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Morton M, Tay BY, Mah JJ, White AJ, Nobbs JD, van Meurs M, Britovsek GJ. Hydrogen Activation with Ru-PN 3P Pincer Complexes for the Conversion of C 1 Feedstocks. Inorg Chem 2024; 63:3393-3401. [PMID: 38330919 PMCID: PMC10880058 DOI: 10.1021/acs.inorgchem.3c04001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 01/18/2024] [Accepted: 01/23/2024] [Indexed: 02/10/2024]
Abstract
The hydrogenation of C1 feedstocks (CO and CO2) has been investigated using ruthenium complexes [RuHCl(CO)(PN3P)] as the catalyst. PN3P pincer ligands containing amines in the linker between the central pyridine donor and the phosphorus donors with bulky substituents (tert-butyl (1) or TMPhos (2)) are required to obtain mononuclear single-site catalysts that can be activated by the addition of KOtBu to generate stable five-coordinate complexes [RuH(CO)(PN3P-H)], whereby the pincer ligand has been deprotonated. Activation of hydrogen takes place via heterolytic cleavage to generate [RuH2(CO)(PN3P)], but in the presence of CO, coordination of CO occurs preferentially to give [RuH(CO)2(PN3P-H)]. This complex can be protonated to give the cationic complex [RuH(CO)2(PN3P)]+, but it is unable to activate H2 heterolytically. In the case of the less coordinating CO2, both ruthenium complexes 1 and 2 are highly efficient as CO2 hydrogenation catalysts in the presence of a base (DBU), which in the case of the TMPhos ligand results in a TON of 30,000 for the formation of formate.
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Affiliation(s)
- Matthew
D. Morton
- Department
of Chemistry, Imperial College London, Molecular Sciences Research Hub,
White City Campus, 82 Wood Lane, London W12 0BZ, United
Kingdom
| | - Boon Ying Tay
- Institute
of Sustainability for Chemicals, Energy and Environment (ICSE2), Agency
for Science, Technology and Research (A*STAR), 1 Pesek Road Jurong Island, Singapore 627833, Republic of Singapore
| | - Justin J.Q. Mah
- Institute
of Sustainability for Chemicals, Energy and Environment (ICSE2), Agency
for Science, Technology and Research (A*STAR), 1 Pesek Road Jurong Island, Singapore 627833, Republic of Singapore
| | - Andrew J.P. White
- Department
of Chemistry, Imperial College London, Molecular Sciences Research Hub,
White City Campus, 82 Wood Lane, London W12 0BZ, United
Kingdom
| | - James D. Nobbs
- Institute
of Sustainability for Chemicals, Energy and Environment (ICSE2), Agency
for Science, Technology and Research (A*STAR), 1 Pesek Road Jurong Island, Singapore 627833, Republic of Singapore
| | - Martin van Meurs
- Institute
of Sustainability for Chemicals, Energy and Environment (ICSE2), Agency
for Science, Technology and Research (A*STAR), 1 Pesek Road Jurong Island, Singapore 627833, Republic of Singapore
| | - George J.P. Britovsek
- Department
of Chemistry, Imperial College London, Molecular Sciences Research Hub,
White City Campus, 82 Wood Lane, London W12 0BZ, United
Kingdom
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2
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Nobbs JD, Tay DWP, Yeap YH, Tiong YL, Ye S, Aitipamula S, Wang C, Cheong CB, van Meurs M. Dioxaphosphabicyclooctanes: small caged phosphines from tris(hydroxymethyl)phosphine. Dalton Trans 2023; 52:17954-17965. [PMID: 37982283 DOI: 10.1039/d3dt02577b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2023]
Abstract
Dioxaphosphabicyclo[2.2.2]octanes (L1-L4) have been prepared in a one-pot reaction from tris(hydroxymethyl)phosphine and various α,β-unsaturated ketones. The non-volatile phosphines oxidise very slowly in air. They possess highly upfield 31P chemical shifts (-59 to -70 ppm), small cone angles (121-140°) and a similar electronic parameter to PPh3. Reaction of L1 with [Rh(acac)(CO)2] gave the complex [Rh(acac)(CO)(L1)] with a ν(CO) of 1981.5 cm-1, whereas reaction L1 with [Rh(CO)2Cl]2 gave [Rh(CO)(L1)2Cl] with a ν(CO) of 1979.9 cm-1, remarkably similar to the CO stretching frequencies reported for analogous PPh3 complexes. The cage phosphines were explored as ligands in rhodium catalysed hydroformylation of 1-octene. All of the ligands gave a linear selectivity to n-nonanal of 68%, regardless of the substituents. However the ligand substituents had a significant effect on the catalyst activity, with increased steric bulk around the coordination environment giving a three-fold increase in aldehyde yield. The phosphines undergo ligand subsitution with [Pd(MeCN)2Cl2] forming square planar trans-[Pd(L)2Cl2] complexes. Subsequent reduction with hydrazine furnishes homoleptic tetravalent [Pd(L1)4] which was applied as a catalyst in Suzuki-Miyaura couplings, furnishing the C-C coupled products in moderate yields.
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Affiliation(s)
- James D Nobbs
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
| | - Dillon Wei Peng Tay
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
| | - Yoon Hui Yeap
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
| | - Yong Lun Tiong
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
| | - Suming Ye
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
| | - Srinivasulu Aitipamula
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
| | - Cun Wang
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
| | - Choon Boon Cheong
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
| | - Martin van Meurs
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
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Nobbs JD, Sugiarto S, See XY, Cheong CB, Aitipamula S, Stubbs LP, van Meurs M. Tetramethylphosphinane as a new secondary phosphine synthon. Commun Chem 2023; 6:85. [PMID: 37120598 PMCID: PMC10148838 DOI: 10.1038/s42004-023-00876-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 04/06/2023] [Indexed: 05/01/2023] Open
Abstract
Secondary phosphines are important building blocks in organic chemistry as their reactive P-H bond enables construction of more elaborate molecules. In particular, they can be used to construct tertiary phosphines that have widespread applications as organocatalysts, and as ligands in metal-complex catalysis. We report here a practical synthesis of the bulky secondary phosphine synthon 2,2,6,6-tetramethylphosphinane (TMPhos). Its nitrogen analogue tetramethylpiperidine, known for over a century, is used as a base in organic chemistry. We obtained TMPhos on a multigram scale from an inexpensive air-stable precursor, ammonium hypophosphite. TMPhos is also a close structural relative of di-tert-butylphosphine, a key component of many important catalysts. Herein we also describe the synthesis of key derivatives of TMPhos, with potential applications ranging from CO2 conversion to cross-coupling and beyond. The availability of a new core phosphine building block opens up a diverse array of opportunities in catalysis.
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Affiliation(s)
- James D Nobbs
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore, 627833, Republic of Singapore
| | - Sigit Sugiarto
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore, 627833, Republic of Singapore
| | - Xin Yi See
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore, 627833, Republic of Singapore
| | - Choon Boon Cheong
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore, 627833, Republic of Singapore
| | - Srinivasulu Aitipamula
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore, 627833, Republic of Singapore
| | - Ludger P Stubbs
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore, 627833, Republic of Singapore
| | - Martin van Meurs
- Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore, 627833, Republic of Singapore.
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Tay DWP, Nobbs JD, Aitipamula S, Britovsek GJP, van Meurs M. Directing Selectivity to Aldehydes, Alcohols, or Esters with Diphobane Ligands in Pd-Catalyzed Alkene Carbonylations. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dillon W. P. Tay
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research, Jurong Island, Singapore 627833
| | - James D. Nobbs
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research, Jurong Island, Singapore 627833
| | - Srinivasulu Aitipamula
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research, Jurong Island, Singapore 627833
| | - George J. P. Britovsek
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 82 Wood Lane, London W12 0BZ, United Kingdom
| | - Martin van Meurs
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research, Jurong Island, Singapore 627833
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5
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Tay DWP, Nobbs JD, Romain C, White AJP, Aitipamula S, van Meurs M, Britovsek GJP. gem-Dialkyl Effect in Diphosphine Ligands: Synthesis, Coordination Behavior, and Application in Pd-Catalyzed Hydroformylation. ACS Catal 2019. [DOI: 10.1021/acscatal.9b03007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Dillon W. P. Tay
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - James D. Nobbs
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology & Research, Jurong Island 627833, Singapore
| | - Charles Romain
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - Srinivasulu Aitipamula
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology & Research, Jurong Island 627833, Singapore
| | - Martin van Meurs
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology & Research, Jurong Island 627833, Singapore
| | - George J. P. Britovsek
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
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6
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Nobbs JD, Tomov AK, Young CT, White AJP, Britovsek GJP. From alternating to selective distributions in chromium-catalysed ethylene oligomerisation with asymmetric BIMA ligands. Catal Sci Technol 2018. [DOI: 10.1039/c7cy01896g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The oligomerisation of ethylene with chromium-based catalysts containing asymmetric BIMA (bis(benzimidazole)methylamine) ligands produces linear alpha olefins (LAOs) that follow an alternating distribution.
