A Highly Regioselective Palladium-Catalyzed Hydrophosphination of Alkynes Using a Diphosphine−Hydrosilane Binary System
摘要:
A novel transition-metal-catalyzed hydrophosphination of terminal alkynes using a diphosphine-hydrosilane binary system takes place regioselectively to provide vinylic phosphines, which undergo air oxidation during workup, affording the corresponding vinylphosphine oxides in good yields. In this hydrophosphination, hydrosilanes act as a useful hydrogen source, and furthermore, small amounts of oxygen is required to accomplish the reaction efficiently.
We report the stereochemistry of reactions of various nucleophiles with opticallyactive silyl esters of phosphorus of general formula: tBuPhP(X)OSiMePhNp (X = −(1), Oxygen (2), Sulfur (3), Selenium (4). The list of nucleophiles includes O,S,N,C nucleophiles as well as halides. The nucleophilic attack is essentially directed towards silicon. The phosphinous and phosphonic acid esters react with predominant
Synthesis and characterization of new (<i>N</i>-diphenylphosphino)-isopropylanilines and their complexes: crystal structure of (Ph<sub>2</sub>P<b></b>S)NHC<sub>6</sub>H<sub>4</sub>4CH(CH<sub>3</sub>)<sub>2</sub>and catalytic activity of palladium(II) complexes in the Heck and Suzuki cross-coupling reactions
selenides (Ph2PE)NHC6H42‐CH(CH3)2, (Ph2PE)NHC6H44‐CH(CH3)2 and (Ph2PE)NHC6H42,6‐CH(CH3)2}2, where E = O, S, or Se, respectively. The reaction of [M(cod)Cl2] (M = Pd, Pt; cod = 1,5‐cyclooctadiene) with two equivalents of 1,2 or 3 yields the corresponding monodendate complexes [M((Ph2P)NHC6H42‐CH(CH3)2)2Cl2], M = Pd 1d, M = Pt 1e, [M((Ph2P)NHC6H44‐CH(CH3)2)2Cl2], M = Pd 2d, M = Pt 2e and [M((Ph2P)NHC6H42
Zur disproportionierung der phenylfluorphosphane (C6H5)2PF und (C6H5)PF2
作者:L. Riesel、J. Haenel、G. Ohms
DOI:10.1016/s0022-1139(00)81069-6
日期:1988.3
Ph2P-PF2Ph2 has been identified by means 19F- and 31P- NMR spectroscopy as an intermediate product of the disproportionation of Ph2PF. The disproportionation is catalyzed by acids. The reaction mechanism is discussed. PhPF2 disproportionates faster in solution in acetonitrile than neat, forming (PhP)6, instead of (PhP)5.
Phosphane Ligands with Enaminoketone Scaffold and their Palladium Complexes
作者:Michael Schmidt、Jürgen Heck
DOI:10.1002/zaac.201200070
日期:2012.6
with different chlorodiorganylphosphanes established three new ligands composed of a hard and soft coordination site. The soft phosphane site is easily coordinated to palladium(II) as a first step in the potential formation of heterodinuclearcomplexes. Surprisingly, the formed square-planar dichloridopalladium(II) complexes exhibit exclusively trans configuration. A cis configurated palladium(II) complex
(Z)-4-aminopent-3-en-2-one 与不同氯二有机基膦的反应建立了三个由硬配位点和软配位点组成的新配体。软磷烷位点很容易与钯 (II) 配位,这是潜在形成异双核复合物的第一步。令人惊讶的是,形成的方形平面二氯钯 (II) 配合物仅表现出反式构型。当磷烷和烯氨基酮单元之间的接头扩大并允许更大的灵活性时,可以形成顺式构型的钯 (II) 复合物。(Z)-4-(2'-羟乙基氨基)pent-3-en-2-one 和氯代二有机基膦之间的反应揭示了两个与钯 (II) 配位的新配体。在磷原子上有苯基取代基,得到顺式钯配合物,而对于异丙基取代基,则形成了反式配合物。通过单晶 X 射线衍射分析所有配合物的分子结构。
Calcium-centred phosphine oxide reactivity: P–C metathesis, reduction and P–P coupling
作者:Michael S. Hill、Mary F. Mahon、Thomas P. Robinson
DOI:10.1039/b923172b
日期:——
Reactions of triphenylphosphineoxide and diphenylphosphine oxide with calcium alkyls and amides in the presence of PhSiH(3) occur to give P-Cbondcleavage, P(V) to P(III) reduction and P-P coupling.