S,O-Functionalized Metal–Organic Frameworks as Heterogeneous Single-Site Catalysts for the Oxidative Alkenylation of Arenes via C–H activation
作者:Niels Van Velthoven、Mickaël Henrion、Jesse Dallenes、Andraž Krajnc、Aram L. Bugaev、Pei Liu、Sara Bals、Alexander V. Soldatov、Gregor Mali、Dirk E. De Vos
DOI:10.1021/acscatal.0c00801
日期:2020.5.1
organometallic complexes with the efficient recovery of solid catalysts. Based on recent progress on homogeneous thioether ligands for Pd-catalyzed C–H activation reactions, we here develop a scalable metal–organic framework-based heterogeneous single-site catalyst containing S,O-moieties that increase the catalyticactivity of Pd(II) for the oxidative alkenylation of arenes. The structure of the Pd@MOF-808-L1
异质单中心催化剂可以将有机金属配合物的精确活性中心设计与固体催化剂的有效回收结合起来。基于用于Pd催化的C–H活化反应的均相硫醚配体的最新进展,我们在此开发可扩展的基于金属-有机骨架的含S,O部分的异质单中心催化剂,可提高Pd(II)的催化活性。用于芳烃的氧化烯基化。所述的结构的Pd @ MOF-808-L1催化剂通过固态核磁共振谱法进行详细表征,N 2物理吸附和高角度环形暗场扫描透射电子显微镜,以及分离的钯活性位点的结构可以通过X射线吸收光谱法进行鉴定。反应时间1小时后,转换频率(TOF)为8.4 h –1,是标准Pd(OAc)2的TOF的3倍,在活性最高的非均相催化剂中排名Pd @ MOF-808-L1曾经报道过芳烃的非定向氧化烯基化。最后,我们证明了单中心催化剂可促进多种富电子芳烃的氧化烯基化,并且该无均相体系的适用性通过工业相关产品的克级合成得到证明。
Investigation of the Catalytic Activity of a 2-Phenylidenepyridine Palladium(II) Complex Bearing 4,5-Dicyano-1,3-bis(mesityl)imidazol-2-ylidene in the Mizoroki-Heck Reaction
作者:Heiko Baier、Alexandra Kelling、Uwe Schilde、Hans-Jürgen Holdt
DOI:10.1002/zaac.201500625
日期:2016.1
step syntheses, starting with the reaction of palladium(II) chloride with 2-phenylpyridine followed by subsequent addition of the NHC ligand to the precatalyst precursor [PdCl(ppy)]2. Suitable crystals for the X-ray analysis of the complexes 4 and 6 were obtained. It was shown that 6 has a shorter NHC-palladium bond than the IMes complex 4. The difference of the palladium carbene bond lengths based on
Efficient Palladium(II) Precatalysts Bearing 4,5‐Dicyanoimidazol‐2‐ylidene for the Mizoroki–Heck Reaction
作者:Heiko Baier、Philipp Metzner、Thomas Körzdörfer、Alexandra Kelling、Hans‐Jürgen Holdt
DOI:10.1002/ejic.201402040
日期:2014.6
[PdCl2(PhCN)(2)]. The three palladium(II) complexes were characterized by NMR and IR spectroscopy, mass spectrometry and elemental analysis. In addition, the molecular structures of 2 and 3 were determined by X-ray diffraction. The pi-acidity of (CN)(2)IBzPic was compared with (CN)(2)IMes and perviously reported pi-acidic imidazol-2-ylidenes by NBO analysis. The Mizoroki-Heck (MH) reactions of various