"Unsymmetrical Diaryl Sulfones through Palladium-Catalyzed Coupling of Aryl Boronic Acids and Arylsulfonyl Chlorides"
B. P. Bandgar, Sampada V. Bettigeri, and Jaywant Phopase
Org. Lett., 2004, 6 (13), pp 2105–2108
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http://dx.doi.org/10.1021/ol049692c