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53
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65549113142
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note
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Cyclization did not proceed when the reaction was carried out at 80 °C.
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54
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1342345791
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Walton and co-workers also examined 4-exo-dig cyclization of carbamoyl radical generation from N-benzyl-N-alkynyl-(1-methyl)cyclohexa-2,5-diene-1-carboxamide, at 80 °C and mentioned that the only product isolated was formamide. However, the GC-MS chromatogram showed a small amount of α-alkylidene-β-lactam, although this was not confirmed by isolation and NMR spectral characterisation, see:
-
Walton and co-workers also examined 4-exo-dig cyclization of carbamoyl radical generation from N-benzyl-N-alkynyl-(1-methyl)cyclohexa-2,5-diene-1-carboxamide, at 80 °C and mentioned that the only product isolated was formamide. However, the GC-MS chromatogram showed a small amount of α-alkylidene-β-lactam, although this was not confirmed by isolation and NMR spectral characterisation, see:. Bella A.F., Jackson L.V., and Walton J.C. Org. Biomol. Chem. 2 (2004) 421
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Bella, A.F.1
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55
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65549171708
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note
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Carbamotelluroates 5 were completely comsumed in all runs. Complex mixtures were obtained and five-membered lactams were not detected except run 7.
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56
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0345293182
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For 5-endo-dig cyclization of carbon-centered radicals:
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For 5-endo-dig cyclization of carbon-centered radicals:. Johnson J.P., Bringley D.A., Wilson E.E., Lewis K.D., Beck L.W., and Matzger A.J. J. Am. Chem. Soc. 125 (2003) 14708
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24744453294
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For theoretical and experimental studies of 5-endo-dig cyclization:. Alabugin I.V., and Manoharan M. J. Am. Chem. Soc. 127 (2005) 9535
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Alabugin, I.V.1
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4644262961
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For 5-endo-dig cyclization of heteroatom-centered radicals:. Bartan T.J., and Groh B.L. J. Org. Chem. 50 (1985) 158
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65549114284
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-
-
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66
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65549170602
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note
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4), respectively, and found to be almost the same as that of Ab to Bb.
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71
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ref. 14
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ref. 14.
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