skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Visible-Light-Enhanced Cobalt-Catalyzed Hydrogenation: Switchable Catalysis Enabled by Divergence between Thermal and Photochemical Pathways

Journal Article · · ACS Catalysis

The catalytic hydrogenation activity of the readily-prepared, coordinatively saturated cobalt(I) precatalyst, (R,R)-(iPrDuPhos)Co(CO)2H ((R,R)-iPrDuPhos = (+)-1,2-bis[(2R,5R)-2,5-diisopropylphospholano]benzene) is described. While efficient turnover was observed with a range of alkenes upon heating to 100 ºC, the catalytic performance of the cobalt catalyst was markedly enhanced upon irradiation with blue light at 35 °C. Here, this improved reactivity enabled hydrogenation of terminal, di- and trisubstituted alkenes, alkynes, and carbonyl compounds. A combination of deuterium labeling studies, hydrogenation of alkenes containing radical clocks and experiments probing relative rates support a hydrogen atom transfer pathway under thermal conditions that is enabled by a relatively weak cobalt–hydrogen bond of 56 kcal/mol. In contrast, data for the photocatalytic reactions support light-induced dissociation of a carbonyl ligand followed by a coordination-insertion sequence where the product is released by combination of a cobalt alkyl intermediate with the starting hy-dride, (R,R)-(iPrDuPhos)Co(CO)2H. These results demonstrate the versatility with catalysis with Earth-abundant metals as pathways involving open- versus closed-shell intermediates can be switched by the energy source.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0006498
OSTI ID:
1760172
Journal Information:
ACS Catalysis, Vol. 11; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (56)

