86840-72-4Relevant academic research and scientific papers
Synthesis and NMR Studies on a Series of Synthetic Long-Chain Selenophene Fatty Esters
Jie, Marcel S. F. Lie Ken,Cheung, Y. K.
, p. 2745 - 2778 (2007/10/02)
A report is given on the synthesis and the results of the 1H and 13C NMR spectroscopic analyses of thirteen 2,5-disubstituted selenophene fatty esters containing substituents of different chain lengths, and a mono-substituted selenophene ester, constituting a set of positional isomers of selenophene fatty esters with the heteroaromatic nucleus at different locations from the carboxylic acid or terminal methyl group.The chemical shift of the protons of the selenophene ring of the ethyl C18 selenophene esters (5-9) appears at δ 6.68.The selenophene nucleus induces a deshielding effect on the protons of the adjacent methylene protons.The carbon chemical shifts of the 2,5-disubstituted selenophene ring carbon atoms appear at about 125 ppm (ring C-3/C-4) and at about 150 ppm (ring C-2/C-5).The selenophene nucleus induces a deshielding effect on the adjacent α- and β-methylene carbon atoms, but a shielding effect on the γ-ε methylene carbon atoms.
