Synthesis, IR spectra, crystal structure and DFT studies on 1-acetyl-3-(4-chlorophenyl)-5-(4-methylphenyl)-2-pyrazoline

Vibrational spectra, HOMO, LUMO, MESP surfaces and reactivity descriptors of amylamine and its isomers: A DFT study

Amylamine constitutes an important class of organic compounds which exists in a variety of ammonia derivatives. In present study, a comparative analysis of amylamine and its two potential isomers, iso-amylamine and tert-amylamine, has been performed using density functional theory with B3LYP method and 6-311G(d,p) as the basis set. The equilibrium structures of amylamine as well as its iso and tert forms have been obtained. The vibrational spectroscopic analysis has been carried out for the three molecules and complete assignments to all possible modes have been offered. The HOMO, LUMO and MESP surfaces are analyzed to discuss the chemical reactivity patterns in the molecules. A number of reactivity parameters have been calculated to further explain their chemical reactivity. The thermodynamic and nonlinear optical parameters are also calculated and discussed.

NMR spectroscopic characterization of new 2,3-dihydro-1,3,4-thiadiazole derivatives

The (1) H and (13) C NMR resonances of twenty-seven 2,2-dimethyl-5-(2-nitrophenyl-5-substituted)-2,3-dihydro-1,3,4-thiadiazoles, and twenty-seven 3-acyl-5-(2-amino-5-substituted)-2,2-dimethyl-2,3-dihydro-1,3,4-thiadiazoles were assigned completely using the concerted application of one-dimensional and two-dimensional experiments (DEPT, HMQC and HMBC). NOESY experiments, X-ray crystallography and conformational analysis confirm the preferred conformation of these compounds.

Characterization of 4,5-dihydro-1H-pyrazole derivatives by (13) C NMR spectroscopy

The (13)  C NMR resonances of 19 1-acyl-3-(2-nitro-5-substitutedphenyl)-4,5-dihydro-1H-pyrazoles, and 19 1-acyl-3-(2-amino-5-substituted)-4,5-dihydro-1H-pyrazoles, were completely assigned using the concerted application of one- and two-dimensional NMR experiments (DEPT, gs-HSQC and gs-HMBC).