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  1. Book: Principles of x-ray crystallography

    Ooi, Li-ling

    2010  

    Title variant X-ray crystallography
    Author's details Li-ling Ooi
    Keywords X-ray crystallography
    Language English
    Size XII, 154 S., Ill., graph. Darst.
    Publisher Oxford Univ. Press
    Publishing place Oxford u.a.
    Document type Book
    Note Literaturangaben
    ISBN 0199569045 ; 9780199569045
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  2. Article: Synthesis of 5-alkylidene-1,3-dioxane-4,6-diones, an easily accessible family of axially chiral alkenes: preparation in non-racemic form and platinum binding studies.

    Casadesus, Meritxell / Coogan, Michael P / Ooi, Li-Ling

    Organic & biomolecular chemistry

    2006  Volume 4, Issue 20, Page(s) 3822–3830

    Abstract: A general synthetic route to 5-alkylidene-1,3-dioxane-4,6-diones, which are a family of axially chiral alkenes, is described. Conformational issues are explored and the platinum-binding properties of these species are discussed. That these alkenes exist ... ...

    Abstract A general synthetic route to 5-alkylidene-1,3-dioxane-4,6-diones, which are a family of axially chiral alkenes, is described. Conformational issues are explored and the platinum-binding properties of these species are discussed. That these alkenes exist as stable enantiomers is established by their partial kinetic resolution upon reaction with cysteine.
    Language English
    Publishing date 2006-10-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 2097583-1
    ISSN 1477-0539 ; 1477-0520
    ISSN (online) 1477-0539
    ISSN 1477-0520
    DOI 10.1039/b608785j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Synthesis of unsymmetrical 3,3'-biquinazoline-2,2'-diones by condensation of 3-aminoquinazolinones with benzoxazinones; fortuitous discovery, and further syntheses of 4-H-3-oxo-1,9a,10-triazaanthracen-9-ones.

    Coogan, Michael P / Ooi, Li-ling / Pertusati, Fabrizio

    Organic & biomolecular chemistry

    2005  Volume 3, Issue 6, Page(s) 1134–1139

    Abstract: Condensation of 2-alkyl- or 2-aryl-3-aminoquinazolin-4-ones with benz[1,3]oxazin-4-ones gives the unsymmetrical 2,2' disubstituted 3,3' biquinazoline-4,4'-diones. The reaction is tolerant to a range of heteroatom and unsaturated functionality in the ... ...

    Abstract Condensation of 2-alkyl- or 2-aryl-3-aminoquinazolin-4-ones with benz[1,3]oxazin-4-ones gives the unsymmetrical 2,2' disubstituted 3,3' biquinazoline-4,4'-diones. The reaction is tolerant to a range of heteroatom and unsaturated functionality in the quinazolinone 2-position. However, treatment of 3-amino-2-hydroxymethyl-3H-quinazolin-4-ones with benz[1,3]oxazinone at high temperatures gave 4H-3-oxo-1,9a,10-triazaanthracen-9-ones, an unreported fused heterocyclic system, a more direct synthesis of which, replacing benzoxazinones with orthoesters is presented.
    Language English
    Publishing date 2005-03-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 2097583-1
    ISSN 1477-0539 ; 1477-0520
    ISSN (online) 1477-0539
    ISSN 1477-0520
    DOI 10.1039/b419108k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Platinum-mediated oxidative addition and reductive elimination of imidazolium salts at C4 and C5.

    Bacciu, Deborha / Cavell, Kingsley J / Fallis, Ian A / Ooi, Li-Ling

    Angewandte Chemie (International ed. in English)

    2005  Volume 44, Issue 33, Page(s) 5282–5284

    Language English
    Publishing date 2005-08-19
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.200500884
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Cationic terminal borylene complexes: a synthetic and mechanistic investigation of M=B metathesis chemistry.

    Kays, Deborah L / Day, Joanna K / Ooi, Li-Ling / Aldridge, Simon

    Angewandte Chemie (International ed. in English)

    2005  Volume 44, Issue 45, Page(s) 7457–7460

    Language English
    Publishing date 2005-12-01
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.200502343
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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  6. Article: Colorimetric fluoride ion sensing by polyborylated ferrocenes: structural influences on thermodynamics and kinetics.

