analogs are common elements of a wide variety of bioactive compounds. These ring structures are rare in nature. A consequence of this is that they have previously been thought to be poor moieties to include in potential new drugs. Quality Control of 1-Methylpyrazole
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics