Synthesis, Characterization, Crystal Structure, and Thermal Analysis of 4-[(3-acetylphenyl)amino]-2-methylidene-4-oxobutanoic Acid
作者:Prakash S. Nayak、Badiadka Narayana、Sumati Anthal、Vivek K. Gupta、Rajni Kant、H. S. Yathirajan
DOI:10.1080/15421406.2013.858582
日期:2014.3.24
4-[(3-Acetylphenyl)amino]-2-methylidene-4-oxobutanoic acid (1) is synthesized by a ring opening reaction of itaconic anhydride with 3-aminoacetophenone and characterized by FT-IR, H-1 NMR, UV-Vis, TGA, DTA, and single crystal X-ray diffraction. The crystal of 1 belongs to triclinic unit cell in the P-1 space group with the unit cell dimensions a = 4.9485(3), b = 5.3614(6), c = 22.457(2) angstrom, alpha = 88.295(8), beta = 89.379(7), gamma = 84.495(7), and Z = 2 The crystal structure is solved by direct methods using single-crystal X-ray diffraction data collected at room temperature and refined by full-matrix least-squares procedures to a final R-value of 0.0467 for 1623 observed reflections. Intermolecular NH horizontal ellipsis O and OH horizontal ellipsis O hydrogen bonds links the molecules into chains along [010] direction. In addition the thermal stability of the 1 is determined by using DTA, TGA analysis, and wavelength absorption at lambda(max) = 297nm is determined by UV-Vis spectrophotometer.
FT-IR, molecular structure, first order hyperpolarizability, MEP, HOMO and LUMO analysis and NBO analysis of 4-[(3-acetylphenyl)amino]-2-methylidene-4-oxobutanoic acid
作者:Rahul Raju、C. Yohannan Panicker、Prakash S. Nayak、B. Narayana、B.K. Sarojini、C. Van Alsenoy、Abdulaziz A. Al-Saadi
DOI:10.1016/j.saa.2014.06.051
日期:2015.1
4-[(3-Acetylphenyl)amino1-2-methylidene-4-oxobutanoic acid is synthesized and the structure of the compound was confirmed by IR, H-1 NMR and single crystal X-ray diffraction studies. FT-IR spectrum of 4-[(3-acetylphenyl)amino]-2-methylidene-4-oxobutanoic acid was recorded and analyzed. The crystal structure is also described. The vibrational wavenumbers were computed using HF and DFF methods are assigned with the help of potential energy distribution analysis. The NH stretching frequency is red shifted in the IR spectrum with a strong intensity from the computed frequency, which indicates the weakening of the NH bond resulting in proton transfer to the neighboring oxygen atom. The first hyperpolarizability and infrared intensities are also reported. The stability of the molecule arising from hyper-conjugative interaction and charge delocalization has been analyzed using NBO analysis. The HOMO and LUMO analysis are used to determine the charge transfer within the molecule. Molecular electrostatic potential map was performed by the DFT method. The geometrical parameters of the title compound obtained from XRD studies are in agreement with the calculated (DFT) values. (C) 2014 Elsevier B.V. All rights reserved.
Synthesis, molecular docking and biological evaluation of novel bis-pyrazole derivatives for analgesic, anti-inflammatory and antimicrobial activities
作者:Prakash S. Nayak、B. Narayana、B. K. Sarojini、Jennifer Fernades、B. R. Bharath、L. N. Madhu
DOI:10.1007/s00044-015-1467-9
日期:2015.12
AbstractA new series of bis-pyrazoles were synthesized by Michael addition of hydrazine to chalcones. The starting-material-substituted acetophenones required for the synthesis of chalcones were prepared from itaconic anhydride. The newly synthesized compounds were characterized by IR, 1H-NMR, 13C-NMR, mass spectral and analytical data. All the synthesized compounds were evaluated for in vivo analgesic