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IJC-A Vol.48A(12) [December 2009] >


Title: 1,3-Dipolar cycloadditions. Part XVII: Experimental and theoretical spectroscopic investigations of C-aryl-N-methyl nitrones
Authors: Acharjee, Nivedita
Banerji, Avijit
Banerjee, Manas
Das, Tapas K
Keywords: Theoretical chemistry
Dipolar cycloadditions
Cycloadditions
NMR spectroscopy
Nitrones
Issue Date: Dec-2009
Publisher: CSIR
Abstract: Detailed experimental and theoretical spectroscopic studies of C-aryl-N-methyl nitrones have been reported. The optimized geometries have been calculated by DFT/B3LYP level of theory with 6-31+G(d,p) basis set. The theoretically computed frontier orbital energy gaps and TDDFT calculations (calculated at B3LYP level with 6-31+G(d,p) basis set) of C-phenyl-N-methyl nitrone in different solvents are in good agreement with the UV spectral absorptions. This agreement reveals that the FMO energies can be well utilized to rationalize the observed regioselectivities of this and related nitrones in 1,3-dipolar cycloadditions and also their relative reactivities compared to other 1,3-dipoles. The fundamental vibrational modes of C-phenyl-N-methyl nitrone have been assigned by comparing the theoretical (calculated at B3LYP level with 6-311++G(d,p) basis set) and experimental frequencies. The thermodynamic parameters (which are generally used to rationalize the observed stereo- and regioselectivities of 1,3-dipolar cycloadditions of nitrones) have been calculated for C-phenyl-N-methyl nitrone at 6-311++G(d,p) level of theory. The preferred configuration and conformation predicted by theoretical 1H NMR studies of C-aryl-N-methyl nitrones coincides with that obtained from the dipole moment measurements and experimentally recorded 1H NMR chemical shifts.
Page(s): 1627-1637
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.48A(12) [December 2009]

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