The crystal structures of four dimethoxybenzaldehyde isomers

Vlieg, E.; Engwerda, Antonius H.J.; Kalkman, E; Ronde, E.A. de; Tinnemans, Paul; Vlieg, Elias

doi:10.1107/s2056989018017152

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“…Aldehydes and ketones are key building blocks for a wide range of synthetic and natural derivatives and are used in several applications such as the Schiff base reaction [ 1 , 2 , 3 , 4 ]. In particular, aldehydes are commonly used for the development of effective drugs due to their several biological activities resulting from the polar HC=O group [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Exo⇔Endo Isomerism, MEP/DFT, XRD/HSA-Interactions of 2,5-Dimethoxybenzaldehyde: Thermal, 1BNA-Docking, Optical, and TD-DFT Studies

et al. 2020

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The exo⇔endo isomerization of 2,5-dimethoxybenzaldehyde was theoretically studied by density functional theory (DFT) to examine its favored conformers via sp2–sp2 single rotation. Both isomers were docked against 1BNA DNA to elucidate their binding ability, and the DFT-computed structural parameters results were matched with the X-ray diffraction (XRD) crystallographic parameters. XRD analysis showed that the exo-isomer was structurally favored and was also considered as the kinetically preferred isomer, while several hydrogen-bonding interactions detected in the crystal lattice by XRD were in good agreement with the Hirshfeld surface analysis calculations. The molecular electrostatic potential, Mulliken and natural population analysis charges, frontier molecular orbitals (HOMO/LUMO), and global reactivity descriptors quantum parameters were also determined at the B3LYP/6-311G(d,p) level of theory. The computed electronic calculations, i.e., TD-SCF/DFT, B3LYP-IR, NMR-DB, and GIAO-NMR, were compared to the experimental UV–Vis., optical energy gap, FTIR, and 1H-NMR, respectively. The thermal behavior of 2,5-dimethoxybenzaldehyde was also evaluated in an open atmosphere by a thermogravimetric–derivative thermogravimetric analysis, indicating its stability up to 95 °C.

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