Immobilization of optically active rhodium-diphosphine complexes on porous silica via hydrogen bonding was written by Bianchini, Claudio;Barbaro, Pierluigi;Dal Santo, Vladimiro;Gobetto, Roberto;Meli, Andrea;Oberhauser, Werner;Psaro, Rinaldo;Vizza, Francesco. And the article was included in Advanced Synthesis & Catalysis in 2001.SDS of cas: 37002-48-5 This article mentions the following:
The authors describe, for the 1st time, the supported hydrogen-bonded (SHB) immobilization of various optically pure Rh(I) diphosphine complexes, including [((R)-(R)-BDPBzPSO3)Rh(nbd)] (1), which contains the new chiral anionic ligand 4-((R)-Ph2PCHMe)2CHCH2C6H4SO3–, [((+)-DIOP)-Rh(nbd)]OTf (2), and [((S)-BINAP)Rh(nbd)]OTf (3) (nbd = norbornadiene). A preliminary study of the potential of the resulting SHB catalysts in the enantioselective hydrogenation of prochiral olefins is also reported. In the experiment, the researchers used many compounds, for example, (((4S,5S)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine) (cas: 37002-48-5SDS of cas: 37002-48-5).
(((4S,5S)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene))bis(diphenylphosphine) (cas: 37002-48-5) belongs to chiral phosphine ligands. Although many reactions require more nucleophilic trialkylphosphines as catalysts, only a few chiral trialkylphosphines are available. Indeed, very little research on chiral tertiary phosphine-catalyzed asymmetric reactions occurred prior to the year 2000.SDS of cas: 37002-48-5
Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis