Vetokhina, Volha et al. published their research in ChemPhysChem in 2012 | CAS: 19959-77-4

2-(5-Methyl-1H-pyrazol-3-yl)pyridine (cas: 19959-77-4) 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. The presence of both electronegative nitrogen atoms in the pyrazole ring reduces the electron density of the C3- and C5-positions leaving electron density of C4-position unaltered. Thus the C4-position is vulnerable to electrophilic attack. The C3 electrophilic-position may undergo deprotonation in the presence of a strong base leading to ring opening.Recommanded Product: 2-(5-Methyl-1H-pyrazol-3-yl)pyridine

Three Modes of Proton Transfer in One Chromophore: Photoinduced Tautomerization in 2-(1H-Pyrazol-5-yl)Pyridines, Their Dimers and Alcohol Complexes was written by Vetokhina, Volha;Dobek, Krzysztof;Kijak, Michal;Kaminska, Izabela I.;Muller, Keven;Thiel, Werner R.;Waluk, Jacek;Herbich, Jerzy. And the article was included in ChemPhysChem in 2012.Recommanded Product: 2-(5-Methyl-1H-pyrazol-3-yl)pyridine This article mentions the following:

Studies of 2-(1H-pyrazol-5-yl)pyridine (PPP) and its derivatives 2-(4-methyl-1H-pyrazol-5-yl)pyridine (MPP) and 2-(3-bromo-1H-pyrazol-5-yl)pyridine (BPP) by stationary and time-resolved UV/Vis spectroscopic methods, and quantum chem. computations show that this class of compounds provides a rare example of mols. that exhibit three types of photoreactions: (1) excited-state intramol. proton transfer (ESIPT) in the syn form of MPP, (2) excited-state intermol. double-proton transfer (ESDPT) in the dimers of PPP in nonpolar media, as well as (3) solvent-assisted double-proton transfer in hydrogen-bonded 1:1 complexes of PPP and MPP with alc. partners. The excited-state processes are manifested by the appearance of a dual luminescence and a bimodal irreversible kinetic coupling of the two fluorescence bands. Ground-state syn-anti equilibrium are detected and discussed. The fraction of the higher-energy anti form varies for different derivatives and is strongly dependent on the solvent polarity and hydrogen-bond donor or acceptor abilities. In the experiment, the researchers used many compounds, for example, 2-(5-Methyl-1H-pyrazol-3-yl)pyridine (cas: 19959-77-4Recommanded Product: 2-(5-Methyl-1H-pyrazol-3-yl)pyridine).

2-(5-Methyl-1H-pyrazol-3-yl)pyridine (cas: 19959-77-4) 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. The presence of both electronegative nitrogen atoms in the pyrazole ring reduces the electron density of the C3- and C5-positions leaving electron density of C4-position unaltered. Thus the C4-position is vulnerable to electrophilic attack. The C3 electrophilic-position may undergo deprotonation in the presence of a strong base leading to ring opening.Recommanded Product: 2-(5-Methyl-1H-pyrazol-3-yl)pyridine

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics