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DFT calculations at the level of B3LYP1/6-31G(d) were performed by Firefly (PC GAMESS) quantum chemical package (version 7.1.G, Alex A. Granovsky, Firefly version 7.1.G, www http://classic.chem.msu.su/gran/firefly/index.html). All structures were fully optimized and then subjected to the frequency analysis. For the ground state, the absence of the imaginary frequency was confirmed in every case. Transition states relevant to the rotational barrier were identified by the following two criteria: (1) The frequency analysis gave only one imaginary frequency. (2) The exhaustive IRC calculations provided one pair of enantiomeric atropisomers. Schmidt, M. W.; Baldridge, K. K.; Boatz, J. A.; Elbert, S. T.; Gordon, M. S.; Jensen, J. H.; Koseki, S.; Matsunaga, N.; Nguyen, K. A.; Su, S.; Windus, T. L.; Dupuis, M.; Montgomery, J. A.; J. Comput. Chem. 1993, 14, 1347.
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