Please use this identifier to cite or link to this item:
|Title:||1,3-dipolar cycloadditions. Part XX. DFT study of the configuration and conformation of C-aryl-N-phenyl nitrones and their reactivities as 1,3-dipoles to methyl and ethyl crotonates|
|Keywords:||Theoretical chemistry;Density functional calculations;Cycloadditions;Dipolar cycloadditions;Electrophilicity index;Chemical shifts;NMR shielding tensors;Regioselectivity;Nitrones;Aryl phenyl nitrones|
|Abstract:||The preferred configurations and conformations of C-aryl-N-phenyl nitrones have been predicted theoretically by detailed comparison of DFT/B3LYP/6-311+G(2d,p) calculated gauge invariant atomic orbital nuclear magnetic shielding tensors and experimentally recorded chemical shift values. The frontier molecular orbital energies, electronic chemical potentials, chemical hardness, chemical softness and global electrophilicity indices of C-aryl-N-phenyl nitrones have been calculated at DFT/B3LYP/ 6-31+G(d,p) level of theory. Condensed Fukui functions and local electrophilicity indices have been computed to characterize the reactive sites and predict the preferred interactions of C-aryl-N-phenyl nitrones to methyl and ethyl crotonates. The softness matching indices have been evaluated to determine the regioselectivity of the cycloaddition reactions. The theoretical predictions were found to be in complete agreement with the experimental results implying that the DFT based reactivity indices correctly predict the regioselectivities of 1,3-dipolar cycloadditions of C-aryl-N-phenyl nitrones to methyl and ethyl crotonates.|
|Appears in Collections:||IJC-A Vol.49A(11) [November 2010]|
Files in This Item:
|IJCA 49A(11) 1444-1452.pdf||265.7 kB||Adobe PDF||View/Open|
Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.