Zobrazeno 1 - 10 of 351 pro vyhledávání: '"Roland Köster"'
2
Determination of the hydride concentration in alkyldiboranes(6) by 11 B NMR spectroscopy - Reduction of inorganic selenium and tellurium compounds
Autor: Bernd Wrackmeyer, Hans-Joerg Schanz, Roland Köster, Wilhelm Schüßler
Publikováno v: Fresenius' Journal of Analytical Chemistry. 362:378-381
As an alternative to volumetric analysis, 11B NMR spectroscopy can be used to determine the hydride concentration and the relative amount of different active hydride species in mixtures of alkyldiboranes(6) (alkyl = Et, Pr). Inorganic selenium(IV) co
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c309b61da7fa9cbd3ef2f7e9a77a7fdd
https://doi.org/10.1007/s002160051088
Zobrazit plný text záznamu
3
1,1 -Organoboration of mono-1-alkynyltin compounds using dialkyl(N-azolyl) boranes-stepwise ring enlargement of boron heterocycles
Autor: Wolfgang Milius, Bernd Wrackmeyer, Roland Köster, Bernd Schwarze, Heidi E. Maisel
Publikováno v: Journal of Organometallic Chemistry. 541:97-107
Mono-1-alkynyltin compounds 1–4 (Me3Sn-C ≡ CR1; R1 = H (1), Me (2), Ph (3), SnMe3 (4)) react with various dialkyl(N-azolyl)boranes 5–9 (azolyl = pyrrolyl (a), 2,5-dimethylpyrrolyl (b), indolyl (c), carbazolyl (d)) stereospecifically by 1,1-orga
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2db47b20b5cbcd84582054d4685ed508
https://doi.org/10.1016/s0022-328x(97)00019-3
Zobrazit plný text záznamu
5
2,5-dihydro-1,2,5-azasilaborole derivatives studied by15N and29Si NMR using Hahn-echo and pseudo-BIRD experiments
Autor: Bernd Wrackmeyer, Ēriks Kupče, Günter Seidel, Roland Köster
Publikováno v: Magnetic Resonance in Chemistry. 33:812-816
15N and 29Si NMR data of 2,5-hydro-1,2,5-azasilaborole derivatives and related compounds were determined with emphasis on coupling constants 1J(29Si 15N) which cannot be measured from 15N NMR spectra of most boron-nitrogen compounds. In the case of c
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::28b5e74fcd31a7e4a5bd86f2e742ce31
https://doi.org/10.1002/mrc.1260331008
Zobrazit plný text záznamu
6
Determination of signs of coupling constants [1J(77Se29Si),2J(77Se13C),3J(77Se1H)] in 2,5-dihydro-1,2,5-selenasilaborole derivatives
Autor: Bernd Wrackmeyer, Günter Seidel, Roland Köster
Publikováno v: Magnetic Resonance in Chemistry. 33:493-496
The signs of coupling constants [1J(77Se29Si) > 0, 2J(77Se13CSiMe) > 0,3J(77Se1HSiMe) > 0] were determined for pentaorgano-substituted 2,5-dihydro-1,2,5-selenasilaboroles [R3 = Me, la; R3 = C(Me)CH2, 1b], and also for derivatives in which the surroun
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::379562346cf1d7227bedf121f4971279
https://doi.org/10.1002/mrc.1260330615
Zobrazit plný text záznamu
7
Organosubstituierte 1,6,2,5-Azoniathiasilaboratabicyclo[3.3.0]oct-3-ene - Herstellung und Kristallstruktur / Organosubstituted 1,6,2,5-A zoniathiasilaboratabicyclo[3.3.0]oct-3-enes - Preparation and Crystal Structure
Autor: Roland Köster, Bernd Wrackmeyer, Günter Seidel, Roland Boese
Publikováno v: Zeitschrift für Naturforschung B. 50:959-968
The heterocycles Et [R3 = Me: A; R3 = C(Me)=CH2: B] react with 2-aminoethanethiol (1) by elimination of MeNH2 to give the monocyclic [R = Me: 3a; R = C(Me)=CH2: 3b] and the thermically more stable bicyclic compounds [R = Me: 4a; R = C(Me)=CH2: 4b], 4
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e6b523ec47eeeac1bd493d5739b9eaf0
https://doi.org/10.1515/znb-1995-0619
Zobrazit plný text záznamu
8
Ein tricyclisches Tetraboradisiladodecan aus Dimethyl-di-1-propinylsilan und Ethyldiboranen(6) / A Tricyclic Tetraboradisiladodecane from Dimethyl-di-1-propynylsilane and Ethyldiboranes(6)
Autor: Bernd Wrackmeyer, Roland Boese, Günter Seidel, Roland Köster
Publikováno v: Zeitschrift für Naturforschung B. 50:439-447
The exhaustive hydroboration of the (C ≡ C )-groups in Me2Si(C ≡ CMe)2 (A ) by adding ethyldiboranes(6) at room temperature is presumed to lead initially to the formation of a mixture of the threo- and erythro-3,3,5,6-tetrakis(diethylboryl)-4,4-d
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::20d2afc505ec0aaac0d505171016b528
https://doi.org/10.1515/znb-1995-0319
Zobrazit plný text záznamu
9
(Organoboryl)sulfate — Herstellung und Charakterisierung [1]
Autor: Dieter Bläser, Roland Boese, Wilhelm Schüßler, Roland Köster
Publikováno v: Chemische Berichte. 127:1593-1598
Organoboryl Sulfates — Preparation and Characterisation[1] Triethylborane (3) reacts with sulfuric acid to form the sulfate Et2BOS(O2)OBEt2 (1a), which can also be prepared from (Et2B)2O (4a) and SO3. Sulfate 1a reacts with (C8H14B)2O (4b) to give
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b0a658d207a70ef3a7c5d8029884f733
https://doi.org/10.1002/cber.19941270907
Zobrazit plný text záznamu
10
Chelat‐stabilisierte 1,3‐Bis(acyloxy)‐1,3‐diethyldiboroxane aus Triethylboroxin und Carbonsäureanhydriden
Autor: Dieter Bläser, Roland Köster, Roland Boese, Wilhelm Schüßler, Andrzej Sporzyński
Publikováno v: Chemische Berichte. 127:1191-1199
Chelate-Stabilized 1,3-Bis(acyloxy)-1,3-diethyldiboroxanes from Triethylboroxin and Carboxylic Acid Anhydrides Triethylboroxin (A) reacts with carboxylic acid anhydrides (RCO)2O [R = Me: 1a; Et: 1b; tBu: 1d; Ph: 1e] with various rates to give high yi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e32e605b87dde75039c51e0f9d3eaea7
https://doi.org/10.1002/cber.19941270704
Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání

Omezení vyhledávání
Plný text Recenzováno Digitální knihovna AV ČR
Zdroje