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An initial screen of the reaction of 2-phenylpyridine with NCS in 11 different solvents revealed that the highest yields were obtained in MeCN and AcOH. As a result, further investigations focused on these two solvents.
-
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57
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2 in AcOH afforded traces (5% by GC) of a monochlorinated product.
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Notably, bromination of 1 with NBS (and bromination reactions in general) proceeded in lower yield than the analogous chlorinations or iodinations. The yield was independent of the source or quality (recrystallized versus nonrecrystallized) of the NBS. The predominant side products appeared to be traces of the corresponding dibrominated product along with mixtures of oxidatively coupled arylpyridines (dimers of 1, heterodimers of 1 with 1-Br, etc.). Interestingly, no acetoxylated side products were observed with NBS, even in AcOH.
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61
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2. See ref 15a.
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33745551292
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2 in the reaction of 1 with NXS resulted in somewhat lower yields of 1-Cl, 1-Br, and 1-I (60%, 41%, and 77% GC yield, respectively).
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33745549669
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note
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GC analysis of the isolated product showed ∼10% of a regioisomeric product both with and without Pd.
-
-
-
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