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Antonio AM, Korman KJ, Deegan MM, Taggart GA, Yap GPA, Bloch ED. Utilization of a Mixed-Ligand Strategy to Tune the Properties of Cuboctahedral Porous Coordination Cages. Inorg Chem 2022; 61:4609-4617. [PMID: 35263080 DOI: 10.1021/acs.inorgchem.1c03519] [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] [Indexed: 11/29/2022]
Abstract
Ligand functionalization has been thoroughly leveraged to alter the properties of paddlewheel-based coordination cages where, in the case of ligand-terminated cages, functional groups are positioned on the periphery of synthesized cages. While these groups can be used to optimize solubility, porosity, crystal packing, thermal stability toward desolvation, reactivity, or optical activity, optimization of multiple properties can be challenging given their interconnected nature. For example, installation of functional groups to increase the solubility of porous cages typically has the effect of decreasing their porosity and stability toward thermal activation. Here we show that mixed-ligand cages can potentially address these issues as the benefits of various functional groups can be combined into one mixed-ligand cage. We further show that although ligand exchange reactions can be employed to obtain mixed ligand copper(II)-based cages, direct synthesis of mixed-ligand products is necessary for molybdenum(II) paddlewheel-based cages as these substitutionally inert clusters are resistant to ligand exchange. We ultimately show that highly soluble, highly porous, and thermally stable cuboctahedral cages are isolable by this strategy.
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Affiliation(s)
- Alexandra M Antonio
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Kyle J Korman
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Meaghan M Deegan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Garrett A Taggart
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Glenn P A Yap
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Eric D Bloch
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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2
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Deegan MM, Peters JC. Synthesis and functionalization reactivity of Fe-thiocarbonyl and thiocarbyne complexes. Polyhedron 2021; 209. [DOI: 10.1016/j.poly.2021.115461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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3
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Abstract
A large library of novel porous salts based on charged coordination cages was synthesized via straightforward salt metathesis reactions. For these, solutions of salts of oppositely charged coordination cages are mixed to precipitate MOF-like permanently porous products where metal identity, pore size, ligand functional groups, and surface area are highly tunable. For most of these materials, the constituent cages combine in the ratios expected based on their charge. Additional studies focused on the rate of salt metathesis or reaction stoichiometry as variables to tune particle size or product composition, respectively. It is expected that the design principles outlined here will be widely applicable for the synthesis of new porous salts based on a variety of charged porous molecular precursors.
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Affiliation(s)
- Aeri J Gosselin
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Alexandra M Antonio
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Kyle J Korman
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Meaghan M Deegan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Glenn P A Yap
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Eric D Bloch
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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4
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Abstract
The number of studies concerning the permanent porosity of molecular materials, especially porous organic cages (POCs) and porous coordination cages (PCCs), have increased substantially over the past decade. The work presented here outlines novel approaches to the preparation of porous molecular structures upon metalation of nonporous, amine-based organic cages. Reduction of the well-known CC3 and CC1 imine-based POCs affords nonporous, highly flexible amine cages. These materials can be endowed with significant levels of structural rigidity via post-synthetic metalation of their ethylenediamine-type binding pockets. The hybrid metal-organic cages accessed through this approach combine aspects of POC and PCC chemistry, with structures of this type providing a potentially promising new direction for the design and development of porous molecular materials with tunability in overall charge, metal cation, porosity, and solubility.
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Affiliation(s)
- Meaghan M Deegan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Rameswar Bhattacharjee
- Catalysis Center for Energy Innovation (CCEI), University of Delaware, Newark, Delaware 19716, United States
| | - Stavros Caratzoulas
- Catalysis Center for Energy Innovation (CCEI), University of Delaware, Newark, Delaware 19716, United States
| | - Eric D Bloch
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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5
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Dworzak MR, Deegan MM, Yap GPA, Bloch ED. Synthesis and Characterization of an Isoreticular Family of Calixarene-Capped Porous Coordination Cages. Inorg Chem 2021; 60:5607-5616. [PMID: 33784080 DOI: 10.1021/acs.inorgchem.0c03554] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Functionalization of permanently porous coordination cages has been used to tune phase, surface area, stability, and solubility in this promising class of adsorbents. For many cages, however, these properties are intricately tied together, and installation of functional groups, for example, to increase solubility often leads to a decrease in surface area. Calixarene-capped cages offer the advantage in that they are cluster-terminated cages whose solid-state packing, and thus surface area, is typically governed by the nature of the capping ligand rather than the bridging ligand. In this work we investigate the influence of ligand functionalization on two series of isoreticular Ni(II)- and Co(II)-based calixarene-capped cages. The two types of materials described are represented as octahedral and rectangular prismatic coordination cages and can be synthesized in a modular manner, allowing for the substitution of dicarboxylate bridging ligands and the introduction of functional groups in specific locations on the cage. We ultimately show that highly soluble cages can be obtained while still having access to high surface areas for many of the isolated phases.
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Affiliation(s)
- Michael R Dworzak
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Meaghan M Deegan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Glenn P A Yap
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Eric D Bloch
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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6
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Abstract
Although paddlewheel-based structures are common among permanently porous metal-organic materials, suitable strategies for the isolation of metal node-terminated, capped paddlewheel-based cage structures remain limited. We explored the use of chelating dicarboxylate ligand derivates (esp) for the isolation of trimesate-linked cages, Mo12(btc)4(esp)6, that are structural analogs of the small octahedral pore of HKUST-1. The porosity of these novel cages is appreciably higher than that of previously reported structures of this type. We also demonstrate that pillaring the isolated cage with DABCO generated an amorphous polymer that featured exceptional thermal stability and enhanced porosity.
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Affiliation(s)
- Meaghan M Deegan
- Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
| | - Eric D Bloch
- Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
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7
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Deegan MM, Dworzak MR, Gosselin AJ, Korman KJ, Bloch ED. Frontispiece: Gas Storage in Porous Molecular Materials. Chemistry 2021. [DOI: 10.1002/chem.202181464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Meaghan M. Deegan
- Department of Chemistry & Biochemistry University of Delaware Newark DE 19716 USA
| | - Michael R. Dworzak
- Department of Chemistry & Biochemistry University of Delaware Newark DE 19716 USA
| | - Aeri J. Gosselin
- Department of Chemistry & Biochemistry University of Delaware Newark DE 19716 USA
| | - Kyle J. Korman
- Department of Chemistry & Biochemistry University of Delaware Newark DE 19716 USA
| | - Eric D. Bloch
- Department of Chemistry & Biochemistry University of Delaware Newark DE 19716 USA
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8
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Deegan MM, Dworzak MR, Gosselin AJ, Korman KJ, Bloch ED. Gas Storage in Porous Molecular Materials. Chemistry 2021; 27:4531-4547. [PMID: 33112484 DOI: 10.1002/chem.202003864] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 10/25/2020] [Indexed: 02/06/2023]
Abstract
Molecules with permanent porosity in the solid state have been studied for decades. Porosity in these systems is governed by intrinsic pore space, as in cages or macrocycles, and extrinsic void space, created through loose, intermolecular solid-state packing. The development of permanently porous molecular materials, especially cages with organic or metal-organic composition, has seen increased interest over the past decade, and as such, incredibly high surface areas have been reported for these solids. Despite this, examples of these materials being explored for gas storage applications are relatively limited. This minireview outlines existing molecular systems that have been investigated for gas storage and highlights strategies that have been used to understand adsorption mechanisms in porous molecular materials.
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Affiliation(s)
- Meaghan M Deegan
- Department of Chemistry & Biochemistry, University of Delaware, Newark, DE, 19716, USA
| | - Michael R Dworzak
- Department of Chemistry & Biochemistry, University of Delaware, Newark, DE, 19716, USA
| | - Aeri J Gosselin
- Department of Chemistry & Biochemistry, University of Delaware, Newark, DE, 19716, USA
| | - Kyle J Korman
- Department of Chemistry & Biochemistry, University of Delaware, Newark, DE, 19716, USA
| | - Eric D Bloch
- Department of Chemistry & Biochemistry, University of Delaware, Newark, DE, 19716, USA
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9
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Affiliation(s)
- Meaghan M. Deegan
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Kareem I. Hannoun
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Jonas C. Peters
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
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10
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Deegan MM, Hannoun KI, Peters JC. Dihydrogen Adduct (Co–H
2
) Complexes Displaying H‐Atom and Hydride Transfer. Angew Chem Int Ed Engl 2020; 59:22631-22637. [DOI: 10.1002/anie.202009814] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Indexed: 12/18/2022]
Affiliation(s)
- Meaghan M. Deegan
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Kareem I. Hannoun
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
| | - Jonas C. Peters
- Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena CA 91125 USA
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11
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Korman KJ, Decker GE, Dworzak MR, Deegan MM, Antonio AM, Taggart GA, Bloch ED. Using Low-Pressure Methane Adsorption Isotherms for Higher-Throughput Screening of Methane Storage Materials. ACS Appl Mater Interfaces 2020; 12:40318-40327. [PMID: 32786240 DOI: 10.1021/acsami.0c11200] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A useful correlation between the low-pressure (up to 1.2 bar), low-temperature (195 K) and high-pressure (up to 65 bar), room temperature (298 K) methane storage properties of a range of porous materials is reported. Methane isotherms under these two sets of conditions show a remarkable agreement in both equilibrium adsorption and deliverable capacities for materials with pore volumes that are less than approximately 0.80 cm3/g. This trend holds well for the suite of metal-organic frameworks and porous coordination cages we studied, in addition to a zeolite and porous organic cage. Although it is well known that gravimetric gas storage capacity trends with gravimetric surface area, the 1.2 bar, 195 K excess adsorption capacity of a given framework is a better indicator of its room temperature, 65 bar capacity. Given the significantly smaller sample quantities needed for low-pressure measurements, greater accessibility to researchers around the world, accuracy of the measurement, and higher throughput, we envision this method as a rapid screening tool for the identification of methane storage materials. As excess/total adsorption and gravimetric/volumetric adsorption can be interconverted by simple utilization of the scalar quantities of pore volume or density, respectively, this method can be easily adapted to obtain both gravimetric and volumetric total adsorption capacities for a given adsorbent. In terms of volumetric methane adsorption, we further investigate the relationship between crystallographic and bulk density for the adsorbents studied here. With this analysis, it becomes apparent that in the absence of novel synthetic approaches, reported volumetric storage capacities should be viewed as an optimistic upper limit for a given material and not necessarily a true reflection of its actual adsorption properties as most MOFs have bulk densities that are less than half of their crystallographic values.
