4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene
http://www.cosmoscience.org/shop/fm-3b-b2709-45-bis-diphenylphosphino-99-dimethylxanthene-39582
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4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene 1g : High-performance bidentate ligand for Rh, Pd, and Ni catalysis.
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