Building on our recent disclosure of catalysis at dinuclear Pd(I) sites, we herein report the application of this concept to the realization of the first catalytic method to convert aryl iodides into the corresponding ArSeCF3 compounds. Highly efficient C-SeCF3 coupling of a range of aryl iodides was achieved, enabled by an air-, moisture-, and thermally stable dinuclear Pd(I) catalyst. The novel SeCF3 -bridged dinuclear Pd(I) complex 3 was isolated, studied for its catalytic competence and shown to be recoverable. Experimental and computational data are presented in support of dinuclear Pd(I) catalysis.
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http://dx.doi.org/10.1002/anie.201503388 | DOI Listing |
Angew Chem Int Ed Engl
February 2023
Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.
While vinyl cyclopropanes are valuable functional groups in drugs or natural products as well as established precursors to trigger a rich variety of synthetic transformations, their reactive nature can make their installation via direct catalytic approaches challenging. We herein present a modular access to (di)vinyl cyclopropanes under very mild conditions and full conservation of stereochemistry, allowing access to the cis or trans cyclopropane- as well as E or Z vinyl-stereochemical relationships. Our protocol relies on air-stable dinuclear Pd catalysis, which enables rapid (<30 min) and selective access to a diverse range of vinyl cyclopropane motifs at room temperature, even on gram scale.
View Article and Find Full Text PDFDalton Trans
September 2022
Institute of Inorganic and Applied Chemistry, Department Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
The reaction of a tethered pyridine diimine (PDI) ligand with copper(I) chloride yielded a μ-chlorido bridged cationic dicopper(I) PDI complex, which is a rare structural motif. The geometric constraint of the ligand is fostering attractive van der Waals interactions between the coplanar pyridine units. This is supported by an Atoms in Molecules (AIM) and NCI (non-covalent interaction) analysis.
View Article and Find Full Text PDFScience
November 2021
Institute of Organic Chemistry, RWTH Aachen University; Landoltweg 1, 52074 Aachen, Germany.
Although machine learning bears enormous potential to accelerate developments in homogeneous catalysis, the frequent need for extensive experimental data can be a bottleneck for implementation. Here, we report an unsupervised machine learning workflow that uses only five experimental data points. It makes use of generalized parameter databases that are complemented with problem-specific in silico data acquisition and clustering.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2022
Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.
While remote functionalization via chain walking has the potential to enable access to molecules via novel disconnections, such processes require relatively long reaction times and can be in need of elevated temperatures. This work features a remote arylation in less than 10 min reaction time at room temperature over a distance of up to 11 carbons. The unprecedented speed is enabled by the air-stable Pd dimer [Pd(μ-I)(PCy Bu)] , which in contrast to its P Bu counterpart does not trigger direct coupling at the initiation site, but regioconvergent and chemoselective remote functionalization to yield valuable fluorinated 1,1-diaryl alkanes.
View Article and Find Full Text PDFOrganometallics
September 2021
Department of Chemistry, University of York, Heslington, York, North Yorkshire YO10 5DD, United Kingdom.
[Pd (μ-PPh)(μ-OAc)(PPh)] is the reduction product of Pd(OAc)(PPh), generated by reaction of 'Pd(OAc)' with two equivalents of PPh. Here, we report that the reaction of [Pd (μ-PPh)(μ-OAc)(PPh)] with PPh results in a nuanced disproportionation reaction, forming [Pd(PPh)] and a phosphinito-bridged Pd-dinuclear complex, namely [Pd (μ-PPh){κ-P,O-μ-P(O)Ph}(κ-PPh)]. The latter complex is proposed to form by abstraction of an oxygen atom from an acetate ligand at Pd.
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