    Day, Joanna K / Bresner, Christopher / Coombs, Natalie D / Fallis, Ian A / Ooi, Li-Ling / Aldridge, Simon

    Inorganic chemistry

    2008  Volume 47, Issue 3, Page(s) 793–804

    Abstract: The thermodynamic factors underlying the use of ferroceneboronic esters as electrochemical or colorimetric fluoride ion sensors have been investigated through the synthesis of a range of systematically related derivatives differing in the number/nature ... ...

    Abstract The thermodynamic factors underlying the use of ferroceneboronic esters as electrochemical or colorimetric fluoride ion sensors have been investigated through the synthesis of a range of systematically related derivatives differing in the number/nature of the boronic ester substituents and in the nature of ancillary ligands. Thus, if the shift in electrochemical potential associated with the conversion of one (or more) boronic ester group(s) to anionic boronate(s) on fluoride binding is sufficient to allow oxidation of the resulting host/guest complex by dioxygen, colorimetric sensing is possible. In practice, while monofunctional systems of the type CpFe[eta(5)-C(5)H(4)B(OR)(2)] offer selectivity in fluoride binding, electrochemical shifts in chloroform solution are insufficient to allow for a colorimetric response. Two chemical modification strategies have been shown to be successful in realizing a colorimetric sensor: (i) the use of the more strongly electron-donating Cp(*) ancillary ligand (which shifts the oxidation potential of both the free receptor and the resulting fluoride adduct cathodically by ca. -400 mV) and (ii) receptors featuring two or more binding sites and consequently a larger fluoride-induced electrochemical shift. Thus, in the case of [eta(5)-C(5)H(4)B(OR)(2)](2)Fe [(OR)(2) = OC(H)PhC(H)PhO, 2(s)], the binding of 2 equiv of fluoride gives an electrochemical shift (in chloroform) of -960 mV (cf. -530 mV for the corresponding monofunctional analogue, 1(s)). Related tris- and tetrakis-functionalized systems are also shown to be oxidized as the bis(fluoride) adducts, presumably because of fast oxidation kinetics, relative to the rate of the (electrostatically unfavorable) binding of a third equivalent of fluoride. Furthermore, the rate of sensor response (as measured by UV/vis spectroscopy) is found to be strongly enhanced by the presence of pendant (uncomplexed) three-coordinate boronic ester functions (e.g., a rate enhancement of 1-2 orders of magnitude for 3(s)/4(s) with respect to 2(s)) and/or delocalized aromatic substituents.
    MeSH term(s) Boron/chemistry ; Colorimetry/methods ; Electrochemistry ; Ferrous Compounds/chemistry ; Fluorides/analysis ; Kinetics ; Magnetic Resonance Spectroscopy ; Metallocenes ; Spectrometry, Mass, Electrospray Ionization ; Spectrophotometry, Infrared ; Spectrophotometry, Ultraviolet ; Thermodynamics
    Chemical Substances Ferrous Compounds ; Metallocenes ; Boron (N9E3X5056Q) ; Fluorides (Q80VPU408O) ; ferrocene (U96PKG90JQ)
    Language English
    Publishing date 2008-02-04
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1484438-2
    ISSN 1520-510X ; 0020-1669
    ISSN (online) 1520-510X
    ISSN 0020-1669
    DOI 10.1021/ic701494p
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: 1-trimethylsilylphosphirane as a ligand and as a stable masked reagent for phosphirane.

    Tallis, Huw A / Newman, Paul D / Edwards, Peter G / Ooi, Liling / Stasch, Andreas

    Dalton transactions (Cambridge, England : 2003)

    2008  , Issue 1, Page(s) 47–53

    Abstract: 1-Trimethylsilylphosphirane, C2H4PSiMe3, has been prepared on a multi gram scale from P(SiMe3)3 via CICH2CH2P(SiMe3)2. C2H4PSiMe3 is readily susceptible to protonolysis forming the thermally unstable parent phosphirane, C2H4PH, in good yields. Reaction ... ...

    Abstract 1-Trimethylsilylphosphirane, C2H4PSiMe3, has been prepared on a multi gram scale from P(SiMe3)3 via CICH2CH2P(SiMe3)2. C2H4PSiMe3 is readily susceptible to protonolysis forming the thermally unstable parent phosphirane, C2H4PH, in good yields. Reaction of C2H4PSiMe3 with fac-M(CO)3(CH3CN)3 (M = Cr, Mo) or [Fe(eta5-C5H5)(eta6-C6H6)](PF6) give rise tofac-M(CO)3(C2H4PSiMe3)3 and [Fe(eta5-C5H5)(C2H4PSiMe3)3](PF6) respectively. Protonolysis of the free or coordinated 1-trimethylsilylphosphirane readily causes P-Si cleavage to give rise to the parent C2H4PH or the respective complexes,fac-M(CO)3(C2H4PH)3 andfac-[Fe(eta5-C5H5)(C2H4PH)3](PF6) in situ. All new complexes are characterised by analytical and spectroscopic methods and the X-ray crystal structures of fac-Cr(CO)3(C2H4PSiMe3)3 and fac-Mo(CO)3(C2H4PH)3 have also been determined.
    Language English
    Publishing date 2008-03-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1364-5447 ; 1477-9234 ; 1477-9226 ; 0300-9246
    ISSN (online) 1364-5447 ; 1477-9234
    ISSN 1477-9226 ; 0300-9246
    DOI 10.1039/b715327a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Synthesis and characterisation of benzyl phosphino-thioether and -thiolato Pd(II) complexes and their applications in Suzuki coupling reactions.

    Dervisi, Athanasia / Koursarou, Despina / Ooi, Li-Ling / Horton, Peter N / Hursthouse, Michael B

    Dalton transactions (Cambridge, England : 2003)

    2006  , Issue 48, Page(s) 5717–5724

    Abstract: The synthesis of the benzyl phosphinothioether derivatives Ph(2)PCH(2)CH(Et)SR and their corresponding palladium complexes are reported, where R = CH(2)Ph, R = CH(2)-3,5-Me-C(6)H(3) and R = 1-CH(2)C(10)H(7)(5). Crystallographic data obtained for the ... ...

    Abstract The synthesis of the benzyl phosphinothioether derivatives Ph(2)PCH(2)CH(Et)SR and their corresponding palladium complexes are reported, where R = CH(2)Ph, R = CH(2)-3,5-Me-C(6)H(3) and R = 1-CH(2)C(10)H(7)(5). Crystallographic data obtained for the complexes Pd(3)Cl(2) and Pd(4)Cl(2) show intra- and inter-molecular pi-pi interactions between the aromatic rings on the P and S substituents, and NOE experiments for Pd(4)Cl(2) show that these interactions persist in solution. The performance of the phosphinothioether palladium complexes in aryl-aryl cross-coupling reactions is compared with that of the corresponding complex of the parent phosphinothiolato ligand Ph(2)PCH(2)CH(Et)S(-)(1). High turnover numbers up to 2000000 are reported for the coupling of bromobenzene, using the palladium dimer [Pd(1)I](2) as the catalyst precursor. Kinetic studies show a linear dependence of the reaction on catalyst loading. The effect of other variables on the cross-coupling reaction, such as temperature, solvent and base, is also reported.
    Language English
    Publishing date 2006-12-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1364-5447 ; 1477-9234 ; 1477-9226 ; 0300-9246
    ISSN (online) 1364-5447 ; 1477-9234
    ISSN 1477-9226 ; 0300-9246
    DOI 10.1039/b609607g
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Iron complexes of facially capping triphosphorus macrocycles.

    Edwards, Peter G / Malik, K M Abdul / Ooi, Li-ling / Price, Andrew J

    Dalton transactions (Cambridge, England : 2003)

    2006  , Issue 3, Page(s) 433–441

    Abstract: Primary and secondary phosphine piano-stool complexes of the type [eta(5)-CpFeL3]+ (L = phenylphosphine, 3, (alpha-methyl)vinylphosphine, 4, allylphosphine, 5, (2-methylpropenyl)phosphine, 5b, allyl(phenyl)phosphine, 6) are described. The alkenyl ... ...

