3 years ago

C–H Arylation of Phenanthrene with Trimethylphenylsilane by Pd/o-Chloranil Catalysis: Computational Studies on the Mechanism, Regioselectivity, and Role of o-Chloranil

C–H
Arylation of Phenanthrene with Trimethylphenylsilane
by Pd/o-Chloranil Catalysis: Computational
Studies on the Mechanism, Regioselectivity, and Role of o-Chloranil
Hideto Ito, Mari Shibata, Kenichiro Itami
The transition-metal-catalyzed C–H arylation of aromatic hydrocarbons represents a useful and ideal method for the production of biaryls and multiarylated aromatic compounds. We have previously reported the palladium-catalyzed direct C–H arylation of polycyclic aromatic hydrocarbons, such as phenanthrene, pyrene, and corannulene with various organosilicon, -borane, and -germanium compounds. In these reactions, o-chloranil proved to be an essential and unique promoter (stoichiometrically as an oxidant) and arylation occurred exclusively at the K-region. Herein, we report our mechanistic investigation of Pd/o-chloranil catalysis in C–H arylation of phenanthrene with trimethylphenylsilane by computational calculations. The results revealed that C–H arylation occurs through a sequence of transmetalation, carbometalation, and trans-β-hydrogen elimination steps. In addition, the triple role of o-chloranil as a ligand, oxidant, and base is also elucidated.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b11260

DOI: 10.1021/jacs.7b11260

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