Ligand Effects in Pd-Catalyzed Intermolecular Alkyne Hydroarylations
KAUST DepartmentKAUST Catalysis Center (KCC)
Chemical Science Program
Physical Sciences and Engineering (PSE) Division
Embargo End Date2020-09-11
Permanent link to this recordhttp://hdl.handle.net/10754/656788
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AbstractThe use of palladium(II) catalysts for the synthesis of aryl alkenes by addition of aromatic C–H bonds to alkynes has received a great interest in the literature. The mechanistic features of the reaction have been largely discussed, but no systematic study has been reported so far, particularly for what concerns the role of ligands. In this work, we performed a detailed theoretical study in order to fill this gap. To this extent, three different systems have been considered, with the aim to emphasize how the steric and electronic metal environment affects the catalytic activity and, most notably, steers the reaction selectivity toward the two main products of single and double alkyne insertion into the aromatic C–H bond. Moreover, given the crucial role of the acid media, two acids have been considered, namely, trifluoroacetic acid and tetrafluoroboric acid, to understand the effect of the acid strength and coordinative power on the competition between the different pathways.
SponsorsThe authors thank ENEA (http://www.enea.it) and the HPC team for support as for using the ENEA-GRID and the HPC facilities CRESCO (http://www.cresco.enea.it) Portici (Naples, Italy).
PublisherAmerican Chemical Society (ACS)