526
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Cai X, Majumdar S, Fortman GC, Cazin CSJ, Slawin AMZ, Lhermitte C, Prabhakar R, Germain ME, Palluccio T, Nolan SP, Rybak-Akimova EV, Temprado M, Captain B, Hoff CD. Oxygen Binding to [Pd(L)(L′)] (L= NHC, L′ = NHC or PR3, NHC = N-Heterocyclic Carbene). Synthesis and Structure of a Paramagnetic trans-[Pd(NHC)2(η1-O2)2] Complex. J Am Chem Soc 2011; 133:1290-3. [DOI: 10.1021/ja1103348] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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527
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Cheng G, Slawin AMZ, Vautravers NR, André P, Morris RE, Samuel IDW, Cole-Hamilton D. Synthesis of hybrid dendritic molecules with diazaphospholidine oxide grafted at the surface of octavinylsilsesquioxane (OVS). Org Biomol Chem 2011; 9:1189-200. [DOI: 10.1039/c0ob00297f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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528
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Dupuy S, Lazreg F, Slawin AMZ, Cazin CSJ, Nolan SP. Decarboxylation of aromatic carboxylic acids by gold(i)-N-heterocyclic carbene (NHC) complexes. Chem Commun (Camb) 2011; 47:5455-7. [DOI: 10.1039/c1cc10917k] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A recently isolated gold(i) complex, [Au(IPr)(OH)], permits the transformation of carboxylic acids to the corresponding decarboxylated gold(i)-aryl complex without the use of silver co-catalyst under mild reaction conditions.
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529
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Banerjee S, Nandy M, Sen S, Mandal S, Rosair GM, Slawin AMZ, Gómez García CJ, Clemente-Juan JM, Zangrando E, Guidolin N, Mitra S. Isolation of four new CoII/CoIII and NiII complexes with a pentadentate Schiff base ligand: syntheses, structural descriptions and magnetic studies. Dalton Trans 2011; 40:1652-61. [DOI: 10.1039/c0dt00923g] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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530
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Fuentes JA, Lebl T, Slawin AMZ, Clarke ML. Synthesis of organocatalysts using non-covalent chemistry; understanding the reactivity of ProNap, an enamine-type organocatalyst that can self assemble with complementary co-catalysts. Chem Sci 2011. [DOI: 10.1039/c1sc00299f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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531
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Campbell CD, Collett CJ, Thomson JE, Slawin AMZ, Smith AD. Organic base effects in NHC promoted O- to C-carboxyl transfer; chemoselectivity profiles, mechanistic studies and domino catalysis. Org Biomol Chem 2011; 9:4205-18. [DOI: 10.1039/c1ob05160a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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532
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Wragg DS, Fullerton GM, Byrne PJ, Slawin AMZ, Warren JE, Teat SJ, Morris RE. Solvothermal aluminophosphate zeotype synthesis with ionic liquid precursors. Dalton Trans 2011; 40:4926-32. [DOI: 10.1039/c0dt01788d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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533
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McBurney RT, Slawin AMZ, Smart LA, Yu Y, Walton JC. UV promoted phenanthridine syntheses from oxime carbonate derived iminyl radicals. Chem Commun (Camb) 2011; 47:7974-6. [DOI: 10.1039/c1cc12720a] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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534
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Durie AJ, Slawin AMZ, Lebl T, Kirsch P, O'Hagan D. Synthesis and structure of all-syn-1,2,3,4-tetrafluorocyclohexane. Chem Commun (Camb) 2011; 47:8265-7. [DOI: 10.1039/c1cc13016a] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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535
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Räisänen MT, Nieger M, Slawin AMZ, Leskelä M, Repo T. Two- and three-dimensional packing diagrams of M(salophen) complexes. CrystEngComm 2011. [DOI: 10.1039/c0ce00926a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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536
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Schmid TE, Bantreil X, Citadelle CA, Slawin AMZ, Cazin CSJ. Phosphites as ligands in ruthenium-benzylidene catalysts for olefin metathesis. Chem Commun (Camb) 2011; 47:7060-2. [DOI: 10.1039/c1cc10825e] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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537
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Truscott BJ, Fortman GC, Slawin AMZ, Nolan SP. Well-defined [Rh(NHC)(OH)] complexes enabling the conjugate addition of arylboronic acids to α,β-unsaturated ketones. Org Biomol Chem 2011; 9:7038-41. [DOI: 10.1039/c1ob06112g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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538
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Medda F, Joseph TL, Pirrie L, Higgins M, Slawin AMZ, Lain S, Verma C, Westwood NJ. N1-Benzyl substituted cambinol analogues as isozyme selective inhibitors of the sirtuin family of protein deacetylases. MEDCHEMCOMM 2011. [DOI: 10.1039/c1md00023c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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539
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Ramón RS, Gaillard S, Poater A, Cavallo L, Slawin AMZ, Nolan SP. [{Au(IPr)}2(μ-OH)]X complexes: synthetic, structural and catalytic studies. Chemistry 2010; 17:1238-46. [PMID: 21243690 DOI: 10.1002/chem.201002607] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Indexed: 11/11/2022]
