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[8b] only a 46% yield of 13b was obtained. The use of the phase-transfer conditions reported in Table 1, entry 3 for substrate 12c gave 13c in only 24% yield
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[8b] only a 46% yield of 13b was obtained. The use of the phase-transfer conditions reported in Table 1, entry 3 for substrate 12c gave 13c in only 24% yield.
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No attempt was made to optimize the reaction conditions
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77955795278
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In particular, an acetylene C-H signal was now visible at δ=3.50 ppm. See Figure S1 in the Supporting Information
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In particular, an acetylene C-H signal was now visible at δ=3.50 ppm. See Figure S1 in the Supporting Information.
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65
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77955837930
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In the case of slower-reacting substrates, partial decomposition of EBX was also observed
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In the case of slower-reacting substrates, partial decomposition of EBX was also observed.
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66
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77955834307
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For reasons of synthetic accessibility, the labeled TIPS-EBX reagent 18 was used. Generally, TIPS-EBX (1) was as efficient as TMS-EBX (2) as the reagent precursor, although the silyl-group removal was slightly slower
-
For reasons of synthetic accessibility, the labeled TIPS-EBX reagent 18 was used. Generally, TIPS-EBX (1) was as efficient as TMS-EBX (2) as the reagent precursor, although the silyl-group removal was slightly slower.
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