Deuterium isotopic effect on 13C NMR chemical shifts of 1-(2-hydroxyphenyl)-3-aryl-1,3-propanediones: Hydrogen bond and substituent effects

Long range deuterium isotope effects on 13C NMR chemical shifts of 2-alkanones in CD3OD solutions of imidazolium acetate ionic liquids

“…The data for chemical shi differences for all studied 2alkanones is summarized in the Table 2. Signs and values of DIE in 2-alkanones are in good agreement with those, observed by others for alkyl groups, [12][13][14][15] except experimental data for 4 D of alkanes, 15 for which negative DIE (À5.4 AE 0.5 ppb) was detected.…”

“…11 Long range DIE is observed in conjugated p-electron molecules many bonds away from the isotopic substitution site (up to twelve), 12 or in molecules with intramolecular hydrogen bonding. [13][14][15] Here we report the study of long range DIE on 1 H and 13 C{H} spectra of several simple 2-alkanones, dissolved in mixture of [C 2 mim][OAc] ILs and methanol-d 4 with the aim to determine the inuence of deuterium substitution on NMR chemical shis over two or more bonds from the substitution site.…”

Synthesis, photophysical and electrochemical properties of novel and highly fluorescent difluoroboron flavanone β-diketonate complexes

“…The synthesis of esters, diketones and flavanones and their characterization data have previously been reported in the literature. 18,19,[37][38][39][40][41][42] 4.1 Typical procedure for synthesis of difluoroboron flavanone diketonate complexes…”