Výsledky vyhledávání - "James A. S. Howell"

New furoquinoline alkaloid and flavanone glycoside derivatives from the leaves ofOricia suaveolens and Oricia renieri(Rutaceae)

Autor: Jean Duplex Wansi, James A. S. Howell, Judith Caroline Ngo Nyobe, Luc Mbaze Meva’a, Jean Claude Ndom, Achille Nouga, Alain Njoya, Phillipa B. Cranwell, Laurence M. Harwood, Emmanuel Mpondo Mpondo

Publikováno v: Natural Product Research. 30:305-310

Fractionation of the methanol extract of the leaves of Oricia renieri and Oricia suaveolens (Rutaceae) led to the isolation of 13 compounds including the hitherto unknown furoquinoline alkaloid named 6,7-methylenedioxy-5-hydroxy-8-methoxy-dictamnine

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::849c48273eff9b557f501d668f2c747a
https://doi.org/10.1080/14786419.2015.1057727

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DFT investigation of the interaction between gold(I) complexes and the active site of thioredoxin reductase

Autor: James A. S. Howell

Publikováno v: Journal of Organometallic Chemistry. 694:868-873

The binding of the [ Au ( PMe 3 ) ] + fragment to cysteine, selenocysteine and the tetrapeptides H2NGlyCysAGlyCOOH (A = Cys, Sec) has been investigated by DFT methods as a model for the binding of gold(I) to the selenium-containing active site of thi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0050441fdfa9b7db8b352072315e6ea9
https://doi.org/10.1016/j.jorganchem.2008.10.029

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Gold(i)–isocyanide and gold(i)–carbene complexes as substrates for the laser decoration of gold onto ceramic surfaces

Autor: Lisa S. Cobden, Robert Heathcote, Nicola Jennings, David Cartlidge, James A. S. Howell, Michael B. Hursthouse, Simon J. Coles

Publikováno v: Dalton Trans.. :1309-1315

Gold-isocyanide complexes XAu(RNC) (X = halide, pseudohalide, R = alkyl, aryl) and water soluble gold-carbene complexes XAuC(NHPh)[MeN(CH(2)CH(2)O)(n)Me] (X = Cl, n = 1-11) have been prepared and evaluated as substrates for the direct laser writing o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::774ee30e914110c9f628401bd1fae5d7
https://doi.org/10.1039/b617347k

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Molecular Mechanics Analysis of Structure and Diastereoselectivity toward Lithiation in Amido- and α-Aminoferrocene Complexes

Autor: James A. S. Howell, Paul C. Yates, Natalie Fey, Patrick McArdle, Desmond Cunningham, Simon Parsons, David W. H. Rankin

Publikováno v: Organometallics. 21:5272-5286

A molecular mechanics force field has been developed for the conformational analysis of amido- and α-aminoferrocenes. Parameterization for ring-substituent rotational barriers in amidoferrocenes and other cross-conjugated derivatives have been calcu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d2621294fea03f3312f66cb85151672d
https://doi.org/10.1021/om020556q

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Conformational Properties of Substituted Ferrocenes: Experimental and Theoretical Studies of the Molecular Structures of 1,1‘-Di-tert-butylferrocene and Isopropylferrocene

Autor: Carole A. Morrison, Stewart Fraser, Robert A. Coxall, James A. S. Howell, Heather E. Robertson, Simon Parsons, Simon F. Bone, David W. H. Rankin, Paul C. Yates, Natalie Fey

Publikováno v: Organometallics. 20:2309-2320

The molecular structures of 1,1‘-di-tert-butylferrocene (1) and isopropylferrocene (2) have been examined by solid-state X-ray crystallography, gas-phase electron diffraction, and DFT and molecular...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2de8ffbc54ae6c076c225fe78d833aea
https://doi.org/10.1021/om001012w

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Effect of fluorine and trifluoromethyl substitution on the donor properties and stereodynamical behaviour of triarylphosphines

