Zawartka, W. et al. published their research in Advanced Synthesis & Catalysis in 2006 | CAS: 65350-59-6

1-Butyl-4-methylpyridin-1-ium bromide (cas: 65350-59-6) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Name: 1-Butyl-4-methylpyridin-1-ium bromide

Methoxycarbonylation of iodobenzene in ionic liquids. A case of inhibiting effect of imidazolium halides was written by Zawartka, W.;Trzeciak, A. M.;Ziolkowski, J. J.;Lis, T.;Ciunik, Z.;Pernak, J.. And the article was included in Advanced Synthesis & Catalysis in 2006.Name: 1-Butyl-4-methylpyridin-1-ium bromide This article mentions the following:

The palladium(II) complexes, PdCl2(cod) (1), PdCl2[P(OPh)3]2 (2), [bmim]2[PdCl4] (3), and [bmpy]2[PdCl4] (4) (bmim = 1-butyl-3-methylimidazolium cation, bmpy = 1-butyl-4-methylpyridinium cation), were active catalysts for the methoxycarbonylation of iodobenzene in ionic liquid (IL) media. The best results were obtained in pyridinium salts, [bmpy]X (X = Cl, Br, BF4, PF6) (76-100% yield). In methoxycarbonylation reactions carried out in imidazolium salts, [bmim]BF4 and [bmim]PF6, the yield of benzoic acid Me ester was slightly lower (50-78% yield), whereas in [bmim]X (X = Cl, Br) the reaction was totally retarded. The inhibiting effect was not observed when a Me group was present at C-2 (instead of a proton) on the imidazole ring. A palladium-carbene complex, Pd(bmimy)2Br2 (5), obtained in the reaction of a palladium catalyst precursor with [bmim]Cl, presented much lower activity than precursors 1–4. Its formation may explain the observed inhibition of methoxycarbonylation in a [bmim]Cl medium. The crystal structures of some of the palladium-carbene complexes were determined In the experiment, the researchers used many compounds, for example, 1-Butyl-4-methylpyridin-1-ium bromide (cas: 65350-59-6Name: 1-Butyl-4-methylpyridin-1-ium bromide).

1-Butyl-4-methylpyridin-1-ium bromide (cas: 65350-59-6) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Name: 1-Butyl-4-methylpyridin-1-ium bromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem