金催化的环异构化反应已经使用胍官能化的 M 12 L 24纳米球进行了探索,该纳米球强烈封装通过氢键用磺酸基官能化的金络合物。由于M 12 L 24纳米球可以结合多达24 个金配合物,因此可以轻松评估局部催化剂浓度对反应结果的影响。此外,球体的胍基团可以与底物的羧基发生弱相互作用,促进催化活性位点附近的底物的预组织。这两种效应都会影响金催化转化的选择性和速率。具有内部乙炔官能团的含乙酸盐底物可以在 M 12 L 24纳米球内有效环化,其中底物的预组织起着至关重要的作用。对于2-炔基苯甲酸,可以通过调节胍基功能化M 12 L 24纳米球中金催化剂的局部浓度来控制反应的选择性。
Platinum pincercomplexes featuring an SCS indenediide backbone have been prepared and evaluated in the catalyticcycloisomerization of alkynoic acids and N‐tosyl alkynylamides. One of the platinum complexes significantly outperforms its palladium analogue for the formation of 6‐ and 7‐membered rings. The catalytic system takes advantage of the alkynophilicity of Pt and of the non‐innocent character
A case study of proton shuttling in palladium catalysis
作者:Julien Monot、Paul Brunel、Christos E. Kefalidis、Noel Ángel Espinosa-Jalapa、Laurent Maron、Blanca Martin-Vaca、Didier Bourissou
DOI:10.1039/c5sc04232a
日期:——
Thanks to mechanistic studies, the catalytic performance of SCS indenediide Pd pincer complexes has been spectacularly enhanced using catechol additives as proton shuttles.
Gold Functionalized Platinum M<sub>12</sub>L<sub>24</sub>-Nanospheres and Their Application in Cyclization Reactions
作者:Stefan H. A. M. Leenders、Maximillian Dürr、Ivana Ivanović-Burmazović、Joost N. H. Reek
DOI:10.1002/adsc.201600071
日期:2016.4.28
blocks with a palladium or platinum precursor. These spheres can be functionalized on the inside with a gold(I) chloride complex leading to a high local concentration of gold(I) complexes. The high local concentration makes the neutral gold species an active catalyst. Furthermore, the platinum‐gold spheres can be post‐modified with a silver(I) salt to form cationic gold(I) catalysts. The platinum assemblies
Polyamine dendrimer-encapsulated Pd2+ catalysts were prepared by complexation of PdCl2 with internal tertiary amino groups of the dendrimer. The fifth-generation Pd2+ dendrimer catalyst showed cooperative catalysis between Pd2+ species and the internal nanocavity consisting of regularly arranged tertiary amino groups to promote the intramolecular cyclization of gamma-acetylenic acids efficiently.
Kafka, Stanislav; Kytner, Jan; Silhankova, Alexandra, Collection of Czechoslovak Chemical Communications, 1987, vol. 52, # 8, p. 2035 - 2046