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Recyclable and reusable Pd(OAc)2/PPh3/PEG‐2000 system for homocoupling reaction of arylboronic acids under air without base

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A stable and efficient Pd(OAc)2/PPh3/PEG‐2000 catalytic system for homocoupling of arylboronic acids has been developed. In the presence of Pd(OAc)2 and PPh3, the homocoupling reaction of arylboronic acids was carried out smoothly in PEG‐2000 at 70 °C under air without base to afford a variety of symmetric biaryls in good to excellent yields. The isolation of the products was readily performed by extraction with diethyl ether, and the Pd(OAc)2/PPh3/PEG‐2000 system could be easily recycled and reused six times without significant loss of catalytic activity. Copyright © 2014 John Wiley & Sons, Ltd. An efficient and green method for the synthesis of symmetric biaryls has been developed involving the Pd(OAc)2/2PPh3‐catalyzed homocoupling reaction of arylboronic acids in PEG‐2000 under air without base. The reactions generated a variety of symmetric biaryls in good to excellent yields and the Pd(OAc)2/PPh3/PEG‐2000 system could be easily recycled and reused six times without significant loss of catalytic activity.
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Keywords: PEG‐2000; arylboronic acid; green chemistry; palladium; symmetric biaryl

Document Type: Research Article

Publication date: February 1, 2015

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