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Diphosphine Complexes (diphosphine + complex)

Distribution by Scientific Domains

Chemistry	100%

Selected Abstracts

Addition of the ortho-C,H Bonds of Phenol Across an Olefin Catalyzed by a Chiral Iridium(I) Diphosphine Complex.

CHEMINFORM, Issue 28 2003
Romano Dorta
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Enhanced Hydrogenation Activity and Recycling of Cationic Rhodium Diphosphine Complexes through the Use of Highly Fluorous and Weakly-Coordinating Tetraphenylborate Anions

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 5 2003
Broeke, Joep van
Abstract The effect of the nature of the anion on the performance of ionic rhodium catalysts has received little attention. Herein it is shown that the use of highly fluorous tetraphenylborate anions can enhance catalyst activity in both conventional and fluorous media. For hydrogenation catalysts of the type [Rh(COD)(dppb)][X] {COD=1,5- cis,cis -cyclooctadiene; dppb=1,4-bis(diphenylphosphino)butane; X=BF4, (1a), [BPh4], (1b), [B{C6H4(SiMe3)-4}4], (1c), [B{C6H3(CF3)2 -3,5}4], (1d), [B{C6H4(SiMe2CH2CH2C6F13)-4}4], (1e), [B{C6H4(C6F13)-4}4], (1f) and [B{C6H3(C6F13)2 -3,5}4], (1,g)} the activity towards the hydrogenation of 1-octene in acetone increased in the order 1c <1b <1e <1a <1d ~ 1f <1g with 1g being twice as active as the commonly applied 1a. Despite the fluorophilic character introduced by the substituted tetraarylborate anions, the presence of some perfluoroalkyl-substituents in the cation was still required for achieving high partition coefficients. Therefore, [Rh(COD)(Ar2PCH2CH2PAr2)][X] {Ar=C6H4(SiMe2CH2CH2C6F13)-4, X=[B{C6H3(C6F13)2 -3,5}4], (3f); Ar=C6H4(SiMe(CH2CH2C6F13)2)-4 and X=[B{C6H4(C6F13)-4}4], (2g)} were prepared, which were active in the hydrogenation of 1-octene, 2g even more so than 3f. Both these highly fluorous catalysts could be recycled with 99% efficiency through fluorous biphasic separation, whereas the corresponding BF4, complex of 2g (2a) did not show any affinity for the fluorous phase. [source]

Regioselective Cyclotrimerization of Phenylacetylenes to 1,2,4-Triarylbenzenes Catalyzed by Iridium,Diphosphine Complexes.

CHEMINFORM, Issue 21 2004
Erica Farnetti
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Asymmetric Sulfoxidation of Thioethers with Hydrogen Peroxide in Water Mediated by Platinum Chiral Catalyst

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 9 2005
Alessandro Scarso
Abstract Easy stereoselective oxidation of prochiral aryl alkyl sulfides 2 to the corresponding sulfoxides can be achieved in water-surfactant medium with inexpensive hydrogen peroxide mediated by the chiral platinum diphosphine complex {[(R)-BINAP]Pt(, - OH)}2(BF4)2 (1). Remarkable key features of general interest are (i) easy isolation of the products from catalyst by simple diethyl ether/water-surfactant two phase separation, (ii) catalyst loading as low as 1% mol, (iii) good yields, sulfoxide 3 to sulfone 4 ratio up to 200,:,1 and enantioselectivities up to 88%, (iv) mild experimental conditions. [source]

A new optically pure half-sandwich Cp,Ru diphosphine complex with a chiral metal centre, (S)-Ru(,5 -C5H5)(EPHOS)Cl {EPHOS is (+)-(1R,2S)-2-[(diphenylphosphino)methylamino]-1-phenylpropyl diphenylphosphinite}

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 11 2002
Pierre Haquette
The crystal structure of the title compound, chloro(,5 -cyclopentadienyl){(1R,2S)-2-[(diphenylphosphino)methylamino]-1-phenylpropyl diphenylphosphinite-,2P,P,}ruthenium(II), [Ru(C5H5)Cl(C34H33NOP2)], is reported. The pseudo-octahedral complex is chiral and the configuration at the Ru atom is S. The seven-membered metallacycle adopts a boat-like conformation. [source]