1
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Jackman KMK, Liang G, Boyle PD, Zimmerman PM, Blacquiere JM. Changes in ligand coordination mode induce bimetallic C-C coupling pathways. Dalton Trans 2022; 51:3977-3991. [PMID: 35174382 PMCID: PMC8937615 DOI: 10.1039/d2dt00322h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbon-carbon coupling is one of the most powerful tools in the organic synthesis arsenal. Known methodologies primarily exploit monometallic Pd0/PdII catalytic mechanisms to give new C-C bonds. Bimetallic C-C coupling mechanisms that involve a PdI/PdII redox cycle, remain underexplored. Thus, a detailed mechnaistic understanding is imperative for the development of new bimetallic catalysts. Previously, a PdII-Me dimer (1) supported by L1, which has phosphine and 1-azaallyl donor groups, underwent reductive elimination to give ethane, a PdI dimer, a PdII monometallic complex, and Pd black. Herein, a comprehensive experimental and computational study of the reactivity of 1 is presented, which reveals that the versatile coordination chemistry of L1 promotes bimetallic C-C bond formation. The phosphine 1-azaallyl ligand adopts various bridging modes to maintain the bimetallic structure throughout the C-C bond forming mechanism, which involves intramolecular methyl transfer and 1,1-reductive elimination from one of the palladium atoms. The minor byproduct, methane, likely forms through a monometallic intermediate that is sensitive to solvent C-H activation. Overall, the capacity of L1 to adopt different coordination modes promotes the bimetallic C-C coupling channel through pathways that are unattainable with statically-coordinated ligands.
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Affiliation(s)
- Kyle M K Jackman
- Department of Chemistry, University of Western Ontario, London, Canada, N6A 5B7.
| | - Guangchao Liang
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.
| | - Paul D Boyle
- Department of Chemistry, University of Western Ontario, London, Canada, N6A 5B7.
| | - Paul M Zimmerman
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.
| | - Johanna M Blacquiere
- Department of Chemistry, University of Western Ontario, London, Canada, N6A 5B7.
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2
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Scott NWJ, Ford MJ, Husbands DR, Whitwood AC, Fairlamb IJS. Reactivity of a Dinuclear Pd I Complex [Pd 2(μ-PPh 2)(μ 2-OAc)(PPh 3) 2] with PPh 3: Implications for Cross-Coupling Catalysis Using the Ubiquitous Pd(OAc) 2/nPPh 3 Catalyst System. Organometallics 2021; 40:2995-3002. [PMID: 34539028 PMCID: PMC8441971 DOI: 10.1021/acs.organomet.1c00347] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Indexed: 01/13/2023]
Abstract
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[PdI2(μ-PPh2)(μ2-OAc)(PPh3)2] is
the reduction product
of PdII(OAc)2(PPh3)2,
generated by reaction of ‘Pd(OAc)2’ with
two equivalents of PPh3. Here, we report that the reaction
of [PdI2(μ-PPh2)(μ2-OAc)(PPh3)2] with PPh3 results
in a nuanced disproportionation reaction, forming [Pd0(PPh3)3] and a phosphinito-bridged PdI-dinuclear
complex, namely [PdI2(μ-PPh2){κ2-P,O-μ-P(O)Ph2}(κ-PPh3)2]. The latter complex is proposed to form by
abstraction of an oxygen atom from an acetate ligand at Pd. A mechanism
for the formal reduction of a putative PdII disproportionation
species to the observed PdI complex is postulated. Upon
reaction of the mixture of [Pd0(PPh)3] and [PdI2(μ-PPh2){κ2-P,O-μ-P(O)Ph2}(κ-PPh3)2] with 2-bromopyridine,
the former Pd0 complex undergoes a fast oxidative addition
reaction, while the latter dinuclear PdI complex converts
slowly to a tripalladium cluster, of the type [Pd3(μ-X)(μ-PPh2)2(PPh3)3]X, with an overall
4/3 oxidation state per Pd. Our findings reveal complexity
associated with the precatalyst activation step for the ubiquitous
‘Pd(OAc)2’/nPPh3 catalyst system,
with implications for cross-coupling catalysis.