Abstract
The synthesis of a series of dinuclear gold hydroxide complexes has been achieved. These complexes of type [{Au(IPr)}(2)(μ-OH)]X (X=BF(4), NTf(2), OTf, FABA, SbF(6); IPr=2,6-bis(disopropylphenyl)imidazol-2-ylidene; NTf(2)=bis(trifluoromethanesulfonyl)imidate; OTf=trifluoromethanesulfonate; FABA=tetrakis(pentafluorophenyl)borate) are easily formed in the presence of water and prove highly efficient in the catalytic hydration of nitriles. Their facile formation in aqueous media suggests they are of relevance in gold-catalyzed reactions involving water. Additionally, a series of [Au(IPr)(NCR)][BF(4)] (R=alkyl, aryl) complexes was synthesized as they possibly occur as intermediates in the catalytic reaction mechanism. (1)H and (13)C NMR data as well as key bond lengths obtained by X-ray diffraction studies are compared and reveal an interesting structure-activity relationship. The collected data indicate a negligible effect of the nature of the nitrile on the reactivity of [Au(L)(NCR)][X] complexes in catalysis.
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540
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Urbina-Blanco CA, Bantreil X, Clavier H, Slawin AMZ, Nolan SP. Backbone tuning in indenylidene-ruthenium complexes bearing an unsaturated N-heterocyclic carbene. Beilstein J Org Chem 2010; 6:1120-6. [PMID: 21160916 PMCID: PMC3002078 DOI: 10.3762/bjoc.6.128] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Accepted: 11/03/2010] [Indexed: 11/23/2022] Open
Abstract
The steric and electronic influence of backbone substitution in IMes-based (IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene) N-heterocyclic carbenes (NHC) was probed by synthesizing the [RhCl(CO)₂(NHC)] series of complexes to quantify experimentally the Tolman electronic parameter (electronic) and the percent buried volume (%V(bur), steric) parameters. The corresponding ruthenium-indenylidene complexes were also synthesized and tested in benchmark metathesis transformations to establish possible correlations between reactivity and NHC electronic and steric parameters.
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541
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Lawson CPAT, Slawin AMZ, Westwood NJ. Application of the copper catalysed N-arylation of amidines in the synthesis of analogues of the chemical tool, blebbistatin. Chem Commun (Camb) 2010; 47:1057-9. [PMID: 21079840 DOI: 10.1039/c0cc03624b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A robust protocol for the CuI-catalysed arylation of amidines is presented. Whilst the initially identified conditions were useful for benzamidine-derived substrates, difficulties were encountered with more complex substrates. This problem was overcome following a change in ligand type, enabling the synthesis of analogues of the chemical tool, blebbistatin.
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542
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Smaldone RA, Forgan RS, Furukawa H, Gassensmith JJ, Slawin AMZ, Yaghi OM, Stoddart JF. Titelbild: Metal-Organic Frameworks from Edible Natural Products (Angew. Chem. 46/2010). Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201004618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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543
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Konrad TM, Fuentes JA, Slawin AMZ, Clarke ML. Highly Enantioselective Hydroxycarbonylation and Alkoxycarbonylation of Alkenes using Dipalladium Complexes as Precatalysts. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201004415] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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544
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Konrad TM, Fuentes JA, Slawin AMZ, Clarke ML. Highly Enantioselective Hydroxycarbonylation and Alkoxycarbonylation of Alkenes using Dipalladium Complexes as Precatalysts. Angew Chem Int Ed Engl 2010; 49:9197-200. [DOI: 10.1002/anie.201004415] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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545
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Spruell JM, Coskun A, Friedman DC, Forgan RS, Sarjeant AA, Trabolsi A, Fahrenbach AC, Barin G, Paxton WF, Dey SK, Olson MA, Benítez D, Tkatchouk E, Colvin MT, Carmielli R, Caldwell ST, Rosair GM, Hewage SG, Duclairoir F, Seymour JL, Slawin AMZ, Goddard WA, Wasielewski MR, Cooke G, Stoddart JF. Highly stable tetrathiafulvalene radical dimers in [3]catenanes. Nat Chem 2010; 2:870-9. [PMID: 20861904 DOI: 10.1038/nchem.749] [Citation(s) in RCA: 159] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Accepted: 06/14/2010] [Indexed: 11/09/2022]
Abstract
Two [3]catenane 'molecular flasks' have been designed to create stabilized, redox-controlled tetrathiafulvalene (TTF) dimers, enabling their spectrophotometric and structural properties to be probed in detail. The mechanically interlocked framework of the [3]catenanes creates the ideal arrangement and ultrahigh local concentration for the encircled TTF units to form stable dimers associated with their discrete oxidation states. These dimerization events represent an affinity umpolung, wherein the inversion in electronic affinity replaces the traditional TTF-bipyridinium interaction, which is over-ridden by stabilizing mixed-valence (TTF)2•+ and radical-cation (TTF•+)2 states inside the 'molecular flasks.' The experimental data, collected in the solid state as well as in solution under ambient conditions, together with supporting quantum mechanical calculations, are consistent with the formation of stabilized paramagnetic mixed-valence dimers, and then diamagnetic radical-cation dimers following subsequent one-electron oxidations of the [3]catenanes.
