1
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Spivey JA, Collum DB. Potassium Hexamethyldisilazide (KHMDS): Solvent-Dependent Solution Structures. J Am Chem Soc 2024; 146:17827-17837. [PMID: 38901126 PMCID: PMC11373885 DOI: 10.1021/jacs.4c03418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
Solution structures of potassium hexamethyldisilazide [KHMDS] and labeled [15N]KHMDS were examined using a number of analytical methods including 29Si NMR spectroscopy and density functional theory computations. A combination of 15N-29Si couplings, 29Si chemical shifts, and the method of continuous variations reveals dimers, monomers, and ion pairs. Weakly coordinating monofunctional ligands such as toluene, N,N-dimethylethylamine, and Et3N afford exclusively dimers. 1,3-Dioxolane, THF, dimethoxyethane, hexamethylphosphoramide, and diglyme provide dimers at low ligand concentrations and monomers at high ligand concentrations. N,N,N',N'-Tetramethylethylenediamine and N,N,N',N'-tetramethylcyclohexanediamine provide exclusively dimers at all ligand concentrations at ambient temperatures and significant monomer at -80 °C. Studies of 12-crown-4 ran into technical problems. Equimolar 15-crown-5 forms a dimer, whereas excess 15-crown-5 affords a putative ion pair. Whereas equimolar 18-crown-6 also affords a dimer, an excess provides a monomer rather than a solvent-separated ion pair. [2.2.2]cryptand affords what is believed to be a contact-ion-paired cryptate. Solvation was probed using largely density functional theory (DFT) computations. Thermally corrected energies are consistent with lower aggregates and higher solvates at low temperatures, but the magnitudes of the computed temperature dependencies were substantially larger than the experimentally derived data.
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Affiliation(s)
- Jesse A Spivey
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
| | - David B Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States
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2
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Tomás Piqueras M, Howe HJ, Englehart SA, Williamson RM, Paul AM, Blight BA. High-yielding synthesis of cyclometallated iridium complexes with hydrogen bond-rich ligands. Chem Commun (Camb) 2023; 59:12727-12730. [PMID: 37800404 DOI: 10.1039/d3cc02296j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
A library of cyclometallated iridium(III) complexes with a strong H-bonding motif in their ancillary ligand was synthesized, characterized and their photophysical properties measured. Demonstrated herein is a general synthetic high yield procedure for these compounds. We ascribe these yields to the use of an intermediary primer ligand. This de novo strategy circumnavigates the standard synthetic issues of H-bond rich ligand precursors (self-aggregation and poor solubility in organic solvents).
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Affiliation(s)
| | - Holly J Howe
- Department of Chemistry, University of New Brunswick, Fredericton, NB, Canada.
| | - Sarah A Englehart
- Department of Chemistry, University of New Brunswick, Fredericton, NB, Canada.
| | - Robert M Williamson
- Department of Chemistry, University of New Brunswick, Fredericton, NB, Canada.
| | - Allyson M Paul
- Department of Chemistry, University of New Brunswick, Fredericton, NB, Canada.
| | - Barry A Blight
- Department of Chemistry, University of New Brunswick, Fredericton, NB, Canada.
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3
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Osipova ES, Kovalenko SA, Gulyaeva ES, Kireev NV, Pavlov AA, Filippov OA, Danshina AA, Valyaev DA, Canac Y, Shubina ES, Belkova NV. The Dichotomy of Mn-H Bond Cleavage and Kinetic Hydricity of Tricarbonyl Manganese Hydride Complexes. Molecules 2023; 28:molecules28083368. [PMID: 37110601 PMCID: PMC10143952 DOI: 10.3390/molecules28083368] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 04/04/2023] [Accepted: 04/08/2023] [Indexed: 04/29/2023] Open
Abstract
Acid-base characteristics (acidity, pKa, and hydricity, ΔG°H- or kH-) of metal hydride complexes could be a helpful value for forecasting their activity in various catalytic reactions. Polarity of the M-H bond may change radically at the stage of formation of a non-covalent adduct with an acidic/basic partner. This stage is responsible for subsequent hydrogen ion (hydride or proton) transfer. Here, the reaction of tricarbonyl manganese hydrides mer,trans-[L2Mn(CO)3H] (1; L = P(OPh)3, 2; L = PPh3) and fac-[(L-L')Mn(CO)3H] (3, L-L' = Ph2PCH2PPh2 (dppm); 4, L-L' = Ph2PCH2-NHC) with organic bases and Lewis acid (B(C6F5)3) was explored by spectroscopic (IR, NMR) methods to find the conditions for the Mn-H bond repolarization. Complex 1, bearing phosphite ligands, features acidic properties (pKa 21.3) but can serve also as a hydride donor (ΔG≠298K = 19.8 kcal/mol). Complex 3 with pronounced hydride character can be deprotonated with KHMDS at the CH2-bridge position in THF and at the Mn-H position in MeCN. The kinetic hydricity of manganese complexes 1-4 increases in the order mer,trans-[(P(OPh)3)2Mn(CO)3H] (1) < mer,trans-[(PPh3)2Mn(CO)3H] (2) ≈ fac-[(dppm)Mn(CO)3H] (3) < fac-[(Ph2PCH2NHC)Mn(CO)3H] (4), corresponding to the gain of the phosphorus ligand electron-donor properties.
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Affiliation(s)
- Elena S Osipova
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
| | - Sergey A Kovalenko
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
| | - Ekaterina S Gulyaeva
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
- LCC-CNRS, Université de Toulouse, CNRS, 205 Route de Narbonne, CEDEX 4, 31077 Toulouse, France
| | - Nikolay V Kireev
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
| | - Alexander A Pavlov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
- Center of National Technological Initiative, Bauman Moscow State Technical University, 2nd Baumanskaya Str., 5, 105005 Moscow, Russia
| | - Oleg A Filippov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
| | - Anastasia A Danshina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
- Moscow Institute of Physics and Technology, Institutskiy per., 9, 141700 Dolgoprudny, Russia
| | - Dmitry A Valyaev
- LCC-CNRS, Université de Toulouse, CNRS, 205 Route de Narbonne, CEDEX 4, 31077 Toulouse, France
| | - Yves Canac
- LCC-CNRS, Université de Toulouse, CNRS, 205 Route de Narbonne, CEDEX 4, 31077 Toulouse, France
| | - Elena S Shubina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
| | - Natalia V Belkova
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), 28, Vavilova Str., 119334 Moscow, Russia
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4
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Haim L, Robert F, Peres L, Lecante P, Philippot K, Poteau R, Respaud M, Amiens C. Correlation between surface chemistry and magnetism in iron nanoparticles. NANOSCALE ADVANCES 2021; 3:4471-4481. [PMID: 36133455 PMCID: PMC9419664 DOI: 10.1039/d1na00258a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 06/22/2021] [Indexed: 06/16/2023]
Abstract
To shed light on the factors governing the stability and surface properties of iron nanoparticles, a series of iron nanoparticles has been produced by hydrogenation of two different iron amido complexes: the bis[bis(trimethylsilyl)amido] Fe(ii), [Fe(N(SiMe3)2)2]2, and the bis(diphenylamido) Fe(ii), [Fe(NPh2)2]. Nanostructured materials of bcc structure, or nanoparticles displaying average sizes below 3 nm and a polytetrahedral structure, have been obtained. Depending on the synthesis conditions, the magnetization of the nanoparticles was either significantly lower than that of bulk iron, or much higher as for clusters elaborated under high vacuum conditions. Unexpectedly, hydrogenation of aromatic groups of the ligands of the [Fe(NPh2)2] precursor has been observed in some cases. Confrontation of the experimental results with DFT calculations made on polytetrahedral Fe91 model clusters bearing hydrides, amido and/or amine ligands at their surface, has shown that amido ligands can play a key role in the stabilisation of the nanoparticles in solution while the hydride surface coverage governs their surface magnetic properties. This study indicates that magnetic measurements give valuable indicators of the surface properties of iron nanoparticles in this size range, and beyond, of their potential reactivity.
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Affiliation(s)
- Lorraine Haim
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
- CEMES (Centre d'Elaboration de Matériaux et d'Etudes Structurales), CNRS 29 rue J. Marvig F-31055 Toulouse France
| | - François Robert
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
| | - Laurent Peres
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
| | - Pierre Lecante
- CEMES (Centre d'Elaboration de Matériaux et d'Etudes Structurales), CNRS 29 rue J. Marvig F-31055 Toulouse France
| | - Karine Philippot
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
| | - Romuald Poteau
- LPCNO (Laboratoire de Physique et Chimie des Nano-Objets), UMR 5215 INSA, CNRS, UPS 135 Avenue de Rangueil F-31077 Toulouse Cedex 4 France
| | - Marc Respaud
- CEMES (Centre d'Elaboration de Matériaux et d'Etudes Structurales), CNRS 29 rue J. Marvig F-31055 Toulouse France
- LPCNO (Laboratoire de Physique et Chimie des Nano-Objets), UMR 5215 INSA, CNRS, UPS 135 Avenue de Rangueil F-31077 Toulouse Cedex 4 France
| | - Catherine Amiens
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
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Mandigma MJP, Domański M, Barham JP. C-Alkylation of alkali metal carbanions with olefins. Org Biomol Chem 2020; 18:7697-7723. [PMID: 32785363 DOI: 10.1039/d0ob01180k] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
C-Alkylations of alkali metal carbanions with olefins, first reported five decades ago, is a class of reaction undergoing a resurgence in organic synthesis in recent years. As opposed to expectations from classical chemistry and transition metal-catalysis, here olefins behave as closed-shell electrophiles. Reactions range from highly reactive alkyllithiums giving rise to anionic polymerization, to moderately reactive alkylpotassium or alkylsodium compounds that give rise to defined, controlled and bimolecular chemistry. This review presents a brief historical overview on C-alkylation of alkali metal carbanions with olefins (typically mediated by KOtBu and KHMDS), highlights contemporary applications and features developing mechanistic understanding, thereby serving as a platform for future studies and the widespread use of this class of reaction in organic synthesis.
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Affiliation(s)
- Mark John P Mandigma
- Universität Regensburg, Fakultät für Chemie und Pharmazie, 93040 Regensburg, Germany.
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6
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Barham JP, Fouquet TNJ, Norikane Y. Base-catalyzed C-alkylation of potassium enolates with styrenes via a metal-ene reaction: a mechanistic study. Org Biomol Chem 2020; 18:2063-2075. [PMID: 32100777 DOI: 10.1039/c9ob02495f] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Base-catalyzed, C-alkylation of potassium (K) enolates with styrenes (CAKES) has recently emerged as a highly practical and convenient method for elaboration or synthesis of pharmaceutically-relevant cores. K enolate-type precursors such as alkyl-substituted heterocycles (pyridines, pyrazines and thiophenes), ketones, imines, nitriles and amides undergo C-alkylation reactions with styrene in the presence of KOtBu or KHMDS. Surprisingly, no studies have probed the reaction mechanism beyond the likely initial formation of a K enolate. Herein, a synergistic approach of computational (DFT), kinetic and deuterium labelling studies rationalizes various experimental observations and supports a metal-ene-type reaction for amide CAKES. Moreover, our approach explains experimental observations in other reported C-alkylation reactions of other enolate-type precursors, thus implicating a general mechanism for CAKES.
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Affiliation(s)
- Joshua P Barham
- National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
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7
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Bao W, Kossen H, Schneider U. Formal Allylic C(sp3)–H Bond Activation of Alkenes Triggered by a Sodium Amide. J Am Chem Soc 2017; 139:4362-4365. [DOI: 10.1021/jacs.7b01542] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei Bao
- EaStCHEM School of Chemistry, The University of Edinburgh, The King’s Buildings, David
Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Hanno Kossen
- EaStCHEM School of Chemistry, The University of Edinburgh, The King’s Buildings, David
Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Uwe Schneider
- EaStCHEM School of Chemistry, The University of Edinburgh, The King’s Buildings, David
Brewster Road, Edinburgh EH9 3FJ, U.K
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8
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Ojeda-Amador AI, Martínez-Martínez AJ, Robertson GM, Robertson SD, Kennedy AR, O'Hara CT. Exploring the solid state and solution structural chemistry of the utility amide potassium hexamethyldisilazide (KHMDS). Dalton Trans 2017; 46:6392-6403. [PMID: 28466908 DOI: 10.1039/c7dt01118k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The coordination chemistry of the important potassium amide KHMDS has been explored both in the solid state and in solution.
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Affiliation(s)
- Ana I. Ojeda-Amador
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | | | - Gemma M. Robertson
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | - Stuart D. Robertson
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | - Alan R. Kennedy
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | - Charles T. O'Hara
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
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9
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Douglas JJ, Churchill G, Slawin AMZ, Fox DJ, Smith AD. Stereo- and Chemodivergent NHC-Promoted Functionalisation of Arylalkylketenes with Chloral. Chemistry 2015; 21:16354-8. [PMID: 26406613 PMCID: PMC4648049 DOI: 10.1002/chem.201503308] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Indexed: 12/16/2022]
Abstract
Stereo- and chemodivergent enantioselective reaction pathways are observed upon treatment of alkylarylketenes and trichloroacetaldehyde (chloral) with N-heterocyclic carbenes, giving selectively either β-lactones (up to 88:12 dr, up to 94 % ee) or α-chloroesters (up to 94 % ee). Either 2-arylsubstitution or an α-branched iPr alkyl substituent within the ketene favours the chlorination pathway, allowing chloral to be used as an electrophilic chlorinating reagent in asymmetric catalysis.
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Affiliation(s)
- James J Douglas
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9ST (UK) http://ch-www.st-andrews.ac.uk/staff/ads/group/,Current Address: Small Molecule Design and Development, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285 (USA)
| | - Gwydion Churchill
- AstraZeneca, Pharmaceutical Development, Macclesfield, Cheshire, SK10 2NA (UK)
| | - Alexandra M Z Slawin
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9ST (UK) http://ch-www.st-andrews.ac.uk/staff/ads/group/
| | - David J Fox
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV7 4AL (UK).
| | - Andrew D Smith
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9ST (UK) http://ch-www.st-andrews.ac.uk/staff/ads/group/.
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10
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Mindiola DJ, Waterman R, Iluc VM, Cundari TR, Hillhouse GL. Carbon-hydrogen bond activation, C-N bond coupling, and cycloaddition reactivity of a three-coordinate nickel complex featuring a terminal imido ligand. Inorg Chem 2014; 53:13227-38. [PMID: 25437507 PMCID: PMC4269405 DOI: 10.1021/ic5026153] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Indexed: 11/29/2022]
Abstract
The three-coordinate imidos (dtbpe)Ni═NR (dtbpe = (t)Bu2PCH2CH2P(t)Bu2, R = 2,6-(i)Pr2C6H3, 2,4,6-Me3C6H2 (Mes), and 1-adamantyl (Ad)), which contain a legitimate Ni-N double bond as well as basic imido nitrogen based on theoretical analysis, readily deprotonate HC≡CPh to form the amide acetylide species (dtbpe)Ni{NH(Ar)}(C≡CPh). In the case of R = 2,6-(i)Pr2C6H3, reductive carbonylation results in formation of the (dtbpe)Ni(CO)2 along with the N-C coupled product keteneimine PhCH═C═N(2,6- (i)Pr2C6H3). Given the ability of the Ni═N bond to have biradical character as suggested by theoretical analysis, H atom abstraction can also occur in (dtbpe)Ni═N{2,6-(i)Pr2C6H3} when this species is treated with HSn((n)Bu)3. Likewise, the microscopic reverse reaction--conversion of the Ni(I) anilide (dtbpe)Ni{NH(2,6-(i)Pr2C6H3)} to the imido (dtbpe)Ni═N{2,6-(i)Pr2C6H3}--is promoted when using the radical Mes*O(•) (Mes* = 2,4,6-(t)Bu3C6H2). Reactivity studies involving the imido complexes, in particular (dtbpe)Ni═N{2,6-(i)Pr2C6H3}, are also reported with small, unsaturated molecules such as diphenylketene, benzylisocyanate, benzaldehyde, and carbon dioxide, including the formation of C-N and N-N bonds by coupling reactions. In addition to NMR spectroscopic data and combustion analysis, we also report structural studies for all the cycloaddition reactions involving the imido (dtbpe)Ni═N{2,6-(i)Pr2C6H3}.
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Affiliation(s)
- Daniel J. Mindiola
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Rory Waterman
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Vlad M. Iluc
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Thomas R. Cundari
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
- Department of Chemistry, Center for Advanced Scientific Computing
and Modeling (CASCaM), University of North
Texas, Denton, Texas 76203, United
States
| | - Gregory L. Hillhouse
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
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12
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Ketenes as Privileged Synthons in the Syntheses of Heterocyclic Compounds. Part 1. ADVANCES IN HETEROCYCLIC CHEMISTRY 2014. [DOI: 10.1016/b978-0-12-800170-7.00004-3] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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13
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Affiliation(s)
- Annette D. Allen
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Thomas T. Tidwell
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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Douglas J, Taylor JE, Churchill G, Slawin AMZ, Smith AD. NHC-Promoted Asymmetric β-Lactone Formation from Arylalkylketenes and Electron-Deficient Benzaldehydes or Pyridinecarboxaldehydes. J Org Chem 2013; 78:3925-38. [DOI: 10.1021/jo4003079] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James Douglas
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K
| | - James E. Taylor
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K
| | - Gwydion Churchill
- AstraZeneca, Process Research and Development, Macclesfield, Cheshire SK10 2NA, U.K
| | - Alexandra M. Z. Slawin
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K
| | - Andrew D. Smith
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K
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