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0345890211
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note
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2Mg bridged isomers were confirmed to be less stable than 6 or 13, respectively.
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0345890210
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note
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When the Mg - O distance is decreased, the Mg - C distance is enlarged gradually. The partial optimizations with a fixed Mg - O distance were repeated, and a complex potential surface with various extremely shallow energy minima was found. A local minimum with smaller relative energy than that (=8.5 kcal/mol) of 23 (TS) was sought. However, the attempted geometry converged to that of 24 probably due to the complex potential curve and spin contamination, and 24 was calculated to be slightly less stable than 23 (TS).
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-
37
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1542415010
-
-
The second Mg - O approach is possible via a route corresponding to 8 → 10 → 12 in Figure S2. A symmetric singlet-spin radical geometry 25 was obtained. Since four radical centers are distant with each other, triplet and quartet spin states have almost the same energies as that of the open singlet (25). The triplet or quartet radicals have also the same symmetric structures as that of 25. The triplet or quartet radicals would be related to intermediates detected by ESR spectroscopy (ref 1h and (a) Maruyama, K.; Hayashi, J.; Takagiri, T. Chem. Lett. 1987, 731. (b) Maruyama, K. Bull. Chem. Soc. Jpn. 1964, 37, 897).
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38
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0346521080
-
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The second Mg - O approach is possible via a route corresponding to 8 → 10 → 12 in Figure S2. A symmetric singlet-spin radical geometry 25 was obtained. Since four radical centers are distant with each other, triplet and quartet spin states have almost the same energies as that of the open singlet (25). The triplet or quartet radicals have also the same symmetric structures as that of 25. The triplet or quartet radicals would be related to intermediates detected by ESR spectroscopy (ref 1h and (a) Maruyama, K.; Hayashi, J.; Takagiri, T. Chem. Lett. 1987, 731. (b) Maruyama, K. Bull. Chem. Soc. Jpn. 1964, 37, 897).
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