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Affiliation(s)
- Neil W J Scott
- Department of Chemistry, University of York, Heslington, York, North Yorkshire YO10 5DD, United Kingdom
| | - Mark J Ford
- Bayer AG, Alfred-Nobel-Strasse 50, 40789 Monheim, Germany
| | - David R Husbands
- Department of Chemistry, University of York, Heslington, York, North Yorkshire YO10 5DD, United Kingdom
| | - Adrian C Whitwood
- Department of Chemistry, University of York, Heslington, York, North Yorkshire YO10 5DD, United Kingdom
| | - Ian J S Fairlamb
- Department of Chemistry, University of York, Heslington, York, North Yorkshire YO10 5DD, United Kingdom
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3
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Martinez EE, Moreno MR, Barksdale CA, Michaelis DJ. Effect of Precatalyst Oxidation State in C–N Cross-Couplings with 2-Phosphinoimidazole-Derived Bimetallic Pd(I) and Pd(II) Complexes. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Erin E. Martinez
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Mariur Rodriguez Moreno
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Caleb A. Barksdale
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - David J. Michaelis
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
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4
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5
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De S, Sivendran N, Maity B, Pirkl N, Koley D, Gooßen LJ. Dinuclear PdI Catalysts in Equilibrium Isomerizations: Mechanistic Understanding, in Silico Casting, and Catalyst Development. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05345] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sriman De
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741 246, India
| | - Nardana Sivendran
- Fakultät Chemie und Biochemie, Ruhr Universität Bochum, Universitätsstr. 150, 44801 Bochum, Germany
| | - Bholanath Maity
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741 246, India
| | - Nico Pirkl
- Fakultät Chemie und Biochemie, Ruhr Universität Bochum, Universitätsstr. 150, 44801 Bochum, Germany
| | - Debasis Koley
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741 246, India
| | - Lukas J. Gooßen
- Fakultät Chemie und Biochemie, Ruhr Universität Bochum, Universitätsstr. 150, 44801 Bochum, Germany
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6
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Correa-Ayala E, Campos-Alvarado C, Chávez D, Hernández-Ortega S, Morales-Morales D, Miranda-Soto V, Parra-Hake M. Dipalladium(I) complexes of ortho- and para-functionalized 1,3-bis(aryl)triazenide ligands: Synthesis, structure and catalytic activity. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.03.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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7
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Wang YT, Gao BB, Wang F, Liu SY, Yu H, Zhang WH, Lang JP. Palladium(ii) and palladium(ii)-silver(i) complexes with N-heterocyclic carbene and zwitterionic thiolate mixed ligands: synthesis, structural characterization and catalytic properties. Dalton Trans 2018; 46:1832-1839. [PMID: 28112320 DOI: 10.1039/c6dt04599e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The integration of a geometrically rigid Pd(ii), a coordinatively monotonous N-heterocyclic carbene 1,3-dimethylimidazoline-2-ylidene (IMe), and a flexible zwitterionic thiolate 4-(trimethylammonio)benzenethiolate (Tab) affords a class of Pd-IMe-Tab complexes with various nuclearities, namely, trans-[Pd(IMe)2(Tab)2](OTf)2 (2, mononuclear), cis-[Pd(IMe)2(Tab)2](OTf)(Cl) (3a, mononuclear), cis-[Pd(IMe)2(Tab)2](PF6)2·MeCN (3b·MeCN, mononuclear), [Pd2(IMe)4(Tab)2](PF6)4·2MeCN (4·2MeCN, dinuclear) and [Pd4(IMe)4(Tab)6](OTf)6(Cl)2 (5, tetranuclear). Further presence of Ag(i) in the assembly provides a heterometallic octanuclear cluster of [Pd4Ag4(IMe)8(Tab)10](PF6)12 (6). Compounds 2-6 are formed by the reaction of trans-Pd(IMe)2Cl2 (1) with various additional reagents via different reaction pathways. These compounds are characterized by means of FT-IR, 1H and 13C NMR, ESI-MS, elemental analysis and X-ray crystallography. Notably, the skeleton of compound 5 features a [Pd4S4] parallelogram wherein each of the four Pd(ii) centers bisects the edge defined by the S atoms. The main skeleton of compound 6 is an oval-shaped Pd4Ag4S10 unit, featuring an edge-fused norbornane-like (Pd2Ag4S6) framework appended by two additional PdS2 motifs at the polar positions. Compounds 5 and 6 also feature PdPd (5), PdAg and AgAg (6) interactions. Compound 5 as a representative example is highly effective at catalyzing Suzuki-Miyaura couplings in water, highlighting the potential of applying these types of homo- and heterometallic clusters as catalysts for organic transformations in environmentally benign media.
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Affiliation(s)
- Yu-Ting Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
| | - Bin-Bin Gao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
| | - Fan Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
| | - Shi-Yuan Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
| | - Hong Yu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
| | - Wen-Hua Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
| | - Jian-Ping Lang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China. and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
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8
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Kirlikovali KO, Cho E, Downard TJ, Grigoryan L, Han Z, Hong S, Jung D, Quintana JC, Reynoso V, Ro S, Shen Y, Swartz K, Ter Sahakyan E, Wixtrom AI, Yoshida B, Rheingold AL, Spokoyny AM. Buchwald–Hartwig amination using Pd(i) dimer precatalysts supported by biaryl phosphine ligands. Dalton Trans 2018; 47:3684-3688. [DOI: 10.1039/c8dt00119g] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We report the synthesis of air-stable Pd(i) dimer complexes featuring biaryl phosphine ligands.
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9
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Hung MU, Yang ST, Ramanathan M, Liu ST. Hydrogenation of nitroarenes catalyzed by a dipalladium complex. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.3976] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ming-Uei Hung
- Department of Chemistry; National Taiwan University; Taipei 106 Taiwan
| | - Shu-Ting Yang
- Department of Chemistry; National Taiwan University; Taipei 106 Taiwan
| | - Mani Ramanathan
- Department of Chemistry; National Taiwan University; Taipei 106 Taiwan
| | - Shiuh-Tzung Liu
- Department of Chemistry; National Taiwan University; Taipei 106 Taiwan
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10
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Jaworski JN, McCann SD, Guzei IA, Stahl SS. Detection of Palladium(I) in Aerobic Oxidation Catalysis. Angew Chem Int Ed Engl 2017; 56:3605-3610. [PMID: 28217896 PMCID: PMC5499979 DOI: 10.1002/anie.201700345] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Indexed: 11/07/2022]
Abstract
Palladium(II)-catalyzed oxidation reactions exhibit broad utility in organic synthesis; however, they often feature high catalyst loading and low turnover numbers relative to non-oxidative cross-coupling reactions. Insights into the fate of the Pd catalyst during turnover could help to address this limitation. Herein, we report the identification and characterization of a dimeric PdI species in two prototypical Pd-catalyzed aerobic oxidation reactions: allylic C-H acetoxylation of terminal alkenes and intramolecular aza-Wacker cyclization. Both reactions employ 4,5-diazafluoren-9-one (DAF) as an ancillary ligand. The dimeric PdI complex, [PdI (μ-DAF)(OAc)]2 , which features two bridging DAF ligands and two terminal acetate ligands, has been characterized by several spectroscopic methods, as well as single-crystal X-ray crystallography. The origin of this PdI complex and its implications for catalytic reactivity are discussed.
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Affiliation(s)
- Jonathan N. Jaworski
- Department of Chemistry, University of Wisconsin - Madison 1101 University Ave., Madison, WI 53706
| | - Scott D. McCann
- Department of Chemistry, University of Wisconsin - Madison 1101 University Ave., Madison, WI 53706
| | - Ilia A. Guzei
- Department of Chemistry, University of Wisconsin - Madison 1101 University Ave., Madison, WI 53706
| | - Shannon S. Stahl
- Department of Chemistry, University of Wisconsin - Madison 1101 University Ave., Madison, WI 53706
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11
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Jaworski JN, McCann SD, Guzei IA, Stahl SS. Detection of Palladium(I) in Aerobic Oxidation Catalysis. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700345] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jonathan N. Jaworski
- Department of Chemistry University of Wisconsin—Madison 1101 University Ave. Madison WI 53706 USA
| | - Scott D. McCann
- Department of Chemistry University of Wisconsin—Madison 1101 University Ave. Madison WI 53706 USA
| | - Ilia A. Guzei
- Department of Chemistry University of Wisconsin—Madison 1101 University Ave. Madison WI 53706 USA
| | - Shannon S. Stahl
- Department of Chemistry University of Wisconsin—Madison 1101 University Ave. Madison WI 53706 USA
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12
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Affiliation(s)
- Ian G. Powers
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Christopher Uyeda
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
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13
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Hazari N, Hruszkewycz DP. Dinuclear Pd(I) complexes with bridging allyl and related ligands. Chem Soc Rev 2016; 45:2871-99. [PMID: 27051890 DOI: 10.1039/c5cs00537j] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
There are many important synthetic methods that utilize palladium catalysts. In most of these reactions, the palladium species are proposed to exist exclusively in either the Pd(0) or Pd(II) oxidation states. However, in the last decade, dinuclear Pd(I) complexes have repeatedly been isolated from reaction mixtures previously suggested to involve only species in the Pd(0) and Pd(II) oxidation states. As a consequence, in order to design improved catalysts there is considerable interest in understanding the chemistry of dinuclear Pd(I) complexes. A significant proportion of the known dinuclear Pd(I) complexes are supported by bridging allyl or related ligands such as cyclopentadienyl or indenyl ligands. This review provides a detailed account of the synthesis, electronic structure and stoichiometric reactivity of dinuclear Pd(I) complexes with bridging allyl and related ligands. Additionally, it describes recent work where dinuclear Pd(I) complexes with bridging allyl ligands have been detected in catalytic reactions, such as cross-coupling, and discusses the potential implications for catalysis.
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Affiliation(s)
- Nilay Hazari
- The Department of Chemistry, Yale University, P. O. Box 208107, New Haven, Connecticut 06520, USA.
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14
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Böck K, Feil JE, Karaghiosoff K, Koszinowski K. Catalyst Activation, Deactivation, and Degradation in Palladium-Mediated Negishi Cross-Coupling Reactions. Chemistry 2015; 21:5548-60. [DOI: 10.1002/chem.201406408] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Indexed: 11/11/2022]
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15
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Oldenhof S, Lutz M, de Bruin B, van der Vlugt JI, Reek JNH. Well-Defined BisMETAMORPhos PdI–PdI Complex: Synthesis, Structural Characterization, and Reactivity. Organometallics 2014. [DOI: 10.1021/om5010622] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sander Oldenhof
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, Science
Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Martin Lutz
- Bijvoet
Center for Biomolecular Research, Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Bas de Bruin
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, Science
Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Jarl Ivar van der Vlugt
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, Science
Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Joost N. H. Reek
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, Science
Park 904, 1098 XH, Amsterdam, The Netherlands
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16
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Hruszkewycz DP, Balcells D, Guard LM, Hazari N, Tilset M. Insight into the efficiency of cinnamyl-supported precatalysts for the Suzuki-Miyaura reaction: observation of Pd(I) dimers with bridging allyl ligands during catalysis. J Am Chem Soc 2014; 136:7300-16. [PMID: 24824779 DOI: 10.1021/ja412565c] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Despite widespread use of complexes of the type Pd(L)(η(3)-allyl)Cl as precatalysts for cross-coupling, the chemistry of related Pd(I) dimers of the form (μ-allyl)(μ-Cl)Pd2(L)2 has been underexplored. Here, the relationship between the monomeric and the dimeric compounds is investigated using both experiment and theory. We report an efficient synthesis of the Pd(I) dimers (μ-allyl)(μ-Cl)Pd2(IPr)2 (allyl = allyl, crotyl, cinnamyl; IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) through activation of Pd(IPr)(η(3)-allyl)Cl type monomers under mildly basic reaction conditions. The catalytic performance of the Pd(II) monomers and their Pd(I) μ-allyl dimer congeners for the Suzuki-Miyaura reaction is compared. We propose that the (μ-allyl)(μ-Cl)Pd2(IPr)2-type dimers are activated for catalysis through disproportionation to Pd(IPr)(η(3)-allyl)Cl and monoligated IPr-Pd(0). The microscopic reverse comproportionation reaction of monomers of the type Pd(IPr)(η(3)-allyl)Cl with IPr-Pd(0) to form Pd(I) dimers is also studied. It is demonstrated that this is a facile process, and Pd(I) dimers are directly observed during catalysis in reactions using Pd(II) precatalysts. In these catalytic reactions, Pd(I) μ-allyl dimer formation is a deleterious process which removes the IPr-Pd(0) active species from the reaction mixture. However, increased sterics at the 1-position of the allyl ligand in the Pd(IPr)(η(3)-crotyl)Cl and Pd(IPr)(η(3)-cinnamyl)Cl precatalysts results in a larger kinetic barrier to comproportionation, which allows more of the active IPr-Pd(0) catalyst to enter the catalytic cycle when these substituted precatalysts are used. Furthermore, we have developed reaction conditions for the Suzuki-Miyaura reaction using Pd(IPr)(η(3)-cinnamyl)Cl which are compatible with mild bases.
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Affiliation(s)
- Damian P Hruszkewycz
- The Department of Chemistry, Yale University , P.O. Box 208107, New Haven, Connecticut 06520, United States
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17
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Bonney KJ, Schoenebeck F. Experiment and computation: a combined approach to study the reactivity of palladium complexes in oxidation states 0 toiv. Chem Soc Rev 2014; 43:6609-38. [DOI: 10.1039/c4cs00061g] [Citation(s) in RCA: 123] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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18
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Sarkar M, Doucet H, Bera JK. Room temperature C-H bond activation on a [Pd(I)-Pd(I)] platform. Chem Commun (Camb) 2014; 49:9764-6. [PMID: 24030737 DOI: 10.1039/c3cc44493g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heteroatom assisted C-H bond activation of 2-substituted naphthyridines with solvated Pd(I)2(CH3CN)6(BF4)2 provides bi- and trinuclear Pd(II) cyclometalated complexes, which provide valuable insight into potential intermediates in palladium catalyzed direct arylation reactions.
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Affiliation(s)
- Mithun Sarkar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India.
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19
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General and highly efficient fluorinated-N-heterocyclic carbene–based catalysts for the palladium-catalyzed Suzuki–Miyaura reaction. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.068] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Bhargava SK, Privér SH, Willis AC, Bennett MA. Preparation, Structure, and Reactivity of Dipalladium(I) Complexes Containing the Carbanion 2-C6F4PPh2: Coexistence of Distinct, Noninterconverting Head-to-Head [Dipalladium(0/II)] and Head-to-Tail [Dipalladium(I)] Species. Organometallics 2012. [DOI: 10.1021/om300525p] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Suresh K. Bhargava
- School of Applied Sciences (Applied
Chemistry), RMIT University, GPO Box 2476
V, Melbourne, Victoria 3001, Australia
| | - Steven H. Privér
- School of Applied Sciences (Applied
Chemistry), RMIT University, GPO Box 2476
V, Melbourne, Victoria 3001, Australia
| | - Anthony C. Willis
- Research School of Chemistry, Australian National University, Canberra, ACT 0200,
Australia
| | - Martin A. Bennett
- Research School of Chemistry, Australian National University, Canberra, ACT 0200,
Australia
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21
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Proutiere F, Aufiero M, Schoenebeck F. Reactivity and Stability of Dinuclear Pd(I) Complexes: Studies on the Active Catalytic Species, Insights into Precatalyst Activation and Deactivation, and Application in Highly Selective Cross-Coupling Reactions. J Am Chem Soc 2011; 134:606-12. [DOI: 10.1021/ja209424z] [Citation(s) in RCA: 144] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Fabien Proutiere
- Laboratory for Organic
Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich,
Switzerland
| | - Marialuisa Aufiero
- Laboratory for Organic
Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich,
Switzerland
| | - Franziska Schoenebeck
- Laboratory for Organic
Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich,
Switzerland
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22