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Affiliation(s)
- Kyle J Korman
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Gerald E Decker
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Michael R Dworzak
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Meaghan M Deegan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Alexandra M Antonio
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Garrett A Taggart
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Eric D Bloch
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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12
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Deegan MM, Ahmed TS, Yap GPA, Bloch ED. Structure and redox tuning of gas adsorption properties in calixarene-supported Fe(ii)-based porous cages. Chem Sci 2020; 11:5273-5279. [PMID: 34122984 PMCID: PMC8159286 DOI: 10.1039/d0sc01833c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 05/04/2020] [Indexed: 01/18/2023] Open
Abstract
We describe the synthesis of Fe(ii)-based octahedral coordination cages supported by calixarene capping ligands. The most porous of these molecular cages has an argon accessible BET surface area of 898 m2 g-1 (1497 m2 g-1 Langmuir). The modular synthesis of molecular cages allows for straightforward substitution of both the bridging carboxylic acid ligands and the calixarene caps to tune material properties. In this context, the adsorption enthalpies of C2/C3 hydrocarbons ranged from -24 to -46 kJ mol-1 at low coverage, where facile structural modifications substantially influence hydrocarbon uptakes. These materials exhibit remarkable stability toward oxidation or decomposition in the presence of air and moisture, but application of a suitable chemical oxidant generates oxidized cages over a controlled range of redox states. This provides an additional handle for tuning the porosity and stability of the Fe cages.
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Affiliation(s)
- Meaghan M Deegan
- Department of Chemistry & Biochemistry, University of Delaware Newark DE 19716 USA
| | - Tonia S Ahmed
- Department of Chemistry and Chemical Biology, Harvard University 12 Oxford Street Cambridge MA 02138 USA
| | - Glenn P A Yap
- Department of Chemistry & Biochemistry, University of Delaware Newark DE 19716 USA
| | - Eric D Bloch
- Department of Chemistry & Biochemistry, University of Delaware Newark DE 19716 USA
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13
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Abstract
Despite efforts toward extending multiple bonding motifs to late metal systems, examples of late transition metal carbynes remain scarce. Herein, we describe the synthesis of a series of L3Co(CO) complexes supported by a trisphosphine ligand framework, with the most reduced of these complexes being amenable to O-functionalization. This transformation provides access to the second reported example of a terminal Co-carbyne complex, in this case stabilized in a pseudotetrahedral geometry (i.e., L3Co[triple bond, length as m-dash]C-OSiR3). Its geometry makes its electronic structure suitable for comparison to structurally-related examples of terminal Co-imido and oxo species.
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Affiliation(s)
- Meaghan M Deegan
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
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14
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Deegan MM, Peters JC. Electrophile-promoted Fe-to-N 2 hydride migration in highly reduced Fe(N 2)(H) complexes. Chem Sci 2018; 9:6264-6270. [PMID: 30123481 PMCID: PMC6063139 DOI: 10.1039/c8sc02380h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 06/26/2018] [Indexed: 11/21/2022] Open
Abstract
An emerging challenge in nitrogen fixation catalysis is the formation of hydride species, which can play a role in catalyst deactivation and unproductive hydrogen evolution. A new pathway for productive N–H bond formation from an iron hydride precursor is described.
