92-86-4Relevant articles and documents
Functionalized NHC-incorporated Te?Fe?Cu clusters: Facile synthesis, electrochemistry, and catalytic reaction
Shieh, Minghuey,Liu, Yu-Hsin,Li, Yu-Huei,Lin, Chien-Nan,Wang, Chih-Chin
, p. 161 - 169 (2018)
Two novel TeFe3(CO)9-containing functionalized NHC dicopper complexes, [TeFe3(CO)9{Cu(Me2-bimy)}2] (1) and [TeFe3(CO)9{Cu(iPr2-bimy)}2] (2), were prepared from the reaction of the ternary Te?Fe?Cu complex [TeFe3(CO)9{Cu(MeCN)}2] with bis-N-methyl- or bis-N-isopropyl-substituted benzimidazol-2-ylidene (Me2-bimy or iPr2-bimy) under appropriate conditions, respectively. X-ray analysis showed that Me2-bimy-introduced complex 1 displayed a TeFe3(CO)9Cu(Me2-bimy) trigonal-bipyramidal core geometry having the Fe2Cu face capped by a Cu(Me2-bimy) fragment with the two bonded Cu atoms, whereas the bulkier iPr2-bimy-incorporated complex 2 exhibited a similar TeFe3(CO)9Cu(iPr2-bimy) core having the Fe3 triangle coordinated by a Cu(iPr2-bimy) fragment with the two unbonded Cu atoms. On the other hand, when [TeFe3(CO)9{Cu(MeCN)}2] reacted with the 4,5-dichloro-substituted 1,3-dimethylimidazolium salt (Me2-Cl2-imy·HI) in the presence of KOtBu, a different type of [TeFe3(CO)9{Cu(Me2-Cl2-imy)}2] (3) was produced in good yields. Cluster 3 was shown to possess a tetrahedral TeFe3 core geometry in which the two Fe?Fe edges were each bridged by a Cu(Me2-Cl2-imy) group. According to solid-state packings, complex 1 revealed a cluster-based 3D-supramolecular framework and complexes 2 and 3 each formed a 1D-supramolecular chain, which was stabilized by intermolecular C?H…O interactions between COs and CH moieties of the corresponding NHC ligands. Further, these di-Cu(I) based complexes 1?3 exhibited catalytic activities toward the homocoupling of arylboronic acid with high yields. Importantly, the catalytic efficiencies of this series of functionalized NHC-incorporated TeFe3(CO)9Cu2-based complexes perfectly paralleled the ease of their first oxidation and the greater electron density of the carbene atom in the NHC ligands, which was elucidated by electrochemistry, 13C NMR, and DFT calculations.
Silk?Fibroin-Supported Palladium Catalyst for Suzuki-Miyaura and Ullmann Coupling Reactions of Aryl Chlorides
Albano, Gianluigi,Farinola, Gianluca M.,Giannini, Cinzia,Musio, Roberta,Omenetto, Fiorenzo G.,Rizzo, Giorgio,Sibillano, Teresa
supporting information, (2022/02/03)
Recently, we have reported the preparation of a silk fibroin-supported Palladium catalyst (Pd/SF) and its use in the Suzuki-Miyaura cross-coupling of aryl iodides. Since its synthetic applicability and structural features are still far from being fully ex
Pd-catalyzed oxidative homocoupling of arylboronic acids in WEPA: A sustainable access to symmetrical biaryls under added base and ligand-free ambient conditions
Appa, Rama Moorthy,Lakshmidevi, Jangam,Naidu, Bandameeda Ramesh,Venkateswarlu, Katta
, (2021/01/11)
Symmetrical and unsymmetrical biaryls comprises a diverse class of biologically eloquent organic compounds. We herein report, a quick and eco-friendly protocol for the synthesis of biaryls by an oxidative (aerobic) homocoupling of arylboronic acids (ABAs) using Pd(OAc)2 in water extract of pomogranate ash (WEPA) as an efficient agro-waste(bio)-derived aqueous (basic) media. The reactions were executed at ambient aerobic conditions in the absence of external base and ligand to result symmetrical biaryls in excellent yields. The use of renewable media with an effective exploitation of waste, short reaction times, excellent yields of products, easy separation of the products, unnecessating the external base, oxidant, ligand or volatile organic solvents and ambient reaction conditions are the vital insights of the present protocol.
