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PEG-400 [poly(ethylene glycol-400)] was found to improve the Pd(OAc) 2 /DABCO-catalyzed aqueous Suzuki–Miyaura and Stille cross-coupling reactions. In the presence of Pd(OAc) 2 , DABCO, and PEG-400, a variety of aryl halides were coupled with arylboronic acids or organotin compounds efficiently to afford the corresponding cross-coupled products in moderate to excellent yields. The...
An efficient palladium-catalyzed Stille cross-coupling reaction has been developed. In the presence of 3mol% of Pd(dba) 2 and 6mol% of DAB-Cy (1,4-dicyclohexyl-diazabutadiene), various aryl halides (iodides and bromides) were coupled with organotin compounds to afford the corresponding biaryls and alkyne in good to excellent yields. Furthermore, high TONs [turnover numbers, TONs up to 950,000...
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