Lyalin, B. V. published the artcileOxidative transformation of N-substituted 3-aminopyrazoles to azopyrazoles using electrogenerated bromine as a mediator, Quality Control of 105675-85-2, the publication is Russian Chemical Bulletin (2018), 67(3), 510-516, database is CAplus.
The one-pot process of anodic transformation of N-alkyl-3-aminopyrazoles into azopyrazoles I [R1 = H, Me, Et; R2 = H, Me; R3 = Br, Me] under conditions of membraneless electrolysis in an aqueous solution of NaBr was studied for the first time. It was found that under these conditions the aminopyrazoles, which do not have a substituent at position 4, transform into the corresponding 4,4′-dibromoazopyrazoles. The corresponding yield was in the interval of 28-80%, depending on the structure of the products. The transformation of 4-substituted aminopyrazoles resulted in the formation of azopyrazoles in the yields lying within 62-86% when this process was implemented under conditions with the anodically generated Br2 acting as a mediator. A convenient method of anodic synthesis of azopyrazoles in an aqueous medium without the use of additives of chem. oxidants was proposed. The process was environmentally sound and was characterized by a high atom efficiency (>85%).
Russian Chemical Bulletin published new progress about 105675-85-2. 105675-85-2 belongs to pyrazoles-derivatives, auxiliary class Pyrazole,Bromide,Amine, name is 4-Bromo-1-methyl-1H-pyrazol-5-amine, and the molecular formula is C4H6BrN3, Quality Control of 105675-85-2.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics