In an article, published in an article, once mentioned the application of 161265-03-8, Name is (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine),molecular formula is C39H32OP2, is a conventional compound. this article was the specific content is as follows.Formula: C39H32OP2
Treatment of Ru(PPh3)3HCl with the pincer phosphines 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (xantphos), bis(2- diphenylphosphinophenyl)ether (DPEphos), or (Ph2PCH 2CH2)2O affords Ru(P-O-P)(PPh3)HCl (xantphos, 1a; DPEphos, 1b; (Ph2PCH2CH2) 2O, 1c). The X-ray crystal structures of 1a-c show that all three P-O-P ligands coordinate in a tridentate manner through phosphorus and oxygen. Abstraction of the chloride ligand from 1a-c by NaBAr4F (BAr4F = B(3,5-C6H3(CF 3)2)4) gives the cationic aqua complexes [Ru(P-O-P)(PPh3)(H2O)H]BAr4F (3a-c). Removal of chloride from 1a by AgOTf yields Ru(xantphos)(PPh3)H(OTf) (2a), which reacts with water to form [Ru(xantphos)(PPh3)(H 2O)H](OTf). The aqua complexes 3a-b react with O2 to generate [Ru(xantphos)(PPh3)(eta2-O2)H] BAr4F (5a) and [Ru(DPEphos)(PPh3) (eta2-O2)H]BAr4F (5b). Addition of H2 or N2 to 3a-c yields the thermally unstable dihydrogen and dinitrogen species [Ru(P-O-P)(PPh3)(eta2-H 2)H]BAr4F (6a-c) and [Ru(P-O-P)(PPh 3)(N2)H]BAr4F (7a-c), which have been characterized by multinuclear NMR spectroscopy at low temperature. Ru(PPh3)3HCl reacts with 1,1?-bis(diphenylphosphino) ferrocene (dppf) to give the 16-electron complex Ru(dppf)(PPh3)HCl (1d), which upon treatment with NaBAr4F, affords [Ru(dppf){(eta6-C6H5)PPh2}H] BAr4F (8), in which the PPh3 ligand binds eta6 through one of the PPh3 phenyl rings. Reaction of 8 with CO or PMe3 at elevated temperatures yields the 18-electron products [Ru(dppf)(PPh3)(CO)2H]BArF4 (9) and [Ru(PMe3)5H]BAr4F (10).
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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate