401
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Han Z, Rong L, Wu J, Zhang L, Wang Z, Ding K. Catalytic Hydrogenation of Cyclic Carbonates: A Practical Approach from CO2and Epoxides to Methanol and Diols. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207781] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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402
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Han Z, Rong L, Wu J, Zhang L, Wang Z, Ding K. Catalytic Hydrogenation of Cyclic Carbonates: A Practical Approach from CO2and Epoxides to Methanol and Diols. Angew Chem Int Ed Engl 2012; 51:13041-5. [DOI: 10.1002/anie.201207781] [Citation(s) in RCA: 285] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Indexed: 11/06/2022]
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403
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Kumar S, Mani G, Mondal S, Chattaraj PK. Pyrrole-based new diphosphines: Pd and Ni complexes bearing the PNP pincer ligand. Inorg Chem 2012; 51:12527-39. [PMID: 23137009 DOI: 10.1021/ic301967r] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new class of diphosphine PNP pincer ligand, 2,5-bis(diphenylphosphinomethyl)pyrrole 2, was synthesized by the reaction between Ph2PH and 2,5-bis(dimethylaminomethyl)pyrrole in 90% yield. The analogous reaction of Ph2PH with 1,9-bis(dimethylaminomethyl)diphenyldipyrrolylmethane readily afforded a PNNP type diphosphine ligand, 1,9-bis(diphenylphosphinomethyl)diphenyldipyrrolylmethane 5 in 92% yield. These phosphine compounds were oxidized with H2O2 and S8 to give the corresponding phosphoryl and thiophosphoryl compounds 6-9 in very good yields. The reaction of the PNP pincer ligand 2 with [PdCl2(PhCN)2] in the presence of Et3N afforded the mononuclear Pd(II) complex, [PdCl{C4H2N-2,5-(CH2PPh2)2-κ(3)PNP}] 10 in 87% yield. Conversely, treatment of 2 with [PdCl2(PhCN)2] in the absence of Et3N gave the dinuclear Pd(II) complex [Pd2Cl4{μ-C4H3N-2,5-(CH2PPh2)2-κ(2)PP}2], the structure which is proposed based on the spectroscopic data. When 2 was treated with Pd(0) precursor [Pd2(dba)3]·CHCl3 the dinuclear Pd(I) complex [Pd2{μ-C4H2N-2,5-(CH2PPh2)2-κ(2)PN,κ(1)P}2], 12, was obtained in 23% yield. The formation of complex 12 is solvent dependent, which transforms into complex 10 in CDCl3 as studied by variable temperature (1)H and (31)P NMR methods. Treatment of 2 with [Ni(OAc)2]·4H2O gave the mononuclear Ni(II) pincer complex [Ni(OAc){C4H2N-2,5-(CH2PPh2)2-κ(3)PNP}], 13, which upon treatment with an excess of LiCl or LiBr or KI afforded the respective halide ion substituted Ni(II) complexes, [NiX{C4H2N-2,5-(CH2PPh2)2-κ(3)PNP}] (X = Cl, Br, and I), 14-16, in very good yields. The structures of 5, 2,5-bis(diphenylphosphorylmethyl)pyrrole 6, 10, 12, and 14-16 were determined by the single crystal X-ray diffraction method. In the structure of 12, two short contacts between the diagonally positioned Pd and P atoms are observed. To understand these weak interactions, density functional theory (DFT) calculations were done and an interaction MO diagram is presented.
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Affiliation(s)
- Shanish Kumar
- Department of Chemistry, Indian Institute of Technology , Kharagpur, India 721 302
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404
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Mitton SJ, Turculet L. Mild Reduction of Carbon Dioxide to Methane with Tertiary Silanes Catalyzed by Platinum and Palladium Silyl Pincer Complexes. Chemistry 2012; 18:15258-62. [DOI: 10.1002/chem.201203226] [Citation(s) in RCA: 135] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Indexed: 11/09/2022]
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405
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Suh HW, Schmeier TJ, Hazari N, Kemp RA, Takase MK. Experimental and Computational Studies of the Reaction of Carbon Dioxide with Pincer-Supported Nickel and Palladium Hydrides. Organometallics 2012. [DOI: 10.1021/om3008597] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hee-Won Suh
- The Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut
06520, United States
| | - Timothy J. Schmeier
- The Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut
06520, United States
| | - Nilay Hazari
- The Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut
06520, United States
| | - Richard A. Kemp
- Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131,
United States
- Sandia National Laboratories, Albuquerque, New Mexico,
United States
| | - Michael K. Takase
- The Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut
06520, United States
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406
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Sattler W, Parkin G. Zinc Catalysts for On-Demand Hydrogen Generation and Carbon Dioxide Functionalization. J Am Chem Soc 2012; 134:17462-5. [DOI: 10.1021/ja308500s] [Citation(s) in RCA: 212] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Wesley Sattler
- Department of Chemistry, Columbia University, New York, New York 10027, United
States
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, United
States
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407
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Sgro MJ, Stephan DW. Frustrated Lewis Pair Inspired Carbon Dioxide Reduction by a Ruthenium Tris(aminophosphine) Complex. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205741] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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408
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Sgro MJ, Stephan DW. Frustrated Lewis Pair Inspired Carbon Dioxide Reduction by a Ruthenium Tris(aminophosphine) Complex. Angew Chem Int Ed Engl 2012; 51:11343-5. [DOI: 10.1002/anie.201205741] [Citation(s) in RCA: 128] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 08/23/2012] [Indexed: 11/07/2022]
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409
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410
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Praneeth VKK, Ringenberg MR, Ward TR. Redox-Active Ligands in Catalysis. Angew Chem Int Ed Engl 2012; 51:10228-34. [DOI: 10.1002/anie.201204100] [Citation(s) in RCA: 277] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Indexed: 11/10/2022]
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411
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Vogt M, Gargir M, Iron MA, Diskin-Posner Y, Ben-David Y, Milstein D. A New Mode of Activation of CO2 by Metal-Ligand Cooperation with Reversible CC and MO Bond Formation at Ambient Temperature. Chemistry 2012; 18:9194-7. [DOI: 10.1002/chem.201201730] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Indexed: 11/11/2022]
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412
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Montag M, Zhang J, Milstein D. Aldehyde binding through reversible C-C coupling with the pincer ligand upon alcohol dehydrogenation by a PNP-ruthenium catalyst. J Am Chem Soc 2012; 134:10325-8. [PMID: 22703115 DOI: 10.1021/ja303121v] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Primary alcohol dehydrogenation by a PNP-Ru(II) catalyst was probed by low-temperature NMR experiments. Facile dehydrogenation occurred at -30 °C, but the resulting aldehydes were not found in solution, as they were trapped by the catalyst through a new mode of metal-ligand cooperation involving Ru-O coordination and an unusual, highly reversible C-C coupling with the PNP pincer ligand.
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Affiliation(s)
- Michael Montag
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76000, Israel
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413
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Feller M, Diskin-Posner Y, Shimon LJW, Ben-Ari E, Milstein D. N–H Activation by Rh(I) via Metal–Ligand Cooperation. Organometallics 2012. [DOI: 10.1021/om300248r] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Moran Feller
- Department
of Organic Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot,
76100, Israel
| | - Yael Diskin-Posner
- Department
of Organic Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot,
76100, Israel
| | - Linda J. W. Shimon
- Department
of Organic Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot,
76100, Israel
| | - Eyal Ben-Ari
- Department
of Organic Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot,
76100, Israel
| | - David Milstein
- Department
of Organic Chemistry and ‡Department of Chemical Research Support, The Weizmann Institute of Science, Rehovot,
76100, Israel
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414
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Motokura K, Kashiwame D, Miyaji A, Baba T. Copper-Catalyzed Formic Acid Synthesis from CO2 with Hydrosilanes and H2O. Org Lett 2012; 14:2642-5. [DOI: 10.1021/ol301034j] [Citation(s) in RCA: 149] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Ken Motokura
- Interdisciplinary Graduate School of Science and Engineering, Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan
| | - Daiki Kashiwame
- Interdisciplinary Graduate School of Science and Engineering, Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan
| | - Akimitsu Miyaji
- Interdisciplinary Graduate School of Science and Engineering, Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan
| | - Toshihide Baba
- Interdisciplinary Graduate School of Science and Engineering, Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan
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415
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Yang X. Metal Hydride and Ligand Proton Transfer Mechanism for the Hydrogenation of Dimethyl Carbonate to Methanol Catalyzed by a Pincer Ruthenium Complex. ACS Catal 2012. [DOI: 10.1021/cs3000683] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Xinzheng Yang
- Molecular Graphics and
Computation Facility,
College of Chemistry, University of California, Berkeley, California 94720, United States
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416
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Przyojski JA, Arman HD, Tonzetich ZJ. Complexes of Iron(II) and Iron(III) Containing Aryl-Substituted N-Heterocyclic Carbene Ligands. Organometallics 2012. [DOI: 10.1021/om300106u] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Jacob A. Przyojski
- Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249, United
States
| | - Hadi D. Arman
- Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249, United
States
| | - Zachary J. Tonzetich
- Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249, United
States
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417
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Hull JF, Himeda Y, Wang WH, Hashiguchi B, Periana R, Szalda DJ, Muckerman JT, Fujita E. Reversible hydrogen storage using CO2 and a proton-switchable iridium catalyst in aqueous media under mild temperatures and pressures. Nat Chem 2012; 4:383-8. [DOI: 10.1038/nchem.1295] [Citation(s) in RCA: 751] [Impact Index Per Article: 62.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Accepted: 02/06/2012] [Indexed: 02/07/2023]
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418
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Kang P, Cheng C, Chen Z, Schauer CK, Meyer TJ, Brookhart M. Selective electrocatalytic reduction of CO2 to formate by water-stable iridium dihydride pincer complexes. J Am Chem Soc 2012; 134:5500-3. [PMID: 22390391 DOI: 10.1021/ja300543s] [Citation(s) in RCA: 223] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Iridium dihydride complexes supported by PCP-type pincer ligands rapidly insert CO(2) to yield κ(2)-formate monohydride products in THF. In acetonitrile/water mixtures, these complexes become efficient and selective catalysts for electrocatalytic reduction of CO(2) to formate. Electrochemical and NMR spectroscopic studies have provided mechanistic details and structures of key intermediates.
