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note
-
Anhydrous (commercial) ether was used. Extraction with reagent grade ether leads to the "leaching" of the succinimide likely due to water and ethanol contents. This step is obviously not necessary for reaction with ICl.
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73
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note
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3) gave a colorless fraction. Solvent was removed by rotary evaporation and the residue was dried by oil vacuum pump to give 5a as a white solid (0.238 g, 0.760 mmol. 89%). The compound can be recrystallized from methanol.
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74
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18844376271
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77
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18844366067
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note
-
A mechanistic pathway may include cyclization followed by a deprotonation (right structure) or α-hydrogen abstraction (left structure). (Chemical Equation Presented)
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78
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18844400497
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Crystallographic data (excluding structural factors) for the structure reported in this paper were also deposited with Cambridge Crystallographic Data Centre as supplementary publication no. CCDC-265867. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, by e-mailing data_request@ccdc.cam.ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, U.K.; fax: +44(0)1223-336033.
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