Synthesis of New Schiff Base Compounds and Identification of Their Structures

Abstract

Schiff bases (imines) have been frequently used in various fields such as medicine, pharmaceutical purposes due to their various biological properties. In this study, nine new imine compounds (3a-h) were synthesized from 1-naphthyl amine with aromatic aldehydes in MeOH and their chemical structures were defined by 1H/13C NMR, IR and elemental analysis studies. We observed a singlet one hydrogen of the imines (-CH=N-) at 8.56-8.86 ppm in the 1H NMR spectra and also carbon of the Schiff bases (-CH=N-) at 158.2-163.4 ppm in the 13C NMR spectra. Also the IR spectra displayed the (-C=N-) characteristic absorption band at around 1600 cm-1. The obtained characteristic peaks at the expected locations proved the structural accuracy of the synthesized new derivative Schiff bases.

Synthesis and characterization of some Schiff bases derived from orthophthalaldehyde and their bridged complexes with Co (II) and Ni (II) as corrosion inhibitors for carbon steel in acidic medium

“…The study revealed the presence of multiple signals within the range of 6.74-8.56 ppm, corresponding to the number of protons in the prepared ligands, attributed to the aromatic protons. Additionally, a singlet signal at 8.57 and 9.02 ppm was observed, corresponding to the azomethine proton [18] in L1 and L2, respectively, as shown in Fig. 9 and Fig.…”

New Bioactive Aromatic Heterocyclic Macromolecules with Monosaccharide Core

“…TLC 3:1 n-hexane: ethyl acetate indicates the end of the reaction in about 10-12 hours. The mono-substituted indole precipitate after reducing solvent, filtered, washed, and dried (20)(21)(22). Two derivatives were synthesized in this step: 2) (0.15 g, 0.00035 mmol) was coupled with 2-deoxy-2-amino-D-glucose according to general procedure mentioned in step-1 above to yield yellow crystals of (2S,3S,4R,5S)-2- and S3).…”