TY  - JOUR
A1  - Modarresi-Alam, Ali Reza
A1  - Khamooshi, Ferydoon
A1  - Rostamizadeh, Mohsen
A1  - Keykha, Hossein
A1  - Nasrollahzahdeh, Mahmoud
A1  - Bijanzadeh, Hamid-Reza
A1  - Kleinpeter, Erich
T1  - Dynamic 1H NMR spectroscopic study of the restricted S-N rotation in aryl-N-(arylsulfonyl)-N- (triphenylphosphoranylidene)imidocarbamates
N2  - Dynamic 1H NMR (500 MHz) investigation of aryl-N-(arylsulfonyl)-N-(triphenylphosphoranylidene)imidocarbamates in CDCl3, CD3COCD3, and CD3OD at the temperature range of 183-298 K is reported. The observed free energy barriers (almost 12 kcal mol;1) are attributed to conformational isomerization about the NùS bond and these barriers show very little solvent dependence.
Y1  - 2007
ER  - 
TY  - JOUR
A1  - Modarresi, Ali Reza
A1  - Najafi, Parisa
A1  - Rostamizadeh, Mohsen
A1  - Keykha, Hossein
A1  - Bijanzadeh, Hamid-Reza
A1  - Kleinpeter, Erich
T1  - Dynamic 1H NMR study of the barrier to rotation about the C-N bond in primary carbamates and its solvent dependence
N2  - The dynamic 1H NMR study of some primary carbamates in the solvents CDCl3 and CD3COCD3 between 183 and 298 K is reported. The free energies of activation, thus obtained (12.4 to 14.3 kcal mol-1), were attributed to the conformational isomerization about the N-C bond. These barriers to rotation show solvent dependence in contrast to the tertiary analogues and are lower in free energy by ca. 2-3 kcal mol-1.
Y1  - 2007
ER  -