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Affiliation(s)
- Peng Kang
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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419
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Gnanaprakasam B, Balaraman E, Gunanathan C, Milstein D. Synthesis of polyamides from diols and diamines with liberation of H2. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.25943] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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420
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Bontemps S, Vendier L, Sabo-Etienne S. Borane-Mediated Carbon Dioxide Reduction at Ruthenium: Formation of C1 and C2 Compounds. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107352] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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421
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Bontemps S, Vendier L, Sabo-Etienne S. Borane-mediated carbon dioxide reduction at ruthenium: formation of C1 and C2 compounds. Angew Chem Int Ed Engl 2012; 51:1671-4. [PMID: 22241554 DOI: 10.1002/anie.201107352] [Citation(s) in RCA: 166] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 11/28/2011] [Indexed: 11/10/2022]
Affiliation(s)
- Sébastien Bontemps
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, 31077 Toulouse, France
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422
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Ghorai D, Kumar S, Mani G. Mononuclear, helical binuclear palladium and lithium complexes bearing a new pyrrole-based NNN-pincer ligand: fluxional property. Dalton Trans 2012; 41:9503-12. [DOI: 10.1039/c2dt30816a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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423
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Tanaka R, Yamashita M, Chung LW, Morokuma K, Nozaki K. Mechanistic Studies on the Reversible Hydrogenation of Carbon Dioxide Catalyzed by an Ir-PNP Complex. Organometallics 2011. [DOI: 10.1021/om2010172] [Citation(s) in RCA: 258] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ryo Tanaka
- Department of Chemistry and Biotechnology, Graduate
School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656, Japan
| | - Makoto Yamashita
- Department of Chemistry and Biotechnology, Graduate
School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656, Japan
| | - Lung Wa Chung
- Fukui Institute
for Fundamental Chemistry, Kyoto University, Takano-Nishishiraki-cho, 34-4, Sakyo-ku,
Kyoto 606-8103, Japan
| | - Keiji Morokuma
- Fukui Institute
for Fundamental Chemistry, Kyoto University, Takano-Nishishiraki-cho, 34-4, Sakyo-ku,
Kyoto 606-8103, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate
School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656, Japan
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424
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Yang X. Unexpected direct reduction mechanism for hydrogenation of ketones catalyzed by iron PNP pincer complexes. Inorg Chem 2011; 50:12836-43. [PMID: 22103735 DOI: 10.1021/ic2020176] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The hydrogenation of ketones catalyzed by 2,6-bis(diisopropylphosphinomethyl)pyridine (PNP)-ligated iron pincer complexes was studied using the range-separated and dispersion-corrected ωB97X-D functional in conjunction with the all-electron 6-31++G(d,p) basis set. A validated structural model in which the experimental isopropyl groups were replaced with methyl groups was employed for the computational study. Using this simplified model, the calculated total free energy barrier of a previously postulated mechanism with the insertion of ketone into the Fe-H bond is far too high to account for the observed catalytic reaction. Calculation results reveal that the solvent alcohol is not only a stabilizer of the dearomatized intermediate but also more importantly an assistant catalyst for the formation of trans-(PNP)Fe(H)(2)(CO), the actual catalyst for hydrogenation of ketones. A direct reduction mechanism, which features the solvent-assisted formation of a trans dihydride complex trans-(PNP)Fe(H)(2)(CO), direct transfer of hydride to acetophenone from trans-(PNP)Fe(H)(2)(CO) for the formation of a hydrido alkoxo complex, and direct H(2) cleavage by hydrido alkoxo without the participation of the pincer ligand for the regeneration of trans-(PNP)Fe(H)(2)(CO), was predicted.
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Affiliation(s)
- Xinzheng Yang
- Molecular Graphics and Computation Facility, College of Chemistry, University of California, Berkeley, California 94720, USA.
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425
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Balaraman E, Fogler E, Milstein D. Efficient hydrogenation of biomass-derived cyclic di-esters to 1,2-diols. Chem Commun (Camb) 2011; 48:1111-3. [PMID: 22038098 DOI: 10.1039/c1cc15778g] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The unprecedented homogeneous hydrogenation of cyclic di-esters, in particular biomass-derived glycolide and lactide, to the corresponding 1,2-diols is catalyzed by Ru(II) PNN (1) and Ru(II) CNN (2) pincer complexes under mild hydrogen pressure and (in the case of 1) neutral conditions. No racemization was observed when a chiral di-ester was used.
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Affiliation(s)
- Ekambaram Balaraman
- Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
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