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5-(Di-tert-butylphosphino)-1', 3', 5'-triphenyl-1'H-[1,4']bipyrazole is a non-proprietary ligand for palladium-catalyzed amination of aryl halides including aryl chlorides. Works best when the palladium source is Pd2(dba)3
Saravanan Gowrisankar; Alexey G Sergeev; Pazhamalai Anbarasan; Anke Spannenberg; Helfried Neumann; Matthias Beller. A general and efficient catalyst for palladium-catalyzed C-O coupling reactions of aryl halides with primary alcohols. . Journal of the American Chemical Society. 2010 132(33), 11592-11598.
Brian J Kotecki; Dilinie P Fernando; Anthony R Haight; Kirill A Lukinr. A general method for the synthesis of unsymmetrically substituted ureas via palladium-catalyzed amidation. Organic Letters. 2009. 11(4), 947-950.