Zobrazeno 1 - 10 of 174 pro vyhledávání: '"Oliver W. Howarth"'
1
Aquatidial, a new bis-Norsesquiterpenoid from Pachira aquatica Aubl
Autor: Luiz C. A. Barbosa, Oliver W. Howarth, Marcelo E. Rocha, Vanderlúcia Fonseca de Paula
Publikováno v: Journal of the Brazilian Chemical Society v.17 n.7 2006
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Journal of the Brazilian Chemical Society, Volume: 17, Issue: 7, Pages: 1443-1446, Published: DEC 2006
Aquatidial, a new asymmetric bis-norsesquiterpenoid, hypothetically derived from isohemigossypolone, was isolated from the outer bark of Pachira aquatica (Bombacaceae) roots, along with the known compounds isohemigossypolone, triacontyl p-coumarate a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::922046c54ff001b884faf9738bd577e7
https://doi.org/10.1590/s0103-50532006000700037
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2
Palladium catalyzed oxidation of monoterpenes: NMR study of palladium(II)–monoterpene interactions
Autor: Dorila Piló-Veloso, José Ailton Gonçalves, Elena V. Gusevskaya, Márcio José da Silva, Oliver W. Howarth
Publikováno v: Journal of Organometallic Chemistry. 690:2996-3003
Reactions of the monoterpenes β-pinene, limonene and myrcene with Pd(II) complexes in acetic acid solutions were studied by 1 H NMR spectroscopy. Various π-allyl palladium complexes were detected in situ and their interaction with CuCl 2 has been i
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bbce07e21617b16948938e3b7596bff6
https://doi.org/10.1016/j.jorganchem.2005.03.026
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3
17O NMR study of aqueous peroxoisopolymolybdate equilibria at lower peroxide/Mo ratiosElectronic supplementary information (ESI) available: concentrations of total Mo, total H2O2 and other species expressed as [Mo]. See http://www.rsc.org/suppdata/dt/b2/b206396b
Autor: Ingegärd Andersson, Oliver W. Howarth, Imre Tóth, Lage Pettersson, Masato Hashimoto, Fabian Taube
Publikováno v: Dalton Transactions. :146-152
Aqueous peroxomolybdates have been studied using 17O NMR together with equilibrium measurements and calculations, over a wide range of conditions. Ten peroxo species are identified, mostly in more than one state of protonation. Some are already known
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::31cab151012b0185da23501425a6a7c5
https://doi.org/10.1039/b206396b
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4
Equilibria and dynamics of some aqueous peroxomolybdate catalysts: a 17O NMR spectroscopic study
Autor: Lage Pettersson, Ingegärd Andersson, Imre Tóth, Andrea Bodor, Fabian Taube, Oliver W. Howarth
Publikováno v: Journal of the Chemical Society, Dalton Transactions. :4451-4456
The equilibrium speciation at 278 K and the dynamics in the systems pH++qMoO42–+rH2O2+sL (H+)p(MoO42–)q(H2O2)r Ls(L = SO42– or Cl–) in 0.3 M Na2(SO4) and 0.6 M Na(Cl) medium has been determined fro ...
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::261a91a8d7b1d31a0fa7d6418ab7800f
https://doi.org/10.1039/b206230e
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5
Palladium catalyzed oxidation of monoterpenes: novel oxidation of myrcene with dioxygen
Autor: José Ailton Gonçalves, Oliver W. Howarth, Elena V. Gusevskaya
Publikováno v: Journal of Molecular Catalysis A: Chemical. 185:97-104
Myrcene can be efficiently and selectively oxidized by dioxygen in glacial acetic acid containing LiCl, in the presence of the PdCl2–CuCl2 catalytic combination, yielding two isomers of a new functionalized monoterpene, i.e., 3-(1-acetoxy-1-methyle
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::adabaf79217e1af9affb12ad5f07a9ca
https://doi.org/10.1016/s1381-1169(02)00061-4
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6
Measuring stereoselectivity in lipase-catalyzed acidolysis reactions by ultra-high resolution13C nuclear magnetic resonance
Autor: Oliver W. Howarth, David H. G. Crout, Ian C. Chandler
Publikováno v: Journal of the American Oil Chemists' Society. 78:953-958
Elucidating the stereoselectivity of lipases in synthetic reactions of triacylglycerols has hitherto been carried out using traditional analytical techniques to determine the composition of the reaction products. These methods are laborious and are n
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https://doi.org/10.1007/s11746-001-0370-4
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7
Speciation in vanadium bioinorganic systems
Autor: Ingegärd Andersson, Oliver W. Howarth, Lage Pettersson, Sarah Angus-Dunne
Publikováno v: Journal of Inorganic Biochemistry. 80:51-58
Using a combination of potentiometry (glass electrode) and quantitative 51V NMR spectroscopy, the full speciation in the vanadate–peroxide and vanadate–peroxide–imidazole systems was determined in the pH range 1–10 (0.150 M Na(Cl) medium, 25
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https://doi.org/10.1016/s0162-0134(00)00039-8
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8
Encapsulated Tl(III) strongly retained within an iminophenolate cryptand host
Autor: Oliver W. Howarth, Jane Nelson, Noreen Martin, Grace G. Morgan, Michael G. B. Drew
Publikováno v: Journal of the Chemical Society, Dalton Transactions. :1275-1278
The crystal structure of a thallium(III) iminophenolate cryptate is reported. Tl(III) is strongly held within the host, as judged by NMR indicators of strength of binding, by both imino-N, (via203,205Tl,15N coupling of over 1000 Hz in the MAS-CP spec
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::454fc18230ef478310a48d34774562f8
https://doi.org/10.1039/b000736f
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9
Conformational choice in disilver cryptates; an 1H NMR and structural study
Autor: Vickie McKee, Oliver W. Howarth, Grace G. Morgan, Jane Nelson
Publikováno v: Journal of the Chemical Society, Dalton Transactions. :2097-2102
Disilver complexes of three iminocryptands, with either tris(aminopropylamine)- or tris(aminoethylamine)-derived caps {N[(CH2)nNCHRCHN(CH2)n]3N (n = 2 or 3, R = 1,3-(CH2)2C6H4 or 2,5-(CH2)2C4H4O)} have been structurally characterised, and show relati
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https://doi.org/10.1039/a901041f
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10
Aqueous co-ordination chemistry using electrospray mass spectrometry of anions: metal(VI)–monosaccharide complexes (M = W or Mo)
Autor: Keith R. Jennings, Tereza Fernandez, Michael J. Deery, Oliver W. Howarth
Publikováno v: Journal of the Chemical Society, Dalton Transactions. :2177-2184
Electrospray mass spectrometry has been applied for the first time to the co-ordination chemistry of aqueous anions, using as a model system the reaction of tungstate or molybdate with galactaric (mucic) acid and galacturonic acid; 1∶1, 2∶1 and 1
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https://doi.org/10.1039/a801944d
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