449214-08-8Relevant articles and documents
Palladium-metalated porous organic polymers as recyclable catalysts for chemoselective decarbonylation of aldehydes
Li, Wen-Hao,Li, Cun-Yao,Li, Yan,Tang, Hai-Tao,Wang, Heng-Shan,Pan, Ying-Ming,Ding, Yun-Jie
, p. 8446 - 8449 (2018)
A novel palladium nanoparticle (NP)-metalated porous organic ligand (Pd NPs/POL-xantphos) has been prepared for the chemoselective decarbonylation of aldehydes. This heterogenous catalyst not only has excellent catalytic activity and chemoselectivity, but also holds high activity after 10 runs of reuse. The effective usage of this method is demonstrated through the synthesis of biofuels such as furfuryl alcohol (FFA) via the highly chemoselective decarbonylation of biomass-derived 5-hydroxy-methylfurfural (HMF) with a TON up to 1540. More importantly, 9-fluorenone could be obtained in one step through the decarbonylation of 2-bromobenzaldehyde by using this heterogeneous catalyst.
Xantphos Doped POPs-PPh3 as Heterogeneous Ligand for Cobalt-Catalyzed Highly Regio- and Stereoselective Hydrosilylation of Alkynes
Li, Ren-Hao,Zhang, Guo-Liang,Dong, Jia-Xing,Li, Ding-Chang,Yang, Ying,Pan, Ying-Ming,Tang, Hai-Tao,Chen, Li,Zhan, Zhuang-Ping
, p. 149 - 154 (2018/12/05)
A Co(acac)2/POL-Xantphos@10PPh3-catalyzed hydrosilylation of unsymmetrical internal alkynes with Ph2SiH2 has been developed for the synthesis of highly selective syn-α-vinylsilane products. Furthermore, terminal alkynes were also used and gave the products with excellent regioselectivity and a wide functional group tolerance. Because this porous organic polymer combines the selectivity and activity merits of Xantphos with the stability advantage derived from the high concentration of PPh3, the Co(acac)2/POL-Xantphos@10PPh3 can be recycled multiple times without loss of activity and selectivity. This heterogeneous catalyst is expected to find promising applications in industrial synthesis.
Novel Compound, Novel Ligand, Novel Transition Metal Complex, and Catalyst Including Novel Transition Metal Complex
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Paragraph 0097; 0098, (2014/01/08)
The invention provides novel ligands for transition metal complexes which exhibit high coordination power with respect to metals by being free of substituents at the positions ortho to phosphorus or arsenic and which have electron-withdrawing power comparable to the highest level known in conventional ligands. A ligand of the invention includes a compound represented by General Formula (1): R1R2R3A or General Formula (2): R1R2A-Y-AR3R4 and having a total of 15 to 110 carbon atoms. In the formulae, A is phosphorus or arsenic; R1, R2, R3 and R4 are each independently a substituted pyridyl group having optionally different electron-withdrawing groups bonded to the positions meta to the atom A as well as hydrogen atoms bonded to the positions ortho to the atom A; and Y is a divalent group derived from a C2-20, optionally substituted and optionally heteroatom-containing, aliphatic, alicyclic or aromatic compound or from ferrocene.
Cooperative ligand effects in phase-switching homogeneous catalysts
Mokhadinyana, Molise,Desset, Simon L.,Williams, D. Bradley G.,Cole-Hamilton, David J.
scheme or table, p. 1648 - 1652 (2012/05/05)
It takes two: Xantphos ligands that contain amidate groups are selective for the linear versus the branched-chain products in the rhodium-catalyzed hydroformylation of 1-octene. However, the catalyst only undergoes CO 2-mediated phase switching in the presence of amidine-substituted triphenylphosphine (see scheme). Copyright
The coordination behaviour of large natural bite angle diphosphine ligands towards methyl and 4-cyanophenylpalladium(II) complexes
Zuideveld, Martin A.,Swennenhuis, Bert H. G.,Boele, Maarten D. K.,Guari, Yannick,Van Strijdonck, Gino P. F.,Reek, Joost N. H.,Kamer, Paul C. J.,Goubitz, Kees,Fraanje, Jan,Lutz, Martin,Spek, Anthony L.,Van Leeuwen, Piet W. N. M.
, p. 2308 - 2317 (2007/10/03)
The structures of neutral and ionic 4-cyanophenylpalladium(II) and methylpalladium(II) complexes containing bidentate phosphine ligands were investigated in solution and in the solid state. Diphosphine ligands with a xanthene and a ferrocene backbone were used. New bis(dialkylphosphino) substituted Xantphos ligands were synthesised. 1H NMR and 31P NMR spectroscopy, conductivity measurements, UV-Vis spectroscopy, and X-ray crystallography were used to elucidate the structures of the complexes. Subtle changes of the phosphine ligands govern the coordination mode of the ligand. A variety of bidentate cis-, and trans-coordination and terdentate P-O-P, P-S-P and P-Fe-P coordination modes of the ligands were observed.
