The mechanism of a ligand-promoted C(sp3)-H activation and arylation reaction via palladium catalysis: Theoretical demonstration of a Pd(II)/Pd(IV) redox manifold

Yanfeng Dang, Shuanglin Qu, John W. Nelson, Hai D. Pham, Zhi Xiang Wang, Xiaotai Wang

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

Density functional theory (DFT) computations (BP86 and M06-L) have been utilized to elucidate the detailed mechanism of a palladium-catalyzed reaction involving pyridine-type nitrogen-donor ligands that significantly expands the scope of C(sp3)-H activation and arylation. The reaction begins with precatalyst initiation, followed by substrate binding to the Pd(II) center through an amidate auxiliary, which directs the ensuing bicarbonate-assisted C(sp3)-H bond activation producing five-membered-ring cyclopalladate(II) intermediates. These Pd(II) complexes further undergo oxidative addition with iodobenzene to form Pd(IV) complexes, which proceed by reductive C-C elimination/coupling to give final products of arylation. The base-assisted C(sp3)-H bond cleavage is found to be the rate-determining step, which involves hydrogen bond interactions. The mechanism unravels the intimate involvement of the added 2-picoline ligand in every phase of the reaction, explains the isolation of the cyclopalladate intermediates, agrees with the observed kinetic hydrogen isotope effect, and demonstrates the Pd(II)/Pd(IV) redox manifold.

Original languageEnglish (US)
Pages (from-to)2006-2014
Number of pages9
JournalJournal of the American Chemical Society
Volume137
Issue number5
DOIs
StatePublished - Feb 11 2015

Fingerprint

Dive into the research topics of 'The mechanism of a ligand-promoted C(sp<sup>3</sup>)-H activation and arylation reaction via palladium catalysis: Theoretical demonstration of a Pd(II)/Pd(IV) redox manifold'. Together they form a unique fingerprint.

Cite this