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Das RK, Saha B, Rahaman SMW, Bera JK. Bimetallic catalysis involving dipalladium(I) and diruthenium(I) complexes. Chemistry 2011; 16:14459-68. [PMID: 20981670 DOI: 10.1002/chem.201001960] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Dipalladium(I) and diruthenium(I) compounds bridged by two [{(5,7-dimethyl-1,8-naphthyridin-2-yl)amino}carbonyl]ferrocene (L) ligands have been synthesized. The X-ray structures of [Pd(2)L(2)][BF(4)](2) (1) and [Ru(2)L(2)(CO)(4)][BF(4)](2) (2) reveal dinuclear structures with short metal-metal distances. In both of these structures, naphthyridine bridges the dimetal unit, and the site trans to the metal-metal bond is occupied by weakly coordinating oxygen from the amido fragment. The catalytic utilities of these bimetallic compounds are evaluated. Compound 1 is an excellent catalyst for phosphine-free, Suzuki cross-coupling reactions of aryl bromides with arylboronic acids and provides high yields in short reaction times. Compound 1 is also found to be catalytically active for aryl chlorides, although the corresponding yields are lower. A bimetallic mechanism is proposed, which involves the oxidative addition of aryl bromide across the Pd-Pd bond and the bimetallic reductive elimination of the product. Compound 1 is also an efficient catalyst for the Heck cross-coupling of aryl bromides with styrenes. The mechanism for aldehyde olefination with ethyl diazoacetate (EDA) and PPh(3), catalyzed by 2, has been fully elucidated. It is demonstrated that 2 catalyzes the formation of phosphorane utilizing EDA and PPh(3), which subsequently reacts with aldehyde to produce a new olefin and phosphine oxide. The efficacy of bimetallic complexes in catalytic organic transformations is illustrated in this work.
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Affiliation(s)
- Raj K Das
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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Moon ME, Choi Y, Lee YM, Vajpayee V, Trusova M, Filimonov VD, Chi KW. An expeditious and environmentally benign preparation of aryl halides from aryl amines by solvent-free grinding. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.10.099] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Boyd P, Edwards A, Gardiner M, Ho C, Lemée-Cailleau MH, McGuinness D, Riapanitra A, Steed J, Stringer D, Yates B. Reduction of a Chelating Bis(NHC) Palladium(II) Complex to [{μ-bis(NHC)}2Pd2H]+: A Terminal Hydride in a Binuclear Palladium(I) Species Formed under Catalytically Relevant Conditions. Angew Chem Int Ed Engl 2010; 49:6315-8. [DOI: 10.1002/anie.201003177] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Boyd P, Edwards A, Gardiner M, Ho C, Lemée-Cailleau MH, McGuinness D, Riapanitra A, Steed J, Stringer D, Yates B. Reduction of a Chelating Bis(NHC) Palladium(II) Complex to [{μ-bis(NHC)}2Pd2H]+: A Terminal Hydride in a Binuclear Palladium(I) Species Formed under Catalytically Relevant Conditions. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003177] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Frech CM, Leitus G, Milstein D. Processes Involved in the Reduction of a Cyclometalated Palladium(II) Complex. Organometallics 2008. [DOI: 10.1021/om7008815] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christian M. Frech
- Department of Inorganic Chemistry, University of Zurich, 8057 Zurich, Switzerland, and Department of Organic Chemistry and Department of Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Gregory Leitus
- Department of Inorganic Chemistry, University of Zurich, 8057 Zurich, Switzerland, and Department of Organic Chemistry and Department of Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - David Milstein
- Department of Inorganic Chemistry, University of Zurich, 8057 Zurich, Switzerland, and Department of Organic Chemistry and Department of Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel
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Li J, Hor TSA. Self-selected formation of a heteropolymetallic sandwich [Pd3Pt4(μ3-S)4(μ-dppy)4(dppy)4][PF6]3 from dinuclear addition across the [Pt2] and [Pd2] cores (dppy = 2-(diphenylphosphino)pyridine). Dalton Trans 2008:6619-23. [DOI: 10.1039/b812644e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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