bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mobile anonymity of dynamic groups in vehicular networks
Authors: Xi Yong , Shi Weisong , Schwiebert Loren 
Published: May 2008

AbstractVehicular networks are an emerging network to improve safety, efficiency, and convenience of the existing transportation system. In order to preserve privacy in vehicular networks, it is desirable to keep users anonymous. In this paper, we argue that existing approaches, for example, ring singature and anonymous authentication, are susceptible to intersection attack in vehicular networks, resulting in reduced anonymity, even no anonymity. To quantify the achievable anonymity, we first define a graph‐based model called mobile anonymity for a general dynamic environment. We show that under this model, anonymity can be achieved on the system level as long as the constructed anonymity graph is strongly connected. We then extend this model into vehicular networks by applying it to ring signature and anonymous authentication in vehicular networks. We propose two strategies, the random (RND) strategy and the latest‐preferred (LPR) strategy, and evaluate them via simulation using the C3 simulator. The results show that it is promising to apply RND strategy in vehicular networks. Copyright © 2008 John Wiley & Sons, Ltd.
On the security of context‐adaptive information dissemination
Authors: Schoch Elmar , Keppler Moritz , Kargl Frank , Weber Michael 
Published: May 2008

AbstractInformation dissemination rather than traditional routing is useful for many application domains in mobile ad hoc networks. Context‐adaptive information dissemination is a special variant, which was originally designed for vehicular ad hoc networks (VANETs), but could also be used in other domains, for example, disaster management. In this work, we address the security of this dissemination scheme. The attack analysis shows weaknesses but also how the adaption to context already limits the impact of many attacks. We present and evaluate a sensor‐based protection system helping to reduce the margin for attacks to a level of local disturbance, while the overall dissemination is not affected significantly any more. Copyright © 2008 John Wiley & Sons, Ltd.
Local fast re‐authentication for 3G‐WLAN interworking
Authors: Shidhani Ali Al , Leung Victor C. M. 
Published: May 2008

AbstractInterworking third‐generation (3G) mobile communications systems and wireless local area networks (WLANs) is advantageous for both service providers and end users. However, securing such interworking architectures is a challenging task. EAP‐AKA is the security protocol adopted by 3GPP to achieve authentication in 3G‐WLAN interworking architectures. This paper proposes enhancements to EAP‐AKA to improve performance and security during re‐authentication. A novel protocol named local fast re‐authentication (LFR) is proposed to replace the re‐authentication protocols in EAP‐AKA. The EAP‐AKA key hierarchy is restructured to suit the needs of LFR. Evaluations show that LFR is superior to the re‐authentication protocols in EAP‐AKA in terms of performance and security. LFR has been tested by the automated validation of internet security protocols and applications (AVISPA) security verification tool and proved to be secure.. Copyright © 2008 John Wiley & Sons, Ltd.
Basal levels of salivary chromogranin A, but not α‐amylase, are related to plasma norepinephrine in the morning
Authors: Toda Masahiro , Den Rei , Morimoto Kanehisa 
Published: May 2008

AbstractTo evaluate the activity of sympatho–adrenomedullary (SAM) system, testing for salivary chromogranin A (CgA) and α‐amylase (sAA) has been receiving attention. We investigated the correlation between levels of plasma norepinephrine (NE) and salivary CgA or sAA. From 21 healthy males, blood and saliva samples were collected at 8:00, 10:30, 12:30 and 17:30. Levels of plasma NE, salivary CgA and sAA were determined at each sampling point. To avoid the influence of the salivary flow, resultant levels of salivary CgA and sAA were adjusted according to salivary flow rates and salivary protein, respectively. A significant correlation between plasma NE levels and salivary CgA/protein was detected in samples taken at 8:00 (p < 0.01). In samples taken at 10:30, 12:30 and 17:30, however, there was no such correlation. Meanwhile, no significant correlation between plasma NE levels and sAA/min was detected during the sampling period. These findings suggest that morning results for CgA may be useful as a predictor for SAM system activity. Copyright © 2008 John Wiley & Sons, Ltd.
Erweiterter Einsatz von Turbomolekular Vakuumpumpen durch Beschichtungen
Authors: Froitzheim Michael , Heppekausen Josef 
Published: May 2008

AbstractTurbomolekular‐Pumpen (TMP) können in einem weiten Druckspektrum zur Förderung der meisten Gase in vielfältiger Applikation eingesetzt werden.Einschränkungen ergeben sich im Wesentlichen durch die thermische und chemische Belastbarkeit insbesondere des mechanisch hochbeanspruchten Pumprotors.Möglichkeiten und Grenzen, die Einsetzbarkeit durch funktionale Schichten zu erweitern, werden in diesem Beitrag behandelt.
Kunststoffoptiken mit Antireflex‐ und Antibeschlageigenschaften durch Plasmaätzen und Beschichtung
Authors: Schulz U. 
Published: May 2008

AbstractNanostrukturen mit reflexmindernden Eigenschaften können durch Plasmabehandlung auf vielfältigen Polymeren erzeugt werden. Eine noppenartige Struktur mit ausgezeichneten optischen Eigenschaften entsteht auf PMMA völlig selbstorganisierend. Auf vielen anderen Materialien wie Polycarbonat und Zeonex oder auch Polymerlacken kann eine schwammartige Strukturbildung durch das vorherige Abscheiden einer sehr dünnen Schicht initiiert werden. Auch diese Oberflächen erreichen hohe Transmissionswerte und lassen sich besser als die noppenartige Struktur mechanisch stabilisieren. Von großem praktischem Interesse sind außerdem Antibeschlag‐ Eigenschaften, die auf den entspiegelten Oberflächen durch das Aufbringen hydrophiler Oxidschichten erreicht werden.
Vakuumbeschichtung von Architekturglas ‐ Ein historischer Abriss
Authors: Gläser H. J. 
Published: May 2008

AbstractBeschichtungen auf Architekturverglasungen werden heute überwiegend für Wärme‐ und Sonnenschutz, als Leitschichten in der Photovoltaik sowie in Kombination mit diesen Anwendungen oder getrennt davon zur Entspiegelung, Verspiegelung und für die Selbstreinigung auf Verglasungsaußenoberflächen bei Bewitterung eingesetzt. Hierzu sind Anlagen erforderlich, auf denen Scheiben mit Abmessungen bis zu 3,21m x 6,00m beschichtet werden können. Schichten, mit denen insbesondere Energie eingespart wird, z.B. in Verbindung mit Wärme‐ und Sonnenschutzgläsern oder mit denen Sonnenenergie umgewandelt wird, z.B. in Photovoltaikmodulen, sind von großem wirtschaftlichem Interesse.Beschichtungstechnologien für die oben genannten Scheibenabmessungen setzen ein hohes Maß an Erfahrungen mit der Physik dünner Schichten voraus. Die wichtigsten Prozesse sind chemische Verfahren bei Atmosphärendruck oder Magnetronsputtern unter Hochvakuum. Der folgende Bericht gibt einen historischen Überblick über die Entwicklung der vakuumbasierten Beschichtungsprozesse für Architekturglas.
ta‐C beschichtete Werkzeuge für die Trockenumformung von Aluminiumblechen
Authors: Weihnacht Volker , Brückner Andreas , Bräunling Sven 
Published: May 2008

AbstractAnhand von Streifenziehversuchen wurde die Eignung ta‐C beschichteter Werkzeugächen zur Umformung von Aluminiumlegierungen untersucht. Dabei zeigte sich, dass ta‐C, die verschleißfesteste Schichtvariante der diamantartigen Kohlenstoffschichten, auch bezüglich des antiadhäsiven Verhaltens sehr vorteilhaft ist. In Versuchen mit AlMg5Mn‐ sowie Al99Mg1‐Blechen konnten unter Verzicht von Ziehhilfsmitteln mehrere hundert Bleche gezogen werden, ohne dass es zu wesentlichen Aluminium‐Anhaftungen am ta‐ächenqualitäten der gezogenen Bleche verschlechterten sich in dem beobachteten Zeitraum. Im Vergleich zu Versuchen mit unbeschichtetem Werkzeug und Ziehhilfsmitteln schneidet die Variante ta‐C‐trocken nahezu ebenbürtig mit einem guten Ziehhilfsmittel ab.In einem Praxistest, dem Clinchen von Aluminiumblechen, bestätigten sich die positiven Ergebnisse aus den Streifenziehversuchen. Offenbar ist es möglich, mit ta‐­C beschichteten Clinchstempeln unter völligem Verzicht auf Schmiermittel eine größere Anzahl von Clinchvorgängen durchzuführen, ohne dass es zu merklichen Aluminium‐Anhaftungen am Werkzeug und damit zu einer Erhöhung der Abstreifkräfte kommt.
Evaluierung von Abpumpkurven am Beispiel einer Glimmentladungsquelle
Authors: Klemm Denis , Hoffmann Volker , Edelmann Christian 
Published: May 2008

AbstractBei modernen GD‐OES‐Geräten (GD‐OES = Glow Discharge Optical Emission Spectrometry) wird die Analysenzeit (Bruttoanalysezeit: 2 ‐ 5 Minuten) wesentlich durch die Abpumpzeit der Quelle und die Zuverlässigkeit der Spektralanalyse ‐ besonders bei der Analyse dünner Schichten (Schichtdicken < 100 nm) ‐ durch die Gas‐ und Oberflächenreinheit in der Quelle bestimmt.Bei einem verwendeten kommerziellen Spektrometergerät konnte durch geeignete Dimensionierung und Konstruktion des Pumpsystems und durch optimierte Führung des Flutungs‐ und Abpumpprozesses die Evakuierungszeit und der Enddruck in der Quelle reduziert sowie die Reinheit des Prozessgases am Ort der Analyse verbessert werden.Eine automatisierte, rechnergestützte Auswertung des zeitlichen Druckverlaufes im Rezipienten wurde entwickelt und gibt dem Anlagenbetreiber Hinweise über mögliche Lecks (z. B. infolge der Abnutzung von Dichtungen) in der Anlage oder über Verunreinigungen innerer Oberflächen, da der zeitliche Druckverlauf durch anlagenspezifische Parameter (u. a. effektives Saugvermögen, Leckrate, Gasabgaberate) bestimmt wird. Mittels Variation dieser Parameter wird die Lösung der Pumpgleichung an die gemessene Druck‐Zeit‐Kurve angepasst. Die dabei gefundenen Parameter sind wichtige Kenngrößen, die den Zustand der Vakuumanlage beschreiben. Damit kann der Anwender rechtzeitig eine Lecksuche durchführen oder Komponenten der Anlage reinigen bzw. ersetzen. Die Kontrolle über den Zustand des Vakuumsystems erhöht die Reproduzierbarkeit der Materialanalyse.
Synthesis and Structural Characterization of Novel Neutral Higher‐Coordinate Silicon(IV) Complexes with SiON3C and SiON4C Skeletons
Authors: González‐García Gerardo , Gutiérrez J. Alfredo , Cota Smaranda , Metz Stefan , Bertermann Rüdiger , Burschka Christian , Tacke Reinhold 
Published: May 2008

AbstractThe neutral pentacoordinate silicon(IV) complex 10 (SiON3C skeleton) and the neutral hexacoordinate silicon(IV) complex 11 (SiON4C skeleton) were synthesized, starting from methyldi(thiocyanato‐N)silane (7). In addition to their monodentate thiocyanato‐N and methyl ligands, these compounds contain a tridentate dianionic O,N,N ligand (10) or a tridentate monoanionic O,N,N ligand (11). Compounds 10 and 11 were characterized by single‐crystal X‐ray diffraction and solid‐state and solution NMR spectroscopy. According to these studies, compounds 10 and 11 exist in solution as well.
Two Sterically Encumbered 1,3,2‐Dioxaphospholanes – Reactions, Comparison of Crystal Structures and Computational Explanations
Authors: Freytag Matthias , Grunenberg Jörg , Jones Peter G. , Schmutzler Reinhard 
Published: May 2008

Abstract3,4,5,6‐Tetrachlorobenzo‐3‐(2,4,6‐tri‐tert‐butylphenyl)‐1,3,2‐dioxaphospholane (2) and benzo‐3‐(2,4,6‐tri‐tert‐butylphenyl)‐1,3,2‐dioxaphospholane (4), in which the reactive PIII‐center lies close to the sterically demanding Mes* group (Mes* = 2,4,6‐tri‐tert‐butylphenyl), were prepared from Mes*–Br and the corresponding P‐chloro‐phospholane. Compounds 2 and 4 reacted with various oxidants, azides, MeSO3CF3 or [(tht)AuCl] (tht = tetrahydrothiophene) to give the expected products. All crystal structures of the products display a strongly distorted Mes* system with a boat conformation of the phenyl ring and appreciable out‐of‐plane deviations of phosphorus and the ortho‐tert‐butyl groups to opposite sides of the ring. Quantum chemical calculations at the DFT (density functional theory) level of theory were used in order to discriminate between intra‐ and intermolecular forces, which are responsible for these distortions.
Syntheses and Structures of the Germanides CaNiGe and MgCoGe as well as Chemical Bonding in CaNiGe and CaNi2Ge2
Authors: Hlukhyy Viktor , Chumalo Nataliya , Zaremba Vasyl' , Fässler Thomas F 
Published: May 2008

AbstractThe intermetallic germanides CaNiGe and MgCoGe have been synthesized from the elements in sealed tantalum tubes in a high‐frequency furnace. The compounds were investigated by X‐ray diffractions both on powders and single crystals: CeFeSi structure type, P4/nmm, a = 4.19341(3), c = 6.6264(1) Å, wR2 = 0.030, 124 F2 values, 10 variable parameters for CaNiGe and a = 3.8960(4), b = 6.1929(11) Å, wR2 = 0.048, 104 F2 values, 10 variable parameters for MgCoGe. In CaNiGe and MgCoGe the transition metal and germanium atoms build [TGe] layers (T = Ni, Co), which are separated by the calcium and magnesium atoms, respectively. The crystal structures of CaNiGe and MgCoGe as well as chemical bonding in CaNiGe and CaNi2Ge2 are discussed in terms of LMTO bond structure calculation and analysis using the Electron Localization Function (ELF). The Ge–Ge bond formation in polyanionic $^{3}_{\infty}\rm [NiGe]^{-}$ network of CaNi2Ge2 can formally be regarded as oxidative coupling product of $^{2}_{\infty}\rm [NiGe]^{2-}$ layers of CaNiGe.
Das 1,3‐Dimethylcyanurat‐Ion als ambidenter Ligand
Authors: Kuhn Norbert , Abu‐Salem Qutaiba , Maichle‐Mößmer Cäcilia , Steimann Manfred 
Published: May 2008

AbstractThe 1,3‐Dimethylcyanurate Ion as an Ambident Ligand1,3‐Dimethyl‐2,4,6‐trioxo‐1,3,5‐triazin (7), (1,3‐dimethylcyanuric acid, DMCH), obtained from the thermolysis of methyl urea, is deprotonated with lithium ethylate. In the resulting dinuclear complex [(DMCLi)2·4 H2O] (8), the heterocyclic anions are linked to the lithium centres with oxygen atoms as its enolate form. In the corresponding silver complex [(DMCAg)2·en] (10), (en = ethylendiamine), N‐coordination of the ligand is observed. The crystal structures of 7, 8, and 10 reveal the presence of intermolecular hydrogen bonds.
Sterically Crowded Terphenylselenium Compounds
Authors: Klapötke Thomas M. , Krumm Burkhard , Polborn Kurt 
Published: May 2008

AbstractExtremely bulky terphenyltriselanes RSeSeSeR with R = 2,6‐(2,4,6‐Me3C6H2)2C6H3 and 2,6‐(2,4,6‐iPr3C6H2)2C6H3 were prepared. The chlorination with sulfuryl chloride resulted in the formation of the corresponding selenenyl chlorides RSeCl. In the case of the methyl substituted derivative, also a chlorination of the mesityl groups was observed and the derivative could be isolated. The molecular structure of the isopropyl substituted triselane [2,6‐(2,4,6‐iPr3C6H2)2C6H3Se]2Se and that of 2,6‐(2,4,6‐Me3C6Cl2)2C6H3SeCl, have been determined by X‐Ray diffraction.
Dimensions of the Ozonide Anion in M([18]crown‐6)O3·x NH3 with M = K (x = 2), Rb (x = 1) and Cs (x = 8)
Authors: Nuss Hanne , Nuss Jürgen , Jansen Martin 
Published: May 2008

AbstractReaction of alkali metal ozonides (KO3, RbO3 and CsO3) with [18]crown‐6 in liquid ammonia yields compounds of the composition M([18]crown‐6)O3·x NH3 with M = K (x = 2), Rb (x = 1) and Cs (x = 8). The large intermolecular distance between adjacent radical anions in these compounds leads to almost ideal paramagnetic behavior according to Curie's law. Discrepancies concerning the structure of the ozonide anions in the K and Cs compound compared to a former investigation on Rb([18]crown‐6)O3·NH3 have been resolved by means of DFT calculations and a single‐crystal structure redetermination.
Bridgman Crystal Growth and Structure Refinement of YbPdGe and YbPtGe – Two Different Superstructures of the KHg2 Type
Authors: Katoh Kenichi , Heying Birgit , Hoffmann Rolf‐Dieter , Rodewald Ute Ch. , Pöttgen Rainer 
Published: May 2008

AbstractWell shaped single crystals of the equiatomic germanides YbPdGe and YbPtGe were synthesized from the elements using the Bridgman technique. The samples were investigated by X‐ray powder and single crystal diffraction: YbAuSn type, Imm2, a = 433.4(2), b = 2050.6(6), c = 752.6(2) pm, wR2 = 0.0723, 1551 F2 values, 58 variables for YbPdGe and TiNiSi type, Pnma, a = 686.32(9), b = 430.47(9), c = 751.02(8) pm, wR2 = 0.0543, 379 F2 values, 20 variables for YbPtGe. Both germanides crystallize with different superstructure variants of the KHg2 type, resulting from different stacking of the puckered Pd3Ge3 and Pt3Ge3 hexagons. While only Pt–Ge interactions occur in the [PtGe] polyanionic network of YbPtGe, weak interlayer Pd–Pd (297 pm) and Ge–Ge (275 pm) interactions occur in YbPdGe. The crystal chemical peculiarities are discussed in the light of the different superstructure formed.
Zur Reaktivität von alkylthioverbrückten 44‐CVE‐triangularen Platinclustern: Umsetzungen mit bidentaten Phosphanliganden
Authors: Albrecht Christian , Bruhn Clemens , Wagner Christoph , Steinborn Dirk 
Published: May 2008

AbstractOn the Reactivity of Alkylthio Bridged 44 CVE Triangular Platinum Clusters: Reactions with Bidentate Phosphine LