Výsledky vyhledávání - "Othmar Stelzer"

Synthesis of Binol-based diphosphinites bearing chiral phospholane units and their application in asymmetric catalysis

Autor: Walter Leitner, Stefan Schenk, Othmar Stelzer, Laurent Weisgerber, Tim Hammerer, Ulli Englert, Giancarlo Franciò

Publikováno v: Tetrahedron: Asymmetry. 23:53-59

New diphosphinite ligands based on atropoisomeric diol backbones and (R,R)-2,5-dimethylphospholane moieties have been prepared and fully characterised. For each ligand structure, both diastereomers have been synthesised. These ligands are available t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::eb2663a4a19b23db2e8bcffdd47cb151
https://doi.org/10.1016/j.tetasy.2011.12.011

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Optically Active Phospholanes as Substituents on Ferrocene and Chromium‐Arene Complexes

Autor: Albrecht Salzer, Othmar Stelzer, Jürgen Haberland, Wolfgang Braun, Andreas Liese, Werner Hummel, Thomas Nickel, Beatrice Calmuschi

Publikováno v: European Journal of Inorganic Chemistry. 2004:2235-2243

An improved synthesis of (R,R)- and (S,S)-hexane-2,5-diol is presented. The (S,S)-derivative was converted into a cyclic sulfate, which on treatment with NaPH2 in liquid ammonia ultimately gave the secondary (R,R)-2,5-dimethylphospholane. This phosph

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c9cce7c559234137918e38543ed00cb8
https://doi.org/10.1002/ejic.200300685

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Novel P,N Ligands Derived from ( R )‐ and ( S )‐1‐Phenylethylamine with (2 R ,5 R )‐2,5‐Dimethylphospholanyl Groups (DuPHAMIN) for Asymmetric Catalysis

Autor: Stefan Roßenbach, David J. Brauer, Othmar Stelzer, Konstantin W. Kottsieper

Publikováno v: European Journal of Inorganic Chemistry. 2003:1748-1755

Novel P,N chelating ligands with three stereogenic centres in positions α to the donor atoms have been prepared in good yields and high enantiomeric purity by a series of reactions beginning with either (R)- or (S)-1-phenylethylamine. These isomers

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::297a790afb180f7cd97822f9d180372f
https://doi.org/10.1002/ejic.200200388

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Water-Soluble Phosphines. 17.1 Novel Water-Soluble Secondary and Tertiary Phosphines with Disulfonated 1,1‘-Biphenyl Backbones and Dibenzophosphole Moieties

Autor: Dietmar Hoff, Kirsten Wenz, Konstantin W. Kottsieper, Christian Liek, William S. Sheldrick, Othmar Stelzer, Oliver Herd

Publikováno v: Inorganic Chemistry. 41:5034-5042

Reaction of 2,2'-difluoro-1,1'-biphenyl with chlorosulfonic acid and subsequent hydrolysis followed by neutralization with potassium or sodium hydroxide affords disodium or dipotassium 5,5'-disulfonato-2,2'-difluoro-1,1'-biphenyl (1a, 1b). On treatme

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a420db272919dc76bb919b47ad633f47
https://doi.org/10.1021/ic011239z

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Water soluble phosphines

Autor: Konstantin W. Kottsieper, Thomas Nickel, Martin Hingst, William S. Sheldrick, Michael Tepper, David J. Brauer, Christian Liek, Othmar Stelzer

Publikováno v: Journal of Organometallic Chemistry. 645:14-26

Phosphine ligands containing mono- and multiply substituted aromatic substituents (1–13, 19a and 19b) are accessible in high yields by palladium-catalyzed PC coupling reactions between primary, secondary or disecondary phosphines and iodo- or br

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::12ab14426fc753d2dfc53c43a89d2adc
https://doi.org/10.1016/s0022-328x(01)01371-7

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1-Vinylimidazole – a versatile building block for the synthesis of cationic phosphines useful in ionic liquid biphasic catalysis

Autor: Peter Wasserscheid, Konstantin W. Kottsieper, Othmar Stelzer

Publikováno v: Journal of Molecular Catalysis A: Chemical. 175:285-288

Base catalyzed addition of 1-vinylimidazole to primary and secondary phosphines affords tertiary phosphines with terminal 1-imidazolyl substituents C3H3N2 in high yields. The X-ray structure of the oxide Ph2P(O)–(CH2)2–1-C3H3N2 has been determine

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ebfa6abb3ebae8a8681ddb79221f177f
https://doi.org/10.1016/s1381-1169(01)00207-2

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Chiral Phosphine Ligands from Amino Acids. II. A Facile Synthesis of Phosphinoserines by Nucleophilic Phosphination Reactions - X-Ray Structure Analyses of Ar2P-CH2-CH(NHBOC)(COOMe) (Ar = Ph,m-xylyl)

Autor: David J. Brauer, Stefan Schenk, Konstantin W. Kottsieper, Othmar Stelzer

Publikováno v: Zeitschrift für anorganische und allgemeine Chemie. 627:1151-1156

Phosphino derivatives of serine R2P–CH2–CH(NHBOC)(COOMe) (2 a–2 d) have been obtained in high yield by nucleophilic phosphination of N-(tert.butoxycarbonyl)-3-iodo-L-alanine methylester with secondary phosphines R2PH (R = Ph, 2-tolyl, 3,5-xylyl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::85d4f1942db9ab5424313070ffb88636
https://doi.org/10.1002/1521-3749(200106)627:6<1151::aid-zaac1151>3.0.co

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