5-(Di-tert-butylphosphino)-1',3',5'-triphenyl-1'H-1,4'-bipyrazole
http://www.cosmoscience.org/shop/fm-3b-b6221-5-di-tert-butylphosphino-1-3-5-triphenyl-1-h-14-bipyrazole-35214
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5-(Di-tert-butylphosphino)-1',3',5'-triphenyl-1'H-1,4'-bipyrazole 1g : Bulky phosphine ligand for selective transition-metal catalysis.
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