Autor: James A. S. Howell, Desmond Cunningham, Michael B. Hursthouse, Patrick McArdle, Natalie Fey, Einat Sadeh, Zeev Goldschmidt, Paul C. Yates, Jonathan D. Lovatt, Hugo E. Gottlieb, Mark E. Light

Publikováno v: Journal of the Chemical Society, Dalton Transactions. :3015-3028

A series of 2-, 3- or 4-trifluoromethyl substituted triarylphosphines and their oxide, chalcogenide and Fe(CO)4 derivatives have been prepared and characterised spectroscopically and crystallographically. Electronic effects of CF3 substitution are cu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b63c22daa1342027ce49c063f94b8b07
https://doi.org/10.1039/a903211h

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Lipase catalysed resolution of ferrocene cyanohydrin: access to novel ferrocenyl aminoalcohols and diamines

Autor: Desmond Cunningham, Martin A. Walsh, Patrick McArdle, James A. S. Howell, Angela Patti, Giovanni Nicolosi, Kristina Humphries

Publikováno v: Tetrahedron: Asymmetry. 8:1027-1030

(R)-(+)-Ferrocene cyanohydrin acetate, obtained by enzymatic acylation of ferrocene cyanohydrin, may be transformed by reduction and alkylation into novel ferrocenyl β-aminoalcohols. Substitution of acetate by methanolic HNMe2 proceeds with racemisa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e08da745e04fa798725424d7d066fad1
https://doi.org/10.1016/s0957-4166(97)00092-x

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Stereoelectronic effects on arene rotation: the structure and fluxionality of [1,4-C6H4(SiMe3)2]Cr(CO)2PPh3 and [1,3,5-C6H3tBu3)Cr(CO)2PPh3

Autor: Claire J. Beddows, Hugo E. Gottlieb, Desmond Cunningham, Patrick McArdle, Paul C. Yates, Paula J. O'Leary, James A. S. Howell

Publikováno v: Journal of Organometallic Chemistry. 527:21-27

Barriers to metal-arene ring rotation in [1,4-C6H4(SiMe3)2)Cr(CO)2PPh3 and (1,3,5-C6H3tBu2)Cr(CO)2PPh3 are lowered relative to a previously reported barrier of 32 J mol−1 for (1,4-C6H4tBu2)Cr(CO)2PPh3. Reasons for the decreased barriers are discuss

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9b54ba016daa51e480bba04edfa677e8
https://doi.org/10.1016/s0022-328x(96)06537-0

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Synthesis and Reactivity of Cyclic and Acyclic (1-(acyloxy)pentadienyl)Fe(CO)2LX and (1-alkoxypentadienyl)Fe(CO)2LX Salts (L = CO, PPh3)

Autor: Paula J. O'Leary, Michelle Hastings, Philip W. Howard, Patrick McArdle and, James A. S. Howell, Desmond Cunningham, and David A. Owen, and Andrew G. Bell, Andrew J. Whitehead, G. Richard Stephenson

Publikováno v: Organometallics. 15:4247-4257

A variety of cyclic and acyclic [(pentadienyl)Fe(CO)2L]X complexes (L = CO, PPh3) containing terminal acyloxy or alkoxy substituents have been prepared. In situ NMR studies indicate that for the acyclic series where L = CO, stability is limited by so

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b26314a6641919778c7f855afca6b601
https://doi.org/10.1021/om960336a

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Enzymatic generation of planar chirality in the (arene)Cr(CO)3 series: experimental results and modelling studies

Autor: Gérard Jaouen, Margaret O'Gara, Bernard Malézieux, Jacques Salaün, Patrick McArdle, Michael G. Palin, James A. S. Howell, Siden Top, Desmond Cunningham, Jean Michel Cense

Publikováno v: Tetrahedron: Asymmetry. 7:95-104

Hydrolysis using pig liver esterase of (benzene-1,2-diacetic ester)Cr(CO) 3 complexes generates the half-ester in high enantiomeric purity. The high enantioselectivity may be rationalised through substrate interaction with the Jones active site model

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::82bc585861f67eaf10348b14841407b3
https://doi.org/10.1016/0957-4166(95)00425-4

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