    Abstract Primary and secondary phosphine piano-stool complexes of the type [eta(5)-CpFeL3]+ (L = phenylphosphine, 3, (alpha-methyl)vinylphosphine, 4, allylphosphine, 5, (2-methylpropenyl)phosphine, 5b, allyl(phenyl)phosphine, 6) are described. The alkenyl phosphine complexes, 5 and 6, react by intramolecular hydrophosphination to give the corresponding [eta(5)-CpFe]+ complexes of 1,5,9-triphosphacyclododecane (12-aneP3R3, 2, R = H), 9 and 10 respectively. Alkylation of the secondary phosphines in 9 is achieved by hydrophosphinations with ethene to give the 12-aneP3R3 (R = Et) derivative 11. These complexes are also obtained by reaction of suitable [eta(5)-CpFe]+ containing precursor complexes with the corresponding free 12-aneP3R3 macrocycle as is the related [eta(5)-Cp*Fe]+ derivative, 8. Direct substitution of acetonitrile in [Fe(CH3CN)6][BF4]2 by 12-aneP3Et3, leads to the macrocycle piano-stool complex, [(12-aneP3Et3)Fe(CH3CN)3][BF4]2, 7. The crystal structures of selected primary phosphine, eta(5)-Cp, eta(5)-Cp* complexes and 7, allow a comparison of steric influences upon key macrocycle ring closure reactions and hence an insight into parameters required for the formation of smaller ring sizes by template based methods.
    Language English
    Publishing date 2006-01-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1364-5447 ; 1477-9234 ; 1477-9226 ; 0300-9246
    ISSN (online) 1364-5447 ; 1477-9234
    ISSN 1477-9226 ; 0300-9246
    DOI 10.1039/b509627h
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Synthetic and reaction chemistry of heteroatom stabilized boryl and cationic borylene complexes.

    Kays Née Coombs, Deborah L / Rossin, Andrea / Day, Joanne K / Ooi, Li-Ling / Aldridge, Simon

    Dalton transactions (Cambridge, England : 2003)

    2006  , Issue 2, Page(s) 399–410

    Abstract: The synthesis, spectroscopic and structural characterization of the aryloxy and amino functionalized chloroboryl complexes (eta(5)-C(5)R(5))Fe(CO)(2)B(OMes)Cl (R = H, 2a ... R = Me, 3a) and (eta(5)-C(5)H(5))Fe(CO)(2)B(N(i)Pr(2))Cl (7a) are reported. ... ...

    Abstract The synthesis, spectroscopic and structural characterization of the aryloxy and amino functionalized chloroboryl complexes (eta(5)-C(5)R(5))Fe(CO)(2)B(OMes)Cl (R = H, 2a

    R = Me, 3a) and (eta(5)-C(5)H(5))Fe(CO)(2)B(N(i)Pr(2))Cl (7a) are reported. Compound 2ais shown to be a versatile substrate for further boron-centred substitution chemistry leading to the asymmetric boryl complexes (eta(5)-C(5)H(5))Fe(CO)(2)B(OMes)ER(n) [ER(n) = OC(6)H(4)(t)Bu-4, 2c; ER(n) = SPh, 2d] with retention of the metal-boron bond. The reactivities of 2a, 3a and 7a towards the halide abstraction agent Na[BAr(f)(4)] have also been examined, in order to investigate the potential for the generation of cationic heteroatom-stabilized terminal borylene complexes. The application of this methodology to the mesityloxy derivatives and gives rise to B-F containing products, presumably via fluoride abstraction from the [BAr(f)(4)](-) counter-ion. By contrast, amino-functionalized complex 7a is more amenable to this approach, and the thermally robust terminal aminoborylene complex [(eta(5)-C(5)H(5))Fe(CO)(2)B(N(i)Pr(2))][BAr(f)(4)] (9) can be isolated in ca. 50% yield. The reactivity of 9towards a range of nucleophilic and/or unsaturated reagents has been examined, with examples of addition, protonolysis and metathesis chemistries having been established.
    Language English
    Publishing date 2006-01-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1364-5447 ; 1477-9234 ; 1477-9226 ; 0300-9246
    ISSN (online) 1364-5447 ; 1477-9234
    ISSN 1477-9226 ; 0300-9246
    DOI 10.1039/b512275a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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