Catalytic Dehydrogenation of Alkanes by PCP–Pincer Iridium Complexes Using Proton and Electron Acceptors

Shada, Arun Dixith Reddy; Miller, Alexander M.; Emge, Thomas J.; Goldman, Alan S.

doi:10.1021/acscatal.0c05160

Catalytic Dehydrogenation of Alkanes by PCP–Pincer Iridium Complexes Using Proton and Electron Acceptors

Journal Article · Mon Feb 22 00:00:00 EST 2021 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.0c05160· OSTI ID:1776516

Shada, Arun Dixith Reddy ^[1]; ^[2]; Emge, Thomas J. ^[3]; ^[3]

Rutgers Univ., New Brunswick, NJ (United States); Rutgers University
Univ. of North Carolina, Chapel Hill, NC (United States)
Rutgers Univ., New Brunswick, NJ (United States)

Dehydrogenation to give olefins offers the most broadly applicable route to the chemical transformation of alkanes. Furthermore, transition-metal-based catalysts can selectively dehydrogenate alkanes using either olefinic sacrificial acceptors or a purge mechanism to remove H₂; both of these approaches have significant practical limitations. Here, we report the use of pincer-ligated iridium complexes to achieve alkane dehydrogenation by proton-coupled electron transfer, using pairs of oxidants and bases as proton and electron acceptors. Up to 97% yield was achieved with respect to oxidant and base, and up to 15 catalytic turnovers with respect to iridium, using t-butoxide as base coupled with various oxidants, including oxidants with very low reduction potentials. Mechanistic studies indicate that (pincer)IrH₂ complexes react with oxidants and base to give the corresponding cationic (pincer)IrH⁺ complex, which is subsequently deprotonated by a second equivalent of base; this affords (pincer)Ir which is known to dehydrogenate alkanes and thereby regenerates (pincer)IrH₂.

View Accepted Manuscript (DOE)

Research Organization:: Rutgers Univ., New Brunswick, NJ (United States); Rutgers University, New Brunswick, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0020139

OSTI ID:: 1776516

Alternate ID(s):: OSTI ID: 2001245

Journal Information:: ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 5 Vol. 11; ISSN 2155-5435

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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