Belen’kii, L. I. published the artcileAlternative mechanisms of electrophilic substitution in azole series, Product Details of C4H6N2, the publication is Russian Chemical Bulletin (2016), 65(6), 1441-1447, database is CAplus.
Data on three mechanisms of aromatic electrophilic substitution in azole series were presented. First of them is similar to an ordinary addition-elimination mechanism including the formation of a cationic σ-complex (Wheland intermediate). The second mechanism is realized according to the elimination-addition scheme and includes a protonation or a formation of a complex on the pyridine N atom, proton abstraction from the C atom adjacent to the above N atom, and addition of a cationoid reagent to the ylide (carbene) formed. The third mechanism proposed by the present authors can be realized for azoles having three and two N atoms of the pyridine type. It does not require the preliminary N-protonation or complex formation and occurs due to a strong electron withdrawing effect of several pyridine atoms, resulting in the CH-deprotonation followed by the interaction of the carbanion formed with a cation under mild conditions.
Russian Chemical Bulletin published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, Product Details of C4H6N2.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics