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312 research data, page 1 of 32

Constitution of Grignard Reagent RMgCl in Tetrahydrofuran

Sakamoto, Shigeru; Imamoto, Tsuneo; Yamaguchi, Kentaro (2001)
Publisher: Figshare
The constitution of Grignard reagent, RMgCl (R = Me, tBu, Ph or benzyl), was investigated in the solid state by means of X-ray crystallography and in THF by coldspray ionization mass spectrometry (CSI-MS). Three types of crystal structures, (a) [Mg2(μ-Cl3)(THF)6]+·[RMgCl2(THF)]-, (b) R2Mg4Cl6(THF)6, and (c) [2Mg2(μ-Cl3)(THF)6]+·[R4Mg2Cl2]2-, were identified, and MeMg2(μ-Cl3)(THF)4-6 were detected as major species of MeMgCl in solution.

A Multiple Hydrogen-Bond Scaffold Based on Dipyrimidin-2-ylamine

Söntjens, Serge H. M; Meijer, Joris T.; Kooijman, Huub; Spek, Anthony L.; van Genderen, Marcel H. P.; Sijbesma, Rint P.; Meijer, E. W. (2001)
Publisher: Figshare
A multiple hydrogen-bond array based on dipyrimidin-2-ylamine is presented, which is easily accessible. The influence of a preorganizing intramolecular hydrogen bond, tautomeric equilibria, and steric effects on the association behavior were investigated. X-ray diffraction shows that the molecules feature an ADA (acceptor−donor−acceptor) array of hydrogen-bonding sites in the solid state. The array persists in solution, and 1H NMR titrations show that molecules with sterically nondem...

Increasing the Lipophilic Character of Tetraphenylborate Anions through Silyl Substituents

van den Broeke, Joep; Lutz, Martin; Kooijman, Huub; Spek, Anthony L.; Deelman, Berth-Jan; Koten, Gerard van (2001)
Publisher: Figshare
Trimethylsilyl- and dimethyl(1H,1H,2H,2H-perfluorooctyl)silyl substituents have been introduced in the para position of tetraphenylborate anions, resulting in enhanced solubility of their complexes n-Bu4N[B(C6H4SiMe2R-4)4] (R = Me, CH2CH2C6F13) and [Rh(dppe)2][B(C6H4SiMe2R-4)4] (dppe = 1,2-bis(diphenylphosphino)ethane, R = Me, CH2CH2C6F13) in apolar organic solvents.

Patientensouveränität : der autonome Patient im Mittelpunkt

Dierks, Marie-Luise; Bitzer, Eva-Maria; Lerch, Magnus; Martin, Sabine; Röseler, Sabine; Schienkiewitz, Anja; Siebeneick, Stefanie; Schwartz, Friedrich-Wilhelm (2001)
Publisher: Universität Stuttgart
Embargo end date: 2016/03/31
In Anbetracht des wachsenden finanziellen Drucks auf die sozialen Sicherungssysteme drängt sich immer stärker die Frage auf, ob sich in Zukunft die Errungenschaften der modernen Medizin im Rahmen einer allgemeinen Gesundheitsversorgung bei weitgehend stabilen Beitragssätzen zur gesetzlichen Krankenversicherung (GKV) überhaupt noch finanzieren lassen. Die in den inzwischen zahlreich vorliegenden Untersuchungen formulierten Vorschläge für Maßnahmen zur Weiterentwicklung des Gesundheitssystems z...

Pyrazolylborate−Zinc−Hydrosulfide Complexes and Their Reactions

Rombach, Michael; Vahrenkamp, Heinrich (2001)
Publisher: Figshare
Four new hydrosulfide complexes Tp*Zn−SH of substituted pyrazolylborate ligands (Tp*) were prepared by reactions of Tp*Zn−OH with H2S, and three of them were structurally characterized. Unlike the Tp*Zn−OH complexes they do not react with esters, phosphates, or CO2, e.g. for thiolytic cleavage reactions. They also cannot be deprotonated, as various bases induce precipitation of ZnS and release of anionic Tp*. Acidic organic X−OH compounds (carboxylic acids, trinitrophenol, hexaflu...

Synthesis, pH-Dependent Structural Characterization, and Solution Behavior of Aqueous Aluminum and Gallium Citrate Complexes

Matzapetakis, M.; Kourgiantakis, M.; Dakanali, M.; Raptopoulou, C. P.; Terzis, A.; Lakatos, A.; Kiss, T.; Banyai, I.; Iordanidis, L.; Mavromoustakos, T.; Salifoglou, A. (2001)
Publisher: Figshare
Reactions of Al(III) and Ga(III) with citric acid in aqueous solutions, yielded the complexes (NH4)5{M(C6H4O7)2}·2H2O (M(III) = Al (1), Ga (2)) at alkaline pH, and the complexes (Cat)4{M(C6H5O7)(C6H4O7)}·nH2O (M(III) = Al (3), Ga (4), Cat. = NH4+, n = 3; M(III) = Al (5), Ga (6), Cat. = K+, n = 4) at acidic pH. All compounds were characterized by spectroscopic (FT-IR, 1H, 13C, and 27Al NMR, 13C-MAS NMR) and X-ray techniques. Complex 1 crystallizes in space group P1̄, with a = 9.638(5)...

The Syntheses of Amphiphilic Camouflaged Carboranes as Modules for Supramolecular Construction

Maderna, A.; Herzog, A.; Knobler, Carolyn B.; Hawthorne, M. Frederick (2001)
Publisher: Figshare
The Syntheses of Amphiphilic Camouflaged Carboranes as Modules for Supramolecular Construction

Tab. 3: Differentiation of eroded material in the Arctic Russian Seas

Vera A Kosheleva; Dmitry Yashin; Evgeny E Musatov (2001)
Publisher: PANGAEA

On the Validity of the Maximum Hardness and Minimum Polarizability Principles for Nontotally Symmetric Vibrations

Torrent-Sucarrat, Miquel; Luis, Josep M.; Duran, Miquel; Solà, Miquel (2001)
Publisher: Figshare
On the Validity of the Maximum Hardness and Minimum Polarizability Principles for Nontotally Symmetric Vibrations