The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《1-Alkylpyrazoles and 1-alkyl-5-chloropyrazoles from halovinyl ketones and 1,1-dialkylhydrazines》. Authors are Bozhenkov, G. V.; Savosik, V. A.; Klyba, L. V.; Zhanchipova, E. R.; Mirskova, A. N.; Levkovskaya, G. G..The article about the compound:3-(Chloromethyl)-1-methyl-1H-pyrazolecas:84547-64-8,SMILESS:CN1N=C(CCl)C=C1).Quality Control of 3-(Chloromethyl)-1-methyl-1H-pyrazole. Through the article, more information about this compound (cas:84547-64-8) is conveyed.
Regioselective heterocyclization of chlorovinyl ketones R1COCH:C(R2)Cl (R1 = Me, R2 = H; R1 = n-Pr, R2 = H, Cl; R1 = CH2Cl, R2 = H) with 1,1-dialkyl-hydrazines NH2N(R3)2 (R3 = Me, n-Bu) to pyrazoles I involved intermediate formation of the corresponding dialkylhydrazones II. The mass spectrum fragmentation pattern of chlorine-containing pyrazoles I (R1 = CH2Cl, R2 = H, R3 = Me; R1 = n-Pr, R2 = Cl, R3 = Me) depended on the position of the halogen atom.
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Reference:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics