Table 2.
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[a] Conversion was determined by 1H NMR measurements. Reaction conditions for 1H NMR yield: 1 (0.05 mmol) phenolic derivative 2 (1.05 equiv) and DBU (1.0 equiv) in CD3CN (0.55 mL), rt. [b] Hydrolysis by‐product was formed (see SI). [c] 2 equiv of DBU were used.