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24644498899
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The 2D NMR spectra (HMQC and HMBC) were measured for the product 2 f (Table 3), and peak assignments were unambiguously carried out for the compound.
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1842841039
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24644447687
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This compound was prepared by a different method (see the Experimental Section).
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We confirmed the stability of the alkyne 4n under the reaction conditions. The instability of 4d under basic conditions may be attributed to the relatively high acidity of the benzylic proton. In case of 4n, on the other hand, such deprotonation-decomposition reactions would be impeded by the influence of the two ortho substituents.
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24644433198
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note
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The yields were calculated based on the amount of consumed salicylaldehyde. Remaining salicylaldehyde could be removed simply by alkaline extraction: see the Experimental Section.
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53
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24644493643
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The preparative method for the deuterated salicylaldehyde was described in the Experimental Section.
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66
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24644470851
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1 H NMR spectroscopy.
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