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Luo M, Zhang XH, Darensbourg DJ. Synthesis of cyclic monothiocarbonates via the coupling reaction of carbonyl sulfide (COS) with epoxides. Catal Sci Technol 2016. [DOI: 10.1039/c5cy00977d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two guanidine bases were used as organocatalysts for the synthesis of cyclic monothiocarbonates via the coupling reaction of carbonyl sulfide (COS) and epoxides.
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Affiliation(s)
- M. Luo
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - X.-H. Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
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Abstract
Polymer structures containing sulfur atoms can provide enhancement of important polymer properties compared to their oxygen-containing counterparts.
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Affiliation(s)
- M. Luo
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - X.-H. Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - D. J. Darensbourg
- Department of Chemistry
- Texas A&M University
- College Station
- Texas 77843
- USA
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Darensbourg DJ, Yeung AD. Kinetics of the (salen)Cr(iii)- and (salen)Co(iii)-catalyzed copolymerization of epoxides with CO2, and of the accompanying degradation reactions. Polym Chem 2015. [DOI: 10.1039/c4py01322k] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [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
The catalytic cycle of the (salen)M(iii)-catalyzed copolymerization for a variety of epoxides with CO2 is elucidated using computational chemistry, and factors that control the kinetics and product distribution of these reactions are described.
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Affiliation(s)
| | - A. D. Yeung
- Department of Chemistry
- Texas A&M University
- College Station
- USA
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Darensbourg DJ, Conder HL. Kinetic studies of phosphine and phosphite exchange reactions of substituted iron tricarbonyl carbene complexes. Competitive study of Lewis bases for the intermediate tricarbonyl(methyl ethyloxy carbene)iron. Inorg Chem 2002. [DOI: 10.1021/ic50132a028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Darensbourg MY, Conder HL, Darensbourg DJ, Hasday C. Electronic and steric control of reactions of benzylmagnesium chloride with substituted metal carbonyls. J Am Chem Soc 2002. [DOI: 10.1021/ja00799a015] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Froelich JA, Darensbourg DJ. Reaction of cationic Group 7B metal carbonyl derivatives with sodium hydrogen sulfide. Production of metal hydrides. Inorg Chem 2002. [DOI: 10.1021/ic50170a053] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Darensbourg DJ, Darensbourg MY, Walker N, Froelich JA, Barros HLC. Reaction of iron pentacarbonyl with oxygen-18-enriched hydroxide. Decarboxylation vs. oxygen exchange in the [Fe(COOH)] intermediate. Inorg Chem 2002. [DOI: 10.1021/ic50195a053] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cooper CB, Shriver DF, Darensbourg DJ, Froelich JA. Origin of the structure in M-H-M vibrational modes of decacarbonylhydroditungstate(1-). Inorg Chem 2002. [DOI: 10.1021/ic50195a055] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ewen J, Darensbourg DJ. Evidence for hydrogen-bonded intermediates in amine substitution reactions involving Group 6B metal pentacarbonyl amine derivatives with phosphines. J Am Chem Soc 2002. [DOI: 10.1021/ja00856a053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bond AM, Darensbourg DJ, Mocellin E, Stewart BJ. Electrochemical investigations of compounds having isomeric forms with similar standard redox potentials: oxidation of bis(tri-n-butylphosphine)molybdenum tetracarbonyl and related complexes. J Am Chem Soc 2002. [DOI: 10.1021/ja00413a008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Darensbourg DJ, Tappan JE, Nelson HH. Infrared intensities and calculation of infrared band shapes of the .nu.(carbonyl) and .nu.(carbon:carbon) vibrational modes in Group 6B (norbornadiene)tetracarbonylmetal derivatives. Inorg Chem 2002. [DOI: 10.1021/ic50169a006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Darensbourg DJ, Brown TL. Kinetics of the thermal decomposition and substitution reactions of molybdenum pentacarbonyl amine compounds. Inorg Chem 2002. [DOI: 10.1021/ic50066a053] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Atwood JL, Darensbourg DJ. Intramolecular hydrogen-bonding implications on the lability of the molybdenum-piperidine bond. Molecular structure of cis-Mo(CO)4[P(OCH3)3]NHC5H10. Inorg Chem 2002. [DOI: 10.1021/ic50175a032] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cotton FA, Darensbourg DJ, Kolthammer BWS. Chemical and x-ray structural studies on the (acetato)- and (trifluoroacetato)pentacarbonylmetalates of chromium and molybdenum. J Am Chem Soc 2002. [DOI: 10.1021/ja00392a026] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Darensbourg DJ, Darensbourg MY, Dennenberg RJ. Nature of the intermediate procreated in substitution reactions of Group VI metal carbonyls. J Am Chem Soc 2002. [DOI: 10.1021/ja00740a051] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ewen JA, Darensbourg DJ. Kinetic ambiguity between the Id and D mechanisms in ligand substitution reactions. The intimate mechanism for axial base-ligand exchange reactions in alkyl(base)cobaloximes and related species. J Am Chem Soc 2002. [DOI: 10.1021/ja00430a055] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Darensbourg DJ, Nelson HH. Stereospecific photochemical reactions of Group VIb metal tetracarbonyl norbornadiene complexes with carbon-13 monoxide. J Am Chem Soc 2002. [DOI: 10.1021/ja00827a043] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Drew D, Darensbourg DJ, Darensbourg MY. Synthesis, spectral properties, and reactions of manganese and rhenium pentacarbonyl phosphine and phosphite cation derivatives and related complexes. Inorg Chem 2002. [DOI: 10.1021/ic50149a027] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Darensbourg DJ, Nelson HH, Hyde CL. Detailed analysis of the carbonyl stretching vibrations in axial and equatorial substituted iron carbonyl compounds. Absolute infrared intensities and force constants of the carbonyl ligands. Inorg Chem 2002. [DOI: 10.1021/ic50139a017] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Darensbourg MY, Darensbourg DJ, Burns D, Drew DA. Infrared, conductance, and kinetic evidence for alkali metal ion interactions with derivatives of manganese carbonylates. J Am Chem Soc 2002. [DOI: 10.1021/ja00427a011] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Darensbourg DJ, Adams MJ, Yarbrough JC. Toward the design of double metal cyanides for the copolymerization of CO(2) and epoxides. Inorg Chem 2001; 40:6543-4. [PMID: 11735460 DOI: 10.1021/ic0155941] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [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)
- D J Darensbourg
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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Darensbourg DJ, Lee WZ, Yarbrough JC. Synthesis and characterization of a monocyanide-bridged bimetallic iron(II) and copper(I) complex. Inorg Chem 2001; 40:6533-6. [PMID: 11720517 DOI: 10.1021/ic010683z] [Citation(s) in RCA: 8] [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: 11/28/2022]
Affiliation(s)
- D J Darensbourg
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, TX 77842-3012, USA
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Darensbourg DJ, Wildeson JR, Yarbrough JC, Taylor RE. Tricyclohexylphosphine derivatives of bis(2,6-difluorophenoxide)cadmium: a solution and solid-state NMR study. Inorg Chem 2001; 40:3639-42. [PMID: 11421721 DOI: 10.1021/ic010104q] [Citation(s) in RCA: 8] [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: 11/28/2022]
Affiliation(s)
- D J Darensbourg
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, USA
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Darensbourg DJ, Frost BJ, Larkins DL. An experimental and theoretical investigation of the carbon dioxide insertion process into the tungsten-nitrogen bond of an anionic W(0) complex. Inorg Chem 2001; 40:1993-9. [PMID: 11304140 DOI: 10.1021/ic001006s] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The pyridine bound 2-aminopyridine (2APH) derivative of tungsten pentacarbonyl has been prepared from photogenerated W(CO)5THF and 2APH. Deprotonation of the distal amine group by sodium hydride has provided two complexes, [Na][W(CO)5(2AP)] and [Na]2[W(CO)4(2AP)]2. Both complexes have been characterized by X-ray crystallography with the monomeric derivative being crystallized as its [Na2(18-crown-6)][W(CO)5(2AP)]2 salt which exhibits strong Na+...-NH interactions. Photolysis of W(CO)6 in the presence of excess 2-aminopyridine in THF has led to an efficient synthesis of the chelated neutral derivative, W(CO)4(2APH).2APH, where the extra equivalent of 2APH is hydrogen bonded to its bound counterpart. The 2-aminopyridine molecule of solvation was almost quantitatively removed via aqueous washings. Deprotonation of W(CO)4(2APH) with NaH afforded the amidopyridine derivative which was shown to rapidly undergo reaction with CO2 to yield the chelated carbamate complex, W(CO)4(OC(O)2AP)-. Nevertheless, because of the presence of small quantities of free 2-aminopyridine during the reactions with CO2, we have not been able to conclusively rule out participation by a ligand substitution process involving NC5H4NHCOOH. Ab initio computations were found to substantiate many of these experimental observations. That is, in the monodentate bound W(CO)5(2APH) derivative, binding through the pyridine nitrogen atom is favored by about 29 kJ/mol over the amine nitrogen atom, whereas the opposite site for binding is preferred for the deprotonated amido analogue, W(CO)5(2AP)-. Furthermore, both forms of W(CO)5(2AP)- were found to be more stable than the chelated tungsten tetracarbonyl anion plus CO. On the other hand, CO2 insertion into the W(CO)4(2AP)- anion to provide the chelated carbamate, W(CO)4(OC(O)2AP)-, was thermodynamically favored by >110 kJ/mol. Finally, both experimental and theoretical studies were inconclusive with regard to identifying reaction intermediates during the CO2 insertion pathway which involve prior interactions of CO2 at the amido nitrogen center.
