Palladium-Catalyzed Additions of Terminal Alkynes to Acceptor Alkynes
作者:Barry M. Trost、Mark T. Sorum、Chuen Chan、Gerd Rühter
DOI:10.1021/ja9624937
日期:1997.1.1
The development of addition reactions wherein the product is the simple sum of the reactants plus anything else (only needed catalytically) constitutes an important goal for enhanced synthetic efficiency. The C−H bond of terminalalkynes (the donor alkynes) can be added to either terminalalkynes (self-coupling) or activated internal alkynes (cross-coupling) (the acceptor alkynes) in the presence of
E-Selective dimerization of phenylacetylene catalyzed by cationic tris(μ-hydroxo)diruthenium(II) complex and the mechanistic insight: The role of two ruthenium centers in catalysis
4-acetyl-, and 4-methylphenylacetylene give the corresponding enynes. The kinetic study for dimerization of phenylacetylene shows the second-order and first-order reactions with regard to the phenylacetylene and 1 concentrations, respectively, suggesting this reaction to be catalyzed by a dinuclear rutheniumcomplex. Addition of PMe3 to the catalytic system strongly discourages the dimerization. These features
Dimerisation d'octyne-1, methyl-2 butyne-3ol-2 et butyne-3 dicarboxylate-1,1 de dimethyle et codimerisation entre le butyne-2oate de methyle ou la (phenyl propynyl) sulfone et des composes acetyleniques en presence d'acetate de Pd(II)-triphenylphosphine
Dimerisation d'octyne-1,methyl-2 butyne-3ol-2 et butyne-3 dicarboxylate-1,1 dedimethyle et codimerisation entre le butyne-2oate demethyle ou la (phenyl propynyl) sulfone et des composes acetyleniques en d'醋酸脱钯(II)-三苯基膦
Evaluation of the Catalytic Capability of <i>cis</i>
- and <i>trans</i>
-Diquinoxaline Spanned Cavitands
Synthesis of new cis‐typed bis‐phosphorus cavitands is described, including a description of their catalytic capability in transition‐metal‐catalyzed reactions. The catalysis of cis‐versions were compared to the corresponding trans‐isomeric bis‐phosphorus cavitands, which revealed that different shape of compartments gave different profile of reactivity and product distribution.
Probing the steric limits of rhodium catalyzed hydrophosphinylation. P–H addition vs. dimerization/oligomerization/polymerization
作者:Marcia E. Richard、Kyle P. Reese、Joshua J. Stone、Phillip D. Pickett、Eric S. Tillman、Robert A. Stockland
DOI:10.1016/j.jorganchem.2010.08.024
日期:2011.1
reactivity of secondary phosphine oxides containing bulky organic fragments in hydrophosphinylation reactions has been investigated using several rhodium based catalysts. Upon heating in a focused microwave reactor, HP(O)(2-C6H4Me)2 adds to prototypical terminal alkynes affording a complex mixture containing 1,2 and 1,1-addition products. Addition of a second ortho-substituent (HP(O)Mes2) completely suppresses
已经使用几种铑基催化剂研究了含有大量有机片段的仲膦氧化物在氢膦化反应中的反应性。在聚焦的微波反应器中加热后,HP(O)(2-C 6 H 4 Me)2添加到典型的末端炔烃中,从而提供包含1,2和1,1-加成产物的复杂混合物。添加第二个邻位取代基(HP(O)Mes 2)完全抑制了烷基和芳基取代炔烃的氢膦酰化反应。在HP(O)Mes 2的情况下,温度,催化剂负载,溶剂和微波功率的变化均无法引发加成反应。。尽管该仲氧化膦不参与氢膦化反应,但它促进了苯乙炔的聚合。HP(O)R 2底物由于容易发生的氢膦化作用,在涉及炔烃的反应中通常不被认为是铑配合物的无害配体。虽然对于二苯基膦氧化物确实是正确的,但本文介绍的化学结果表明,由于它们对加成反应缺乏反应性,HP(O)Mes 2和相关的庞大的仲膦氧化物作为涉及炔烃的铑催化转化的有价值的配体具有巨大潜力。