Contact term contribution to lanthanide induced shifts in proton and carbon-13 NMR spectra of pyridine N-oxides was written by Tori, Kazuo;Yoshimura, Yohko;Kainosho, Masatsune;Ajisaka, Katsumi. And the article was included in Tetrahedron Letters in 1973.Quality Control of 3,5-Dimethylpyridine 1-oxide This article mentions the following:
Shifts induced by M(FOD)3, Eu(PTA)3, and M(DPM)3 (M = Eu, Pr, HFOD = 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dione, HPTA = pivaloyltrifluoroacetone, HDPM = dipivaloylmethane) in the 1H and 13C NMR of pyridine N-oxide and its alkyl derivatives included a contact term contribution. Upfield shifts were observed for the 灏?H and 绾?Me PMR signals and the directions of 13C shifts were those predicted for contact interaction. In the experiment, the researchers used many compounds, for example, 3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8Quality Control of 3,5-Dimethylpyridine 1-oxide).
3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. 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.Quality Control of 3,5-Dimethylpyridine 1-oxide