Chromium N-phosphinoamidine ethylene tri-/tetramerization catalysts: Designing a step change in 1-octene selectivity
作者:Takahiko Ogawa、Fabien Lindeperg、Mark Stradiotto、Laura Turculet、Orson L. Sydora
DOI:10.1016/j.jcat.2020.10.021
日期:2021.2
improve 1-octene selectivity in ethylene tri-/tetramerization chromium catalysis. Novel phosphole- and phospholane-based PN-ligands were prepared and used to synthesize discrete chromium complexes which were fully characterized. The highest 1-octene producing Cr/PN/MMAO catalyst system compares favorably with the benchmark Cr/PNP/MMAO system generating a higher overall product selectivity at equivalent
Polymer-supported phosphorus ligands for catalysts
申请人:——
公开号:US20030228629A1
公开(公告)日:2003-12-11
Novel phosphine and phosphine oxide ligands are prepared using polymeric supports. These compounds can be easily cleaved from the support, and along with the corresponding supported compounds, used as ligands in the preparation of novel, metal-complexed catalysts.
Triple-Decker Complexes. 13.<sup>1</sup> Synthesis of the First Triple-Decker Complexes with a Bridging Phospholyl Ligand. Structures of the Triple-Decker Complex [(μ-C<sub>4</sub>Me<sub>4</sub>P){Fe(C<sub>5</sub>Me<sub>4</sub>CH<sub>2</sub>C<sub>6</sub>H<sub>11</sub>)}(RuCp*)]CF<sub>3</sub>SO<sub>3</sub> and the Related Sandwich Complex Fe(C<sub>4</sub>Me<sub>4</sub>P)(C<sub>5</sub>Me<sub>4</sub>CH<sub>2</sub>C<sub>6</sub>H<sub>11</sub>)
作者:Gerhard E. Herberich、Beate Ganter
DOI:10.1021/om960985m
日期:1997.2.1
The stacking reaction of the phosphaferrocene Cp*Fe(C4Me4P) (1) with the metallo-electrophiles [Cp*Ru(solv)x]+ (solv = acetone, CH2Cl2) gives the 30e triple-decker complex [(μ-C4Me4P)(FeCp*)(RuCp*)]CF3SO3 (3), the first compound with a central phospholyl ligand. The cyclohexylmethyl derivative [(μ-C4Me4P)Fe(C5Me4CH2C6H11)}(RuCp*)]CF3SO3 (10) shows metal-to-phospholyl distances of 164.4(1) pm for Fe
Evidence for a SN2-Type Pathway for Phosphine Exchange in Phosphine–Phosphenium Cations, [R2PPR′3]+
作者:John M. Slattery、Cheryl Fish、Michael Green、Thomas N. Hooper、John C. Jeffery、Richard J. Kilby、Jason M. Lynam、John E. McGrady、Dimitrios A. Pantazis、Christopher A. Russell、Charlotte E. Willans
DOI:10.1002/chem.200601742
日期:2007.8.17
significantly in both their electronic and steric requirements. The high electrophilicity of the phosphorus center in [Et4C4P]+, combined with strong pi-pi interactions between the ring and the incoming and outgoing phenyl groups of PPh3, favours the SN2-type over the SN1-type pathway in [Et4C4P(PPh3)]+. Effective pi-donation from the amide groups reduces the intrinsic electrophilicity of [ArNCH2CH2N(Ar)P]+
Phosphorus–heteroatom bond cleavage by ytterbium metal. Synthesis of mono(η<sup>5</sup>-tetramethylphospholyl)ytterbium(<scp>II</scp>) chloride and thiolate complexes and structural characterisation of [Yb(µ-Cl)(η<sup>5</sup>-C<sub>4</sub>Me<sub>4</sub>P)(thf)<sub>2</sub>]<sub>2</sub>and [Yb(µ-SPh)(η<sup>5</sup>-C<sub>4</sub>Me<sub>4</sub>P)(thf)<sub>2</sub>]<sub>2</sub>
作者:Françis Nief、Louis Ricard
DOI:10.1039/c39940002723
日期:——
The structurally characterised [Yb(µ-Cl)(η5-C4Me4P)(thf)2]22 and [Yb(µ-SPh)(η5-C4Me4P)(thf)2]24 can be easily prepared by direct cleavage of the PâCl or PâS bonds of respectively 1-chloro- and 1-phenylthio-2,3,4,5-tetramethylphosphole by ytterbium metal in thf at room temperature, while 4 can also be prepared by reaction of 2 with NaSPh.