IR-spectroscopic study of the structure of indazoles, pyrazolo[3,4-b]pyridines, and pyrazolo[3,4-b]pyrazine was written by Sennitskaya, L. V.;Timoshenkova, Yu. D.;Kikot, B. S.;Pentin, Yu. A.;Blanko, F. F.;Korbukh, I. A.;Preobrazhenskaya, M. N.. And the article was included in Khimiya Geterotsiklicheskikh Soedinenii in 1977.Product Details of 63725-52-0 This article mentions the following:
The IR of I (R = H, Me), II, III (R = H, NH2, Me2N), IV, V (R, R1 = H, Me), and VI were discussed. A band at 2500-3300 cm-1, shifted to 2000-2400 cm-1 by deuteration, indicated that intermol. H bonding occurred in the crystals of the NH compounds The IR also indicated that protonation of III (R = NH2) occurred on one of the ring N atoms. In the experiment, the researchers used many compounds, for example, 6-Chloro-1-methylpyrazolo[5,4-b]pyridine (cas: 63725-52-0Product Details of 63725-52-0).
6-Chloro-1-methylpyrazolo[5,4-b]pyridine (cas: 63725-52-0) belongs to pyrazole derivatives. The 1H-pyrazole provides an excellent means by which to provide the requisite hydrogen bond acceptor–donor motifs, whether as a monocyclic ring or as a fused indazole ring. Pyrazole rings have been used as core components of several leading non-steroidal anti-inflammatory drugs (NSAIDs) and antihypertensive drugs. It has also been found to be useful as a bifunctional ligand for metal catalysis.Product Details of 63725-52-0
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics