Herein, we report a highly efficient and practical method for pyridine‐derived heterobiaryl synthesis through palladium‐catalyzed electrophilic functionalization of easily available pyridine‐derived quaternary phosphonium salts. The nice generality of this reaction was goes beyond arylation, enabling facile incorporation of diverse carbon‐based fragments, including alkenyl, alkynyl, and also allyl
Metal–organic gels as functionalisable supports for catalysis
作者:Jianyong Zhang、Xiaobing Wang、Lisi He、Liuping Chen、Cheng-Yong Su、Stuart L. James
DOI:10.1039/b822104a
日期:——
Modification of Fe-tricarboxylate based metalâorganic gels yielded tert-butyl substituted or phosphine-functionalised gels in alcohols or DMF, which were prepared from 5-tert-butylisophthalic acid and 5-diphenylphosphanylisophthalic acid, respectively. Owing to their permeability, such phosphine-functionalised metalâorganic gels can act as a new type of functionalisable porous scaffold. The phosphorus-containing gel was subsequently functionalised with Pd(II) by immersion in a solution of Pd(COD)Cl2 (COD = 1,5-cyclooctadiene). The subsequently functionalised Pd(II)-immobilised gel and its xerogel/aerogel showed high activity in the catalysis of Suzuki CâC coupling comparable to unsupported complexes. The gel/xerogels could be reused under ambient atmosphere.
Single point activation of pyridines enables reductive hydroxymethylation
作者:Bruno Marinic、Hamish B. Hepburn、Alexandru Grozavu、Mark Dow、Timothy J. Donohoe
DOI:10.1039/d0sc05656a
日期:——
Pyridines can be activated at a single point with a new benzyl group, followed by dearomative functionalisation at C3 using formaldehyde.
吡啶可以在一个新的苄基点被激活,然后使用甲醛进行C3的去芳香官能团化反应。
Discrete Ag6L6 coordination nanotubular structures based on a T-shaped pyridyl diphosphine
作者:Xiaobing Wang、Jing Huang、Shenglin Xiang、Yu Liu、Jianyong Zhang、Andreas Eichhöfer、Dieter Fenske、Shi Bai、Cheng-Yong Su
DOI:10.1039/c0cc05235c
日期:——
Ag6L6-type coordination nanotubular structures have been assembled from 6 Ag(I) ions and 6 T-shaped ligands, 4-(3,5-bis(diphenylphosphino)phenyl)pyridine; the nanotubes represent a discrete molecular architecture of a number of polymeric structures assembled from dimeric building blocks.
Ag6L6 型配位纳米管结构由 6 个 Ag(I) 离子和 6 个 T 型配体(4-(3,5-双(二苯基膦)苯基)吡啶)组装而成;纳米管代表了由二聚体结构单元组装而成的一些聚合物结构的离散分子结构。
Dynamic functionalised metallogel: An approach to immobilised catalysis with improved activity
作者:Jing Huang、Lisi He、Jianyong Zhang、Liuping Chen、Cheng-Yong Su
DOI:10.1016/j.molcata.2009.11.001
日期:2010.2
A metal-organic gel (MOG) route to immobilised catalysts has been developed based on the reversibility of coordination bond formation in a Fe3+-carboxylate MOG. The ferric gel was rationally designed based on a bifunctional ligand, 5-1H-benzo[d]imidazole-1,3-dicarboxylic acid (L1), in which the imidazole N atom may further hind to a soft ion like Pd2+ more strongly Clue to the HSAB matching. Palladium(II) was successfully loaded in the gel to yield a supported coordination catalyst. Compared with its homogeneous counterparts, the immobilised gel catalyst exhibited significantly improved catalytic activity Under mild conditions as shown in Suzuki-Miyaura C-C coupling, and Could be reused for several times. (C) 2009 Elsevier B.V. All rights reserved.