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Title: Rh(CAAC)-Catalyzed Arene Hydrogenation: Evidence for Nanocatalysis and Sterically Controlled Site-Selective Hydrogenation

Abstract

We report the hydrogenation of aromatic groups at room temperature and low hydrogen pressure by [(CAAC)Rh(COD)Cl] (CAAC = cyclic alkyl amino carbene), which was generated from the reaction of free CAAC and [Rh(COD)Cl]2. Facile access to the molecular catalyst precursor, mild reaction conditions, and operational simplicity are notable advantages that allow for kinetic, mechanistic, and spectroscopic studies to elucidate the nature of the catalyst. The cumulative results of these studies, which support the formation of a heterogeneous catalyst from a molecular CAAC-Rh precursor for arene hydrogenation, contrast with that of a previously reported homogeneous CAAC-rhodium catalyst for arene hydrogenation. We determined the site selectivity of this arene hydrogenation system through detailed competition experiments in small molecules bearing aromatic rings of varying electronic and steric influence. With the growing popularity of CAAC ligands in synthetic inorganic chemistry and homogeneous catalysis, this work illustrates the remarkable potential of CAAC ligands in the modification and stabilization of heterogeneous catalysts, in light of the burgeoning interest in organometallic approaches using structurally well-defined precursors for the controlled generation of nanocatalysts.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1492981
Alternate Identifier(s):
OSTI ID: 1822163
Report Number(s):
PNNL-SA-130529
Journal ID: ISSN 2155-5435
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
ACS Catalysis
Additional Journal Information:
Journal Volume: 8; Journal Issue: 9; Journal ID: ISSN 2155-5435
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; hydrogenation; site selectivity; arene; nanoparticle

Citation Formats

Tran, Ba L., Fulton, John L., Linehan, John C., Lercher, Johannes A., and Bullock, Ronald Morris. Rh(CAAC)-Catalyzed Arene Hydrogenation: Evidence for Nanocatalysis and Sterically Controlled Site-Selective Hydrogenation. United States: N. p., 2018. Web. doi:10.1021/acscatal.8b02589.
Tran, Ba L., Fulton, John L., Linehan, John C., Lercher, Johannes A., & Bullock, Ronald Morris. Rh(CAAC)-Catalyzed Arene Hydrogenation: Evidence for Nanocatalysis and Sterically Controlled Site-Selective Hydrogenation. United States. https://doi.org/10.1021/acscatal.8b02589
Tran, Ba L., Fulton, John L., Linehan, John C., Lercher, Johannes A., and Bullock, Ronald Morris. Mon . "Rh(CAAC)-Catalyzed Arene Hydrogenation: Evidence for Nanocatalysis and Sterically Controlled Site-Selective Hydrogenation". United States. https://doi.org/10.1021/acscatal.8b02589. https://www.osti.gov/servlets/purl/1492981.
@article{osti_1492981,
title = {Rh(CAAC)-Catalyzed Arene Hydrogenation: Evidence for Nanocatalysis and Sterically Controlled Site-Selective Hydrogenation},
author = {Tran, Ba L. and Fulton, John L. and Linehan, John C. and Lercher, Johannes A. and Bullock, Ronald Morris},
abstractNote = {We report the hydrogenation of aromatic groups at room temperature and low hydrogen pressure by [(CAAC)Rh(COD)Cl] (CAAC = cyclic alkyl amino carbene), which was generated from the reaction of free CAAC and [Rh(COD)Cl]2. Facile access to the molecular catalyst precursor, mild reaction conditions, and operational simplicity are notable advantages that allow for kinetic, mechanistic, and spectroscopic studies to elucidate the nature of the catalyst. The cumulative results of these studies, which support the formation of a heterogeneous catalyst from a molecular CAAC-Rh precursor for arene hydrogenation, contrast with that of a previously reported homogeneous CAAC-rhodium catalyst for arene hydrogenation. We determined the site selectivity of this arene hydrogenation system through detailed competition experiments in small molecules bearing aromatic rings of varying electronic and steric influence. With the growing popularity of CAAC ligands in synthetic inorganic chemistry and homogeneous catalysis, this work illustrates the remarkable potential of CAAC ligands in the modification and stabilization of heterogeneous catalysts, in light of the burgeoning interest in organometallic approaches using structurally well-defined precursors for the controlled generation of nanocatalysts.},
doi = {10.1021/acscatal.8b02589},
journal = {ACS Catalysis},
number = 9,
volume = 8,
place = {United States},
year = {Mon Jul 30 00:00:00 EDT 2018},
month = {Mon Jul 30 00:00:00 EDT 2018}
}

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Figures / Tables:

Scheme 1 Scheme 1: Catalytic arene hydrogenations by Rh(CAAC) systems.

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Works referencing / citing this record:

Selective Arene Hydrogenation for Direct Access to Saturated Carbo- and Heterocycles
journal, April 2019

  • Wiesenfeldt, Mario P.; Nairoukh, Zackaria; Dalton, Toryn
  • Angewandte Chemie International Edition, Vol. 58, Issue 31
  • DOI: 10.1002/anie.201814471

Hydrierung borylierter Aromaten
journal, December 2018

  • Wollenburg, Marco; Moock, Daniel; Glorius, Frank
  • Angewandte Chemie, Vol. 131, Issue 20
  • DOI: 10.1002/ange.201810714

Die selektive Arenhydrierung bietet einen direkten Zugang zu gesättigten Carbo‐ und Heterocyclen
journal, April 2019

  • Wiesenfeldt, Mario P.; Nairoukh, Zackaria; Dalton, Toryn
  • Angewandte Chemie, Vol. 131, Issue 31
  • DOI: 10.1002/ange.201814471

Ionic Liquid Stabilized Niobium Oxoclusters Catalyzing Oxidation of Sulfides with Exceptional Activity
journal, February 2019

  • Zhou, Qingqing; Ye, Man; Ma, Wenbao
  • Chemistry – A European Journal, Vol. 25, Issue 16
  • DOI: 10.1002/chem.201806178

Recent Advances in the Chemistry of N ‐Heterocyclic‐Carbene‐Functionalized Metal‐Nanoparticles and Their Applications
journal, December 2018

  • An, Yuan‐Yuan; Yu, Jian‐Gang; Han, Ying‐Feng
  • Chinese Journal of Chemistry, Vol. 37, Issue 1
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Hydrogenation of Borylated Arenes
journal, May 2019

  • Wollenburg, Marco; Moock, Daniel; Glorius, Frank
  • Angewandte Chemie International Edition, Vol. 58, Issue 20
  • DOI: 10.1002/anie.201810714

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.