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7
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Zhao L, Pudasaini B, Genest A, Nobbs JD, Low CH, Stubbs LP, van Meurs M, Rösch N. Palladium-Catalyzed Hydroxycarbonylation of Pentenoic Acids. Computational and Experimental Studies on the Catalytic Selectivity. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02278] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lili Zhao
- Institute
of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore
| | - Bimal Pudasaini
- Institute
of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore
| | - Alexander Genest
- Institute
of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore
| | - James D. Nobbs
- Institute
of Chemical and Engineering Sciences, Agency for Science, Technology and Research, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore
| | - Choon Heng Low
- Institute
of Chemical and Engineering Sciences, Agency for Science, Technology and Research, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore
| | - Ludger Paul Stubbs
- Institute
of Chemical and Engineering Sciences, Agency for Science, Technology and Research, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore
| | - Martin van Meurs
- Institute
of Chemical and Engineering Sciences, Agency for Science, Technology and Research, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore
| | - Notker Rösch
- Institute
of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Singapore
- Catalysis
Research Center and Department Chemie, Technische Universität München, 85747 Garching, Germany
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8
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Nobbs JD, Low CH, Stubbs LP, Wang C, Drent E, van Meurs M. Isomerizing Methoxycarbonylation of Alkenes to Esters Using a Bis(phosphorinone)xylene Palladium Catalyst. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00813] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- James D. Nobbs
- Institute of Chemical and Engineering Sciences, Jurong Island, Singapore 627833
| | - Choon Heng Low
- Institute of Chemical and Engineering Sciences, Jurong Island, Singapore 627833
| | - Ludger P. Stubbs
- Institute of Chemical and Engineering Sciences, Jurong Island, Singapore 627833
| | - Cun Wang
- Institute of Chemical and Engineering Sciences, Jurong Island, Singapore 627833
| | - Eite Drent
- Leiden
Institute of Chemistry, Gorlaeus Laboratories, Leiden University, Einsteinweg
55, 2333 CC Leiden, The Netherlands
| | - Martin van Meurs
- Institute of Chemical and Engineering Sciences, Jurong Island, Singapore 627833
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Tomov AK, Nobbs JD, Chirinos JJ, Saini PK, Malinowski R, Ho SKY, Young CT, McGuinness DS, White AJP, Elsegood MRJ, Britovsek GJP. Alternating α-Olefin Distributions via Single and Double Insertions in Chromium-Catalyzed Ethylene Oligomerization. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00671] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Atanas K. Tomov
- Department
of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, U.K
| | - James D. Nobbs
- Department
of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, U.K
| | - Juan J. Chirinos
- Department
of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, U.K
| | - Prabhjot K. Saini
- Department
of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, U.K
| | - Robert Malinowski
- Department
of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, U.K
| | - Sarah K. Y. Ho
- Department
of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, U.K
| | - Craig T. Young
- Department
of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, U.K
| | - David S. McGuinness
- School
of Physical Sciences−Chemistry, University of Tasmania, Private
Bag 75, Hobart 7001, Australia
| | - Andrew J. P. White
- Department
of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, U.K
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10
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Nobbs JD, Zainal NZB, Tan J, Drent E, Stubbs LP, Li C, Lim SCY, Kumbang DGA, van Meurs M. Bio-based Pentenoic Acids as Intermediates to Higher Value-Added Mono- and Dicarboxylic Acids. ChemistrySelect 2016. [DOI: 10.1002/slct.201600136] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- James D. Nobbs
- Polymer Engineering & Characterisation; Institute of Chemical & Engineering Sciences, A*STAR; 1 Pesek Road Jurong Island Singapore. 627833
| | - Nur Zahirah Binte Zainal
- Polymer Engineering & Characterisation; Institute of Chemical & Engineering Sciences, A*STAR; 1 Pesek Road Jurong Island Singapore. 627833
| | - Jozel Tan
- Polymer Engineering & Characterisation; Institute of Chemical & Engineering Sciences, A*STAR; 1 Pesek Road Jurong Island Singapore. 627833
| | - Eite Drent
- Gorlaeus Laboratories; Leiden Institute of Chemistry; Leiden University; Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Ludger P. Stubbs
- Polymer Engineering & Characterisation; Institute of Chemical & Engineering Sciences, A*STAR; 1 Pesek Road Jurong Island Singapore. 627833
| | - Chuanzhao Li
- Polymer Engineering & Characterisation; Institute of Chemical & Engineering Sciences, A*STAR; 1 Pesek Road Jurong Island Singapore. 627833
- School of Engineering & Advanced Materials; Newcastle University; Newcastle upon Tyne UK NE177RU
| | - Sharon C. Y. Lim
- Polymer Engineering & Characterisation; Institute of Chemical & Engineering Sciences, A*STAR; 1 Pesek Road Jurong Island Singapore. 627833
| | - Daniel G. A. Kumbang
- Polymer Engineering & Characterisation; Institute of Chemical & Engineering Sciences, A*STAR; 1 Pesek Road Jurong Island Singapore. 627833
