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1): anthracene, 170.7; decacyclene, 168.3; pyrene, 171.3. From the Web-Book of the National Institute of Standards and Technology, http://webbook.nist.gov/chemistry.
-
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-
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56
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32944480665
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note
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Results for the cyclizatlon to five- or six-membered rings of the radicals formed upon deprotonation, which could be important intermediates when generated by other means, can be found in the Supporting Information.
-
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-
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57
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32944469558
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note
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13 9.
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59
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60
-
-
32944469855
-
-
note
-
+ and a relatively high natural atomic charge (+0.23) compared with those of all other C atoms (which show negative charges up to -0.38).
-
-
-
-
61
-
-
32944458199
-
-
note
-
.+ indicates that the positive charge is higher in the dehydrogenated carbon atoms (+0.24; the others are practically neutral or negatively charged up to -0.31). The natural electron configuration shows 3.74 valence electrons for each of these carbon atoms (instead of roughly four electrons for the others). The relatively localized radical character explains the fast formation of the new C-C bond from this intermediate.
-
-
-
-
62
-
-
32944463543
-
-
note
-
.+, we have just considered one of the possibilities for each intermediate, since the energies involved in the eliminations must be similar.
-
-
-
-
63
-
-
32944461646
-
-
note
-
1 in both cases, and the H-H distances are 2.16 and 2.22 Å, respectively.
-
-
-
-
64
-
-
32944470573
-
-
note
-
., and the hybridization is again close to sp by NBO analysis. The natural charge is even higher (+0.35).
-
-
-
|