One of the emerging challenges associated with developing robust synthetic nitrogen fixation catalysts is the competitive formation of hydride species that can play a role in catalyst deactivation or lead to undesired hydrogen evolution reactivity (HER). It is hence desirable to devise synthetic systems where metal hydrides can migrate directly to coordinated N2 in reductive N–H bond-forming steps, thereby enabling productive incorporation into desired reduced N2-products. Relevant examples of this type of reactivity in synthetic model systems are limited. In this manuscript we describe the migration of an iron hydride (Fe-H) to Nα of a disilylhydrazido(2-) ligand (Fe
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NNR2) derived from N2via double-silylation in a preceding step. This is an uncommon reactivity pattern in general; well-characterized examples of hydride/alkyl migrations to metal heteroatom bonds (e.g., (R)M
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NR′ → M–N(R)R′) are very rare. Mechanistic data establish the Fe-to-Nα hydride migration to be intramolecular. The resulting disilylhydrazido(1-) intermediate can be isolated by trapping with CNtBu, and the disilylhydrazine product can then be liberated upon treatment with an additional acid equivalent, demonstrating the net incorporation of an Fe-H equivalent into an N-fixed product.
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Affiliation(s)
- Meaghan M Deegan
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , CA 91125 , USA .
| | - Jonas C Peters
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , CA 91125 , USA .
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15
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Muldoon JA, Varga BR, Deegan MM, Chapp TW, Eördögh ÁM, Hughes RP, Glueck DS, Moore CE, Rheingold AL. Inversion of Configuration at the Phosphorus Nucleophile in the Diastereoselective and Enantioselective Synthesis of P‐Stereogenic
syn
‐Phosphiranes from Chiral Epoxides. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201801427] [Citation(s) in RCA: 2] [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: 11/09/2022]
Affiliation(s)
- Jake A. Muldoon
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Balázs R. Varga
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Meaghan M. Deegan
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Timothy W. Chapp
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Ádám M. Eördögh
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Russell P. Hughes
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - David S. Glueck
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Curtis E. Moore
- Department of Chemistry University of California San Diego 9500 Gilman Drive, La Jolla CA 92093 USA
| | - Arnold L. Rheingold
- Department of Chemistry University of California San Diego 9500 Gilman Drive, La Jolla CA 92093 USA
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16
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Deegan MM, Muldoon JA, Hughes RP, Glueck DS, Rheingold AL. Synthesis and Structure of Metal Complexes of P-Stereogenic Chiral Phosphiranes: An EDA-NOCV Analysis of the Donor–Acceptor Properties of Phosphirane Ligands. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00123] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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)
- Meaghan M. Deegan
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, New Hampshire 03755, United States
| | - Jake A. Muldoon
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, New Hampshire 03755, United States
| | - Russell P. Hughes
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, New Hampshire 03755, United States
| | - David S. Glueck
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, New Hampshire 03755, United States
| | - Arnold L. Rheingold
- Department of Chemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
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17
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Muldoon JA, Varga BR, Deegan MM, Chapp TW, Eördögh ÁM, Hughes RP, Glueck DS, Moore CE, Rheingold AL. Inversion of Configuration at the Phosphorus Nucleophile in the Diastereoselective and Enantioselective Synthesis of P‐Stereogenic
syn
‐Phosphiranes from Chiral Epoxides. Angew Chem Int Ed Engl 2018; 57:5047-5051. [DOI: 10.1002/anie.201801427] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Jake A. Muldoon
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Balázs R. Varga
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Meaghan M. Deegan
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Timothy W. Chapp
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Ádám M. Eördögh
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Russell P. Hughes
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - David S. Glueck
- Department of Chemistry Dartmouth College 6128 Burke Laboratory Hanover NH 03755 USA
| | - Curtis E. Moore
- Department of Chemistry University of California San Diego 9500 Gilman Drive, La Jolla CA 92093 USA
| | - Arnold L. Rheingold
- Department of Chemistry University of California San Diego 9500 Gilman Drive, La Jolla CA 92093 USA
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18
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Abstract
One of the major challenges associated with developing molecular Fischer-Tropsch catalysts is the design of systems that promote the formation of C-H bonds from H2 and CO while also facilitating the release of the resulting CO-derived organic products. To this end, we describe the synthesis of reduced iron-hydride/carbonyl complexes that enable an electrophile-promoted hydride migration process, resulting in the reduction of coordinated CO to a siloxymethyl (LnFe-CH2OSiMe3) group. Intramolecular hydride-to-CO migrations are extremely rare, and to our knowledge the system described herein is the first example where such a process can be accessed from a thermally stable M(CO)(H) complex. Further addition of H2 to LnFe-CH2OSiMe3 releases CH3OSiMe3, demonstrating net four-electron reduction of CO to CH3OSiMe3 at a single Fe site.
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Affiliation(s)
- Meaghan M Deegan
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Jonas C Peters
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
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