| | - Martin van Meurs
- Polymer Engineering & Characterisation; Institute of Chemical & Engineering Sciences, A*STAR; 1 Pesek Road Jurong Island Singapore. 627833
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Britovsek GJP, Malinowski R, McGuinness DS, Nobbs JD, Tomov AK, Wadsley AW, Young CT. Ethylene Oligomerization beyond Schulz–Flory Distributions. ACS Catal 2015. [DOI: 10.1021/acscatal.5b02203] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Robert Malinowski
- Department
of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
| | - David S. McGuinness
- School
of Physical Sciences-Chemistry, University of Tasmania, Private
Bag 75, Hobart 7001, Australia
| | - James D. Nobbs
- Department
of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
| | - Atanas K. Tomov
- Department
of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
| | - Andrew W. Wadsley
- Stochastic Simulation Ltd., 85 Guthrie
Street, Osborne Park, Perth 6017, Australia
| | - Craig T. Young
- Department
of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, U.K
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12
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Low CH, Nobbs JD, van Meurs M, Stubbs LP, Drent E, Aitipamula S, Pung MHL. Palladium Complexes with Bulky Diphosphine Ligands as Highly Selective Catalysts for the Synthesis of (Bio-) Adipic Acid from Pentenoic Acid Mixtures. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00517] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Choon Heng Low
- Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore 627833
| | - James D. Nobbs
- Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Martin van Meurs
- Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Ludger P. Stubbs
- Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Eite Drent
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Srinivasulu Aitipamula
- Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Michelle H. L. Pung
- Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore 627833
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13
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Whiteoak CJ, Nobbs JD, Kiryushchenkov E, Pagano S, White AJP, Britovsek GJP. Tri(pyridylmethyl)phosphine: the elusive congener of TPA shows surprisingly different coordination behavior. Inorg Chem 2013; 52:7000-9. [PMID: 23701515 DOI: 10.1021/ic4005196] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Tri(pyridylmethyl)phosphine (TPPh), the remarkably elusive congener of tri(pyridylmethyl)amine (TPA), has been prepared, as well as the relative tri(N-methyl-pyridylamino)phosphine (TPAMP). The coordination properties of these new ligands have been evaluated for chromium(III), iron(II), and ruthenium(II) complexes and compared with the related TPA complexes. In all cases, a different coordination behavior has been observed whereby TPPh and TPAMP always act as tridentate ligands. A chromium(III) complex [Cr(TPPh)Cl3] has been prepared, which has shown low ethylene oligomerization activity. Octahedral low spin iron(II) complexes [Fe(TPPh)2](2+) and [Fe(TPAMP)2](2+) were obtained with two ligands bound to the metal center. Ruthenium(II) chloro complexes of TPA and TPPh undergo ligand exchange reactions in acetonitrile, and the ruthenium(II) complex [Ru(MeCN)2(TPA)](2+) can be oxidized by m-CPBA in acetonitrile to give a transient ruthenium(IV) oxo complex [Ru(O)(MeCN)(TPA)](2+). Attempts to generate high valent ruthenium(IV) oxo TPPh or TPAMP complexes could not be achieved, probably due to insufficient stabilization by these strong field ligands.
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Affiliation(s)
- Christopher J Whiteoak
- Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AY, United Kingdom
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14
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Nobbs JD, Tomov AK, Cariou R, Gibson VC, White AJP, Britovsek GJP. Thio-Pybox and Thio-Phebox complexes of chromium, iron, cobalt and nickel and their application in ethylene and butadiene polymerisation catalysis. Dalton Trans 2012; 41:5949-64. [PMID: 22456597 DOI: 10.1039/c2dt30324h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of bis(thiazolinyl)- and bis(thiazolyl)pyridine Thio-Pybox ligands and their metal complexes of chromium(III), iron(II), cobalt(II) and nickel(II) has been prepared, as well as a nickel(II) complex containing a monoanionic bis(thiazolinyl)phenyl Thio-Phebox ligand. These new metal complexes have been characterised and used as catalysts, in combination with the co-catalyst MAO, for the polymerisation of ethylene and for the polymerisation of butadiene. In the case of ethylene polymerisation, the Thio-Pybox and Thio-Phebox metal complexes have shown relatively low polymerisation activities, much lower compared to the related bis(imino)pyridine complexes of the same metals. In the polymerisation of butadiene, several Thio-Pybox cobalt(II) complexes show very high activities, significantly higher than the other metal complexes with the same ligand. It is the metal, rather than the ligand, that appears to have the most profound effect on the catalytic activity in butadiene polymerisation, unlike in the polymerisation of ethylene, where bis(imino)pyridine ligands provide highly active catalysts for a range of 1st row transition metals.
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Affiliation(s)
- James D Nobbs
- Department of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
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