Visible Light Photoredox Catalysis with Transition Metal Complexes: Applications in Organic Synthesis journal March 2013
Asymmetric catalysis activated by visible light journal January 2015
Light - driven deracemization enabled by excited - state electron transfer journal October 2019
Photoredox Catalysis in Organic Chemistry journal June 2016
Visible-Light Photoredox Catalysis journal June 2012
Visible-light promoted bimetallic catalysis journal June 2010
Sequential Visible-Light Photoactivation and Palladium Catalysis Enabling Enantioselective [4+2] Cycloadditions journal October 2017
Controllable Isomerization of Alkenes by Dual Visible‐Light‐Cobalt Catalysis journal March 2019
Combining visible light catalysis and transfer hydrogenation for in situ efficient and selective semihydrogenation of alkynes under ambient conditions journal January 2016
Visible-Light-Controlled Ruthenium-Catalyzed Olefin Metathesis journal April 2019
Generation of Powerful Tungsten Reductants by Visible Light Excitation journal July 2013
Direct Visible-Light-Excited Asymmetric Lewis Acid Catalysis of Intermolecular [2+2] Photocycloadditions journal June 2017
A dual light-driven palladium catalyst: Breaking the barriers in carbonylation reactions journal April 2020
Visible‐Light Controlled Divergent Catalysis Using a Bench‐Stable Cobalt(I) Hydride Complex journal March 2020
A Photoswitchable Olefin Metathesis Catalyst journal January 2017
Plasmonic Switching of the Reaction Pathway: Visible‐Light Irradiation Varies the Reactant Concentration at the Solid–Solution Interface of a Gold–Cobalt Catalyst journal August 2019
Three-Component Azidation of Styrene-Type Double Bonds: Light-Switchable Behavior of a Copper Photoredox Catalyst journal June 2015
Synthesis and Reactivity of Organometallic Intermediates Relevant to Cobalt‐Catalyzed Hydroformylation journal March 2020
Transition-Metal Hydride Radical Cations journal February 2016
The Reaction of Cobaloximes with Hydrogen: Products and Thermodynamics journal December 2014
Initiating radical cyclizations by H transfer from transition metals journal December 2008
Catalytic Proton Coupled Electron Transfer from Metal Hydrides to Titanocene Amides, Hydrazides and Imides: Determination of Thermodynamic Parameters Relevant to Nitrogen Fixation journal September 2016
Pentacarbonyliron(0) photocatalyzed hydrogenation and isomerization of olefins journal January 1976
Photogeneration of very active homogeneous catalysts using laser light excitation of iron carbonyl precursors journal February 1981
Density Functional Theory Study of Fe(CO) 32 -C 3 H 6 ), HFe(CO) 33 -C 3 H 5 ), and the Iron−Allyl Bond Energy journal May 2003
Density Functional Study of Fe(CO) 3 and Fe(CO) 3 (L) with H 2 and C 2 H 4 , where L = H 2 or C 2 H 4 :  Reactions Relevant to Olefin Hydrogenation journal August 2005
Mechanism for Iron-Catalyzed Alkene Isomerization in Solution journal August 2008
Gas-phase organometallic catalysis: kinetics and mechanism of the hydrogenation of ethylene by Fe(CO)3(C2H4)2 journal December 1987
Gas-phase organometallic kinetics. 2. Dissociative substitution kinetics of Fe(CO)2(C2H4)3 by transient IR absorption spectrometry journal February 1987
Photochemical and thermal decomposition of hydridotetracarbonylcobalt(I). Evidence for a radical pathway involving octacarbonyldicobalt journal March 1980
Thermal and photochemical reactions of dinuclear metal carbonyl compounds with metal hydrides journal January 1982
Generation of catalysts by photolysis of transition metal complexes journal January 1975
Photochemistry of metal carbonyls journal August 1974
Group VI metal carbonyl photoassisted isomerization of olefins journal April 1974
Structure and reactivity relations in chromium carbonyl photoassisted hydrogenation of 1,3-dienes journal August 1973
Photo-induced hydrogenation of conjugated dienes catalyzed by chromium hexacarbonyl journal February 1971
Photocatalysis of hydrogenation and isomerization of alkenes by cis-HMn(CO)4PPh3 journal July 1984
Photolysis of matrix-isolated hydridotetracarbonylcobalt(I). Comparison of the probabilities of carbonyl loss with hydrogen atom loss journal February 1982
Photochemistry and photocatalytic activity of H4Ru4(CO)12 and H2Ru4(CO)13 for isomerization and hydrogenation of alkenes journal January 1982
Photochemically induced insertion of an olefin into the Co–Si bond; the key step for silylative coupling with vinylsubstituted organosilicon compounds journal December 1999
Photochemical hydroformylation catalysis using ruthenium complexes journal May 1986
Photochemical Hydroformylation journal April 1981
Photocontrolled Cobalt Catalysis for Selective Hydroboration of α,β‐Unsaturated Ketones journal September 2020
Iron- and Cobalt-Catalyzed Alkene Hydrogenation: Catalysis with Both Redox-Active and Strong Field Ligands journal May 2015
Catalytic Homogeneous Asymmetric Hydrogenation: Successes and Opportunities journal December 2018
Asymmetric Hydroformylation journal November 1995
Cobalt-Catalyzed Hydroformylation of Alkenes: Generation and Recycling of the Carbonyl Species, and Catalytic Cycle journal July 2009
Mn-, Fe-, and Co-Catalyzed Radical Hydrofunctionalizations of Olefins journal June 2016
Catalytic Homogeneous Asymmetric Hydrogenations of Largely Unfunctionalized Alkenes journal September 2005
Exploring the Alcohol Stability of Bis(phosphine) Cobalt Dialkyl Precatalysts in Asymmetric Alkene Hydrogenation journal November 2018
Hydrogenation of .alpha.-methylstyrene by hydridopentacarbonylmanganese (I). Evidence for a free-radical mechanism journal December 1977
Cyclopropylbenzyl radical clocks journal January 1989
Simple, Chemoselective Hydrogenation with Thermodynamic Stereocontrol journal January 2014
On the Mechanism of the Catalytic Binuclear Elimination Reaction in Hydroformylation Systems journal March 2015
Carbon monoxide exchange in pentacarbonyliron and tetracarbonyl(triphenylphosphine)iron journal May 1969
N–H Bond Formation in a Manganese(V) Nitride Yields Ammonia by Light-Driven Proton-Coupled Electron Transfer journal February 2019