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1H resonances were observed, indicating that interconversion of the conformers occurred at ambient temperature in the NMR time scale. We consider that both the aryl group and the chlorine atom occupy axial positions in one conformer of 21a or 21b, whereas those does equatorial positions in the other conformer.
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note
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We carried out crystallographic analysis of 24a and 24b. The molecular structure of 24a showed that very effective resonance stabilization provided that six atoms, C2, C1, O1, N1, C3, and C6, lie on the same plane in the molecular structure of 24a. The C-O distance is substantially longer than the usual C=O distances, whereas the N-CO bond length is shorter than normal N-C single bond distances (N-CO; 1.35 Å (1), C+O.; 1.24 Å (1)). Thus, the N-CO bond of 24a has a considerable double-bond character like A. Since X-ray analysis of 24b did not converge well (R = 7.7%), precise comparison of the structure of 24b with that of 24a is difficult. However, it is noteworthy that the molecular structure suggested a single bond character of N-CO bond (N-CO; 1.375 Å (4), C=O.; 1.195 Å (1)). Five atoms, C1, N1, C3, S1, and 03, lie on the same plane, which makes an angle of 13° with a plane consisting of C2, C1, and O1. We consider that the resonance structure shown as B is responsible for facile rotation of the CO-N bond in 24b. (Matrix Presented)
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60
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0032861740
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The importance of the electron-withdrawing group on the nitrogen atom has recently reported by Giese et al. in the photocyclization of o-aminophenyl ketones: Seiler, M.; Schumacher, A.; Lindemann, U.; Barbosa, F.; Giese B. Synlett 1999, 1588.
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