RETRACTED ARTICLE: The amine-catalysed Suzuki–Miyaura-type coupling of aryl halides and arylboronic acids

Retraction: Transition-metal-free synthesis of conjugated microporous polymers via amine-catalyzed Suzuki–Miyaura coupling reaction

“…This article reports the synthesis of conjugated microporous polymers using an amine-catalyzed Suzuki–Miyaura coupling reaction. This article builds upon findings first reported by Xu et al 1 and invokes the same mechanism for Pd-free polymer synthesis. Since the publication of our article in Chemical Science , we have been made aware of concerns regarding the conclusions of the above-mentioned Nature Catalysis article, disputing the mechanisms and claims that the reactions reported are not Pd-free.…”

Transition-Metal-Free Synthesis of Conjugated Microporous Polymers via Amine-Catalyzed Suzuki-Miyaura Coupling Reaction

“…What's more, it was impossible for the reaction between aryl halides and K 2 CO 3 /Cat, due to the relatively weaker binding affinity. Different from the reaction conditions for the small molecules synthesis, 36 we found that the polymerization proceeded smoothly in polar solvents, such as N, N-dimethylformamide (DMF), and N, N-dimethylacetamide (DMAc) (Table S1 and Fig. S4 in the Supporting Information).…”

“…10,34,35 Recently, it is reported that the Suzuki-Miyaura-type coupling of aryl halides with arylboronic acids can be accessed by organicatalysis using amine catalysts. 36 CMPs can avoid of the interference by Pd and thereby is worth to be explored. Herein, we report the construction of the CMPs by an organic amine-catalysed Suzuki-Miyaura coupling reaction in high efficiency for the first time.…”

“…We employed an amine-catalyst to promote the polymerization by Suzuki-Miyaura coupling reaction. 36 The amine-catalysed reaction was efficient for C-C formation in the small molecules synthesis. However, the using for a cross-linked polymer synthesis has been unprecedented and whether it is effective enough to go through polymerization is unknown.…”

Tetrameric Aryl Palladium Bromide Intermediates Leading to Facile Transmetalation in Suzuki–Miyaura Cross-Couplings with Pd@MIL-101-NH2(Cr)

“…15 Ligandless systems, i.e., those lacking strong donor ligands, have proved to be highly active catalysts when used at very low catalyst loadings (e.g., parts per million or billion), resulting in turnover numbers (TON) of up to 10 7 . [16][17][18][19][20][21][22][23][24][25] Often, these palladium species are stabilized by a support (e.g., carbon, polymers, dendrimers, metal-organic frameworks (MOFs), [26][27][28] quaternary ammonium salts (e.g., NBu4X, Jeffery system), 29,30 or other additives (i.e., N,N-dimethylglycine). 31 Identifying the composition and morphology of the catalytically active species in ligandless systems, which are generated from Pd salts or from Pd NPs, is a very challenging task.…”