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546
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Hua G, Fuller AL, Slawin AMZ, Woollins JD. 1,2-Bis(2-bromo-benz-yl)diselane. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o2579. [PMID: 21587561 PMCID: PMC2983184 DOI: 10.1107/s1600536810036676] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Accepted: 09/13/2010] [Indexed: 11/10/2022]
Abstract
In the title compound, C14H12Br2Se2, the Se—Se bond length [2.3034 (9) Å] is similar to those in diphenyl diselenide [2.3066 (7) and 2.3073 (10) Å] and shorter than that in 1,8-diselenonaphthalene [2.0879 (8)Å]. The molecule adopts a classical gauche conformation.
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547
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Saha R, Das S, Banerjee A, Sahana A, Sudarsan M, Slawin AMZ, Li Y, Das D. pH dependent separation of uranium by chelation chromatography using pyridine 2,6-dimethanol as a chelator: single crystal X-ray structural confirmation of the chelated uranium complex. JOURNAL OF HAZARDOUS MATERIALS 2010; 181:154-160. [PMID: 20510512 DOI: 10.1016/j.jhazmat.2010.04.111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2010] [Revised: 04/27/2010] [Accepted: 04/27/2010] [Indexed: 05/29/2023]
Abstract
A very effective sorbent material which exhibits exceptional capture of hexavalent uranium from other actinides and lanthanides at microg g(-1) level, features pyridine 2,6-dimethanol immobilized onto alumina. The maximum sorption capacity for dioxouranium(VI) was found as 1.96 mmol g(-1) at pH 3.0. The adsorbed uranium complex was eluted completely by 0.05 mol L(-1) (NH(4))(2)CO(3) solution and the concentration of hexavalent dioxouranium ion was monitored spectrophotometrically using Arsenazo III. The structure of the chelated uranium complex has been confirmed by single crystal X-ray structure analysis and Fourier transform infrared red (FTIR) spectroscopy. Thermo gravimetric analysis/differential thermo gravimetric analysis (TGA/DTG) of the chelated uranium complex was performed. The method is reproducible with a relative standard deviation (RSD) of 1.2% (N=10) and the three sigma detection limits (N=15) 1.2 microg mL(-1) respectively. A pre-concentration factor, almost 500, for uranium was achieved. Interferences from Th(4+), Mn(2+), Ni(2+) and Cu(2+) ions were masked with ethylene diamine tetra acetic acid (di-sodium salt) (Na(2)EDTA) in the aqueous phase. The developed method has been tested for uranium recovery and estimation in some certified reference materials and environmental samples.
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548
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Douglas J, Ling KB, Concellón C, Churchill G, Slawin AMZ, Smith AD. NHC-Mediated Chlorination of Unsymmetrical Ketenes: Catalysis and Asymmetry. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000864] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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549
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Liu L, Chen ZF, Wei HB, Li Y, Fu YC, Xu H, Li JP, Slawin AMZ, Dong JX. Ionothermal Synthesis of Layered Zirconium Phosphates and Their Tribological Properties in Mineral Oil. Inorg Chem 2010; 49:8270-5. [DOI: 10.1021/ic100657a] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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550
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Woods PA, Morrill LC, Lebl T, Slawin AMZ, Bragg RA, Smith AD. Isothiourea-mediated stereoselective C-acylation of silyl ketene acetals. Org Lett 2010; 12:2660-3. [PMID: 20459078 DOI: 10.1021/ol1008747] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Isothiourea DHPB promotes the diastereoselective C-acylation of silyl ketene acetals with anhydrides or benzoyl fluoride, giving 3-acyl-3-aryl or 3-acyl-3-alkylfuranones in excellent yields and stereoselectivities (up to 99:1 dr).
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