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Affiliation(s)
- D J Darensbourg
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, USA
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Darensbourg DJ, Zimmer MS, Rainey P, Larkins DL. Solution and solid-state structures of phosphine adducts of monomeric zinc bisphenoxide complexes. Importance of these derivatives in CO2/epoxide copolymerization processes. Inorg Chem 2000; 39:1578-85. [PMID: 12526468 DOI: 10.1021/ic990594a] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Phosphine derivatives of the monomeric zinc phenoxide complexes, (phenoxide)2ZnLn, where phenoxide equals 2,6-di-tert-butylphenoxide, 2,4,6-tri-tert-butylphenoxide, and 2,6-diphenylphenoxide and n = 1 or 2, have been synthesized from the reaction of Zn[N(SiMe3)2]2 and the corresponding phenol followed by the addition of phosphine. The complexes have been characterized in solution by 31P NMR spectroscopy and in selected instances in the solid-state by X-ray crystallography. The small, basic phosphine, PMe3, provided the only case of an isolated complex possessing two phosphine ligands (i.e., n = 2). For all other larger phosphines only the monophosphine adducts were obtained. Furthermore, only fairly basic phosphines were found to bind to zinc, e.g., whereas PPh3 (pKa = 2.73) was ineffective, PPh2Me (pKa = 4.57) did form a strong bond to zinc. The solid-state structures of the monophosphine adducts consist of a near-trigonal planar geometry about the zinc center, where the average P-Zn-O angles are larger than the O-Zn-O angles. On the other hand, the bisphosphine adduct, Zn(O-2,4,6-tBu3C6H2)(2).2PMe3, is a distorted tetrahedral structure with O-Zn-O and P-Zn-P bond angles of 108.8(2) degrees and 107.1(9) degrees, respectively. Competitive phosphine binding studies monitored by 31P NMR spectroscopy provided a relative binding order of PPh3 approximately PtBu3 << PPh2Me < PCy3 < PMe2Ph < PnBu3 < PEt3 < PMe3. Hence, the relative binding of basic phosphine ligands at these congested zinc sites is largely determined by their steric requirements. All phosphine adducts, with the exception of PMe2Ph and PMe3, were found to undergo slow self-exchange (< 600 s-1) with free phosphine by 31P NMR spectroscopy. However, the two small phosphines, PMe2Ph (cone angle = 122 degrees) and PMe3 (cone angle = 118 degrees), were shown to undergo rapid exchange presumably via an associative mechanism. Although there was no kinetic preferences for PCy3 binding to cadmium vs zinc, cadmium was thermodynamically favored by about a factor of 2.5. The addition of up to 3 equiv of PCy3 to the Zn(O-2,6-tBu2C6H3)2 or Zn(O-2,4,6-tBu3C6H2)2 derivatives did not significantly alter the reactivity of these catalysts for the copolymerization of cyclohexene oxide (CHO) and CO2 to high-molecular weight poly(cyclohexene carbonate). However, the presence of PCy3 greatly retarded their ability to homopolymerize CHO to polyether or to afford polyether linkages during the copolymerization of CHO/CO2.
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Affiliation(s)
- D J Darensbourg
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA
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Darensbourg DJ, Niezgoda SA, Draper JD, Reibenspies JH. Mechanistic Aspects of the Copolymerization of CO2 and Epoxides by Soluble Zinc Bis(phenoxide) Catalysts as Revealed by Their Cadmium Analogues. J Am Chem Soc 1998. [DOI: 10.1021/ja9801487] [Citation(s) in RCA: 68] [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)
- D. J. Darensbourg
- Contribution from the Department of Chemistry, Texas A&M University, P.O. Box 300012, College Station, Texas 77842
| | - S. A. Niezgoda
- Contribution from the Department of Chemistry, Texas A&M University, P.O. Box 300012, College Station, Texas 77842
| | - J. D. Draper
- Contribution from the Department of Chemistry, Texas A&M University, P.O. Box 300012, College Station, Texas 77842
| | - J. H. Reibenspies
- Contribution from the Department of Chemistry, Texas A&M University, P.O. Box 300012, College Station, Texas 77842
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Darensbourg DJ, Hyde CL. Infrared intensity measurements of the Pt‐H stretching vibration in Pt(II) complexes and their relationship to similar measurements for hydrogen chemisorbed on platinum. J Chem Phys 1973. [DOI: 10.1063/1.1680568] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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