Tautomeric and conformational equilibrium of acenaphthenequinonemonooxime

Synthesis, characterisation and antimicrobial activity of bivalent metal (Zn, Cd, Hg, Pb and Ag) chelates of 1, 2- naphthoquinone dioxime

“…The chemical shifts of the metal chelates are given in Table:10, The chemical shift for C1 is observed in the range 140.62 to 147.99 ppm for the chelates under studies and that of C2 is observed in range 133.94 to 140.81 ppm. The chemical shifts of remaining carbons are in good agreement (23,24). …”

Anthracene Carboxyimides and Their Dimers

“…ref. [6]). The mixture of 4 and 5 exhibits a strong fluorescence both in solution and in the solid state (see the complicated solid-state fluorescence spectrum in Figure 2).…”

“…[2a, b, 9] Alternatively, the mixture of oximes 4 and 5 can be directly converted into 7 a, although the conditions used for this reaction are strongly alkaline, whereas acidic conditions are commonly used in the Beckmann rearrangement. [16] The simple interconversion of such oximes [6] via intermediate nitroso compounds may therefore be of importance. Compound 8 a is formed as a byproduct of the reaction with the alkali melt in a ratio of 1:8 with respect to 7 a.…”

“…The NMR tube was then opened and irradiation was continued until complete evaporation. 6, 125.96, 126.04, 127.4, 127.6, 128.0, 129.2, 130.0, 131.3, 132.5, 132.8, 135.5, 140.2, 140.7, 141.2, 143.2, 144.0, 165.3 (C=O) [M] + , 274 (9) + , 75 (6).…”

New Look on 3-Hydroxyiminoflavanone and Its Palladium(II) Complex: Crystallographic and Spectroscopic Studies, Theoretical Calculations and Cytotoxic Activity

“…13 C-NMR spectra recorded in DMSO-d6 and CDCl3 reveal a signal assigned to the carbonyl carbon atom near 177 ppm ( Figure S5 in Supplementary Materials), which is typical for carbonyl carbon atoms C=O [31,32]. Signals from C-OH carbon atoms should be right-shifted towards around 160 ppm [32,35]. …”