Výsledky vyhledávání - "Urs D. Lengweiler"

Proof for a nonproteinaceous calcium-selective channel in Escherichia coli by total synthesis from ( R )-3-hydroxybutanoic acid and inorganic polyphosphate

Autor: Dieter Seebach, Urs D. Lengweiler, Rosetta N. Reusch, Sudipto Das

Publikováno v: Proceedings of the National Academy of Sciences. 94:9075-9079

Traditionally, the structure and properties of natural products have been determined by total synthesis and comparison with authentic samples. We have now applied this procedure to the first nonproteinaceous ion channel, isolated from bacterial plasm

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::36e6fe457fcbd4f6aad57330b7f7b6d2
https://doi.org/10.1073/pnas.94.17.9075

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Synthesis of Monodisperse Macromolecular Bicyclic and dendritic compounds from (R)-3-hydroxybutanoic acid and benzene-1,3,5-tricarboxylic acid and analysis by fragmenting MALDI-TOF mass spectroscopy

Autor: Guido F. Herrmann, Walter Amrein, Dieter Seebach, Urs D. Lengweiler

Publikováno v: Helvetica Chimica Acta. 80:989-1026

As previously shown, oligo- and poly(β-hydroxyalkanoates) have a high tendency to form lamellar crystallites with ca. 50-A thickness which corresponds to chain lengths of 16 units (Fig. 1). To have monodisperse model compounds, we have now prepared

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4c3c4d4049ae46ba9a589efbe76e5c4d
https://doi.org/10.1002/hlca.19970800402

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Synthese monodisperser linearer und cyclischer Oligomere der (R)-3-Hydroxybuttersäure mit bis zu 128 Einheiten

Autor: Dieter Seebach, Urs D. Lengweiler, Monica G. Fritz

Publikováno v: Helvetica Chimica Acta. 79:670-701

Monodisperse Linear and Cyclic Oligo[(R)-3-hydroxybutanoates] Containing up to 128 Monomeric Units Using benzyl ester/(tert-butyl)diphenylsilyl ether protection, (COCl)2/pyridine esterification conditions, and a fragment-coupling strategy (with H2/Pd

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::689d26bd5cde92ab06fa6ab43644c9a2
https://doi.org/10.1002/hlca.19960790311

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Direct imaging of the surfaces of poly(β) hydroxybutyrate and hydroxybutyrate oligomers by atomic force microscopy

Autor: Kathy Sykes, Hans-Martin Müller, Terence J McMaster, Dieter Seebach, Phil Barker, Peter J. Barham, Mervyn J Miles, Urs D. Lengweiler

Publikováno v: Journal of Materials Science. 30:623-627

Attempts have been made to image the fold surface of a single crystal of polyhydroxybutyrate (PHB) using the relatively new technique of atomic force microscopy (AFM). To overcome the obscuring of the fold surface by loose loops of polymer and chain

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5727b8086101a886d404556c502a6acf
https://doi.org/10.1007/bf00356320

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Preparation and Structure of Oligolides from (R)-3-Hydroxypentanoic Acid and comparison with the hydroxybutanoic-acid derivatives: A small change with large consequences

Autor: Torsten Hoffmann, Urs D. Lengweiler, Florian N. M. Kühnle, Dieter Seebach

Publikováno v: Helvetica Chimica Acta. 77:2007-2034

Cyclic oligomers of (R)-3-hydroxyvaleric acid (3-HV) are prepared from the monomer by three different methods, giving various ratios of the oligomers. The macrocycles containing three to twelve 3-HV units (12- to 48-membered rings) are isolated in pu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bf2e0e2f00936f92cb57d77acccaa814
https://doi.org/10.1002/hlca.19940770727

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Synthesis of Linear Oligomers of (R)-3-Hydroxybutyrate and Solid-State Structural Investigations by electron microscopy and X-ray scattering

Autor: Hans-Martin Müller, Urs D. Lengweiler, Peter J. Barham, Phil Barker, Albert K. Beck, H. Michael Bürger, Dieter Seebach, Kathy Sykes

Publikováno v: Helvetica Chimica Acta. 77:1099-1123

Repetitive treatment of the biopolymer P(3-HB) (molecular weight > 105 Dalton, storage or s-P(3-HB)), with lithium hexamethyl disilazanid (LHMDS) at −70° in THF leads to a mixture of oligomers with increasingly sharp distribution around a 15-, 30-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::51802ed257d0e6afa95f51431f568ebb
https://doi.org/10.1002/hlca.19940770423

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ChemInform Abstract: Synthesis of Monodisperse Macromolecular Bicyclic and Dendritic Compounds from (R)-3-Hydroxybutanoic Acid and Benzene-1,3,5- tricarboxylic Acid and Analysis by Fragmenting MALDI-TOF Mass Spectroscopy

Autor: Guido F. Herrmann, Dieter Seebach, Walter Amrein, Urs D. Lengweiler

Publikováno v: ChemInform. 28

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3f2a2207871ba07bd80d11f011adf2a9
https://doi.org/10.1002/chin.199737118

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α,α,α′,α′-Tetraaryl-1,3-dioxolane-4,5-dimethanols (TADDOLs) for Resolutions of Alcohols and as Chiral Solvating Agents in NMR Spectroscopy

Autor: Albert K. Beck, Dieter Seebach, Urs D. Lengweiler, Christoph von dem Bussche-Hünnefeld

Publikováno v: Helvetica Chimica Acta. 75:438-441

The use of α,α,α′,α′ -tetraaryl-1,3-dioxolane-4,5-dimethanols ( = TADDOLs;1) as chiral NMR shift reagents (1H, 13C, 19F) is described. In many cases, the ratio of enantiomeric alcohols and amines can be determined under standard conditions of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4b0070212cafb9468a140261518bc344
https://doi.org/10.1002/hlca.19920750203

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