Synthesis of lanthanide(II)–imine complexes and their use in carbon–carbon and carbon–nitrogen unsaturated bond transformation
作者:Ken Takaki、Kimihiro Komeyama、Katsuomi Takehira
DOI:10.1016/j.tet.2003.06.003
日期:2003.12
1 quantitatively, the structure of which was characterized by X-ray analysis. The imine complexes 1 catalyzed dehydrogenativesilylation of terminal alkynes, hydrosilylation of imines and alkenes, and intermolecular hydrophosphination of alkynes. Moreover, dehydrogenative double silylation of conjugated dienes was achieved with 1.
Yb[bond]imine complex, [Yb(eta(2)-Ph(2)CNPh)(hmpa)(3)], to give alkenylphosphines and phosphine oxides after oxidative workup in good yields under mild conditions. This reaction is also applicable to various carbon[bond]carbon multiple bonds such as conjugated diynes and dienes, allenes, and styrene derivatives. Regio- and stereoselectivity and the scope and limitation of the present reaction clearly
Hydrophosphorylation of Alkynes Catalyzed by Palladium: Generality and Mechanism
作者:Tieqiao Chen、Chang-Qiu Zhao、Li-Biao Han
DOI:10.1021/jacs.8b00550
日期:2018.2.28
H-phosphonates disfavored the addition. For H-phosphinates and secondary phosphine oxides, Pd/dppe/Ph2P(O)OH was the catalyst of choice, which led to highly regioselective formation of the Markovnikov adducts. By using Pd(PPh3)4 as the catalyst, hypophosphinic acid added to terminal alkynes to give the corresponding Markovnikov adducts. Phosphinic acids, phosphonic acid, and its monoester were not applicable
Outer-Sphere Reactivity Shift of Secondary Phosphine Oxide-Based Nickel Complexes: From Ethylene Hydrophosphinylation to Oligomerization
作者:Rudy Lhermet、Emile Moser、Erwann Jeanneau、Hélène Olivier-Bourbigou、Pierre-Alain R. Breuil
DOI:10.1002/chem.201701414
日期:2017.6.1
A new dimension for secondary phosphine oxide (SPOs) ligands is described in this article. Demonstrated on original π‐allylic nickel structures, these self‐assembled complexes trigger catalytic hydrophosphinylation reactions. Addition of a Lewis acid B(C6F5)3 switches the reactivity towards migratory insertion and thus ethylene oligomerization through an unprecedented outer‐sphere interaction with
本文介绍了仲氧化膦(SPOs)配体的新尺寸。这些自组装的复合物在原始的π-烯丙基镍结构上得到证实,可引发催化的氢膦化反应。路易斯酸B(C 6 F 5)3的添加将反应性移向迁移插入,并因此通过与配位SPO配体的前所未有的外球相互作用而使乙烯低聚。NMR实验和X射线分析可以观察两性离子活性物质的形成及其降解途径。
Efficient and Selective Nickel-Catalyzed Addition of H−P(O) and H−S Bonds to Alkynes
metal catalysts in the catalytic additions of a variety of P(O)-H bonds and an S-H bond to alkynes, affording regio- and stereoselectively both the Markovnikov and the anti-Markovnikov adducts, respectively, in high yields. A related five-coordinate hydrido nickel complex in the catalysis is successfully isolated, which can react readily with an alkyne to give the addition products.
廉价的镍催化剂在催化加成各种 P(O)-H 键和 SH 键到炔烃时比相应的贵金属催化剂更具反应性,提供区域和立体选择性的马尔科夫尼科夫和反马尔科夫尼科夫加合物,分别以高产。催化剂中相关的五配位氢化镍配合物被成功分离,它可以很容易地与炔烃反应生成加成产物。