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NHC Pd(II) and Ag(I) Complexes: Synthesis, Structure, and Catalytic Activity in Three Types of C-C Coupling Reactions.

ABSTRACT: Four bis-benzimidazolium salts, 1,4-bis[1'-(N-R-benzimidazoliumyl)methyl]-2,3,5,6-tetramethylbenzene 2X- (L 1 H 2 ·(PF 6 ) 2 : R = ethyl, X = PF6; L 2 H 2 ·Br 2 : R = picolyl, X = Br; L 3 H 2 ·Br 2 : R = benzyl, X = Br; and L 4 H 2 ·Br 2 : R = allyl, X = Br), and their three N-heterocyclic carbene (NHC) Pd(II) and Ag(I) complexes, L 1 Pd 2 Cl 4 (1), L 2 Ag 2 Br 2 (2), and L 4 (AgBr) 2 (3), as well as one anionic complex L 3 H 2 ·(Ag 4 Br 8 ) 0.5 (4), have been synthesized and characterized. Complex 1 adopts a funnel-like type of structure, complex 2 adopts a cyclic structure, and complex 3 is an open structure. In the crystal packing of 1-4, one-dimensional polymeric chains and two-dimensional supramolecular layers are formed via intermolecular weak interactions, including hydrogen bonds, ?-? interactions, and C-H···? contacts. The catalytic activities of NHC Pd(II) complex 1 in three types of C-C coupling reactions (Suzuki-Miyaura, Heck-Mizoroki, and Sonogashira reactions) were studied. The results show that this catalytic system is efficient for these C-C coupling reactions.

SUBMITTER: Liu QX 

PROVIDER: S-EPMC6641614 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature

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NHC Pd(II) and Ag(I) Complexes: Synthesis, Structure, and Catalytic Activity in Three Types of C-C Coupling Reactions.

Liu Qing-Xiang QX   Hu Ze-Liang ZL   Yu Shao-Cong SC   Zhao Zhi-Xiang ZX   Wei Deng-Che DC   Li Hui-Long HL  

ACS omega 20180410 4

Four bis-benzimidazolium salts, 1,4-bis[1'-(<i>N</i>-R-benzimidazoliumyl)methyl]-2,3,5,6-tetramethylbenzene 2X<sup>-</sup> (<b>L</b> <sup><b>1</b></sup> <b>H</b> <sub><b>2</b></sub> <b>·(PF</b> <sub><b>6</b></sub> <b>)</b> <sub><b>2</b></sub> : R = ethyl, X = PF<sub>6</sub>; <b>L</b> <sup><b>2</b></sup> <b>H</b> <sub><b>2</b></sub> <b>·Br</b> <sub><b>2</b></sub> : R = picolyl, X = Br; <b>L</b> <sup><b>3</b></sup> <b>H</b> <sub><b>2</b></sub> <b>·Br</b> <sub><b>2</b></sub> : R = benzyl, X = Br; a  ...[more]

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