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Small molecule substrate specificity in the Cu-free Sonogashira cross-coupling reaction with Ub-R1–4. Top, reaction scheme; bottom, small-molecule substrate structures and their respective yields in the Cu-free Sonogashira cross-coupling reactions toward Ub-R1–4 and Ub-G4 (listed in parentheses; data taken from ref (21)). The product yield was determined using LC-MS as described previously. For Ub-G4, 50 equiv of the aryl/vinyl iodide-palladium complexes was used.
