Conversion of Dibenzoxaphosphinines into 2-Hydroxybiphenyl-2′-ylphosphane Ligands and Their BH3 Adducts: The O-Hδ+···Hδ--B Hydrogen-Hydrogen Bond
作者:Piotr Wawrzyniak、Markus K. Kindermann、Joachim W. Heinicke、Peter G. Jones
DOI:10.1002/ejoc.201001242
日期:2011.1
were converted into air-stable borane adducts 6. The latter were unable to undergo O-acylation. Acylation of 5 followed by borane protection afforded O-acyloxybiphenylylphosphane-borane adducts, as demonstrated by the formation of compounds 7a and 8a. X-ray crystal structure analyses revealed intermolecular O-H center dot center dot center dot H-B hydrogen-hydrogen bonds; for compound 6b the average H
Chiral Rh phosphine–phosphite catalysts immobilized on ionic resins for the enantioselective hydrogenation of olefins in water
作者:P. Kleman、P. Barbaro、A. Pizzano
DOI:10.1039/c5gc00485c
日期:——
Rh phosphine–phosphite chiral catalysts immobilized on ion exchange resins provide highly enantioselective hydrogenation of enamides in water.
Rh膦-膦酯手性催化剂固定在离子交换树脂上,在水中提供高度对映选择性的烯酰胺加氢。
Iron-Catalyzed Regiodivergent Hydrostannation of Alkynes: Intermediacy of Fe(IV)–H versus Fe(II)–Vinylidene
作者:Jianguo Liu、Heng Song、Tianlin Wang、Jiong Jia、Qing-Xiao Tong、Chen-Ho Tung、Wenguang Wang
DOI:10.1021/jacs.0c11448
日期:2021.1.13
iron-aryloxide catalyst (2, X = O-, R = Cy) affords an iron(II) vinylidene intermediate, allowing for gem-addition of the Sn-H to the terminal-carbon producing β-vinylstannanes. These catalytic reactions exhibit excellent regioselectivity and broad functional group compatibility and enable the large-scale synthesis of diverse vinylstannanes. Many new reactions have been established based on such a synthetic
我们报告了一种铁系统 Cp*Fe(1,2-R2PC6H4X),它通过调节离子金属-杂原子键 (Fe-X) 的反应性来控制炔烃的马尔科夫尼科夫和反马尔科夫尼科夫氢氢化。将 nBu3SnH 依次添加到铁-酰胺基催化剂 (1, X = HN-, R = Ph) 中提供了二锡基 Fe(IV)-H 物种,负责跨 C≡C 键的 Sn-H 键的顺式加成生产支链α-乙烯基锡烷。通过芳基氧化铁催化剂 (2, X = O-, R = Cy) 活化炔烃的 C(sp)-H 键,得到亚乙烯基铁 (II) 中间体,允许 Sn-H 与产生β-乙烯基锡烷的末端碳。这些催化反应表现出优异的区域选择性和广泛的官能团兼容性,能够大规模合成多种乙烯基锡烷。
Synthesis of hydroxylated oligoarene-type phosphines by a repetitive two-step method
作者:Shunpei Ishikawa、Kei Manabe
DOI:10.1016/j.tet.2009.10.101
日期:2010.1
oligoarene-type phosphines with various substitution patterns were synthesized. Such phosphines have potential as ligands for transition metal-catalyzed reactions. A successful route, which includes a repetitive Suzuki–Miyaura coupling–triflation sequence, reduction, and salt formation, was established starting from 2-bromophenyldicyclohexylphosphine oxide. Other key aspects of the method are the use of
Alkyne Metathesis with d<sup>2</sup>Re(V) Alkylidyne Complexes Supported by Phosphino-Phenolates: Ligand Effect on Catalytic Activity and Applications in Ring-Closing Alkyne Metathesis
作者:Mingxu Cui、Herman H. Y. Sung、Ian D. Williams、Guochen Jia
DOI:10.1021/jacs.2c00368
日期:2022.4.13
Re(V) alkylidyne complexes bearing two decorated phosphino-phenolates (POs) and a labile pyridine ligand were prepared that can efficiently promote alkyne metathesis reactions in toluene. The relative activity of these complexes varies with the PO ligands. Complexes with an electron-rich metal center have a higher activity. Ligand exchange experiments suggest that the pyridine ligands of the Re(V) alkylidynes
A family of d2 Re(V) alkylidyne complexes bearing two decorated phosphino-phenolates (POs) and a labile pyridine ligand were prepared that can efficiently promote alkyne metathesis reactions in toluene. The relative activity of these complexes varies with the PO ligands. Complexes with an electron-rich metal center have a higher activity. Ligand exchange experiments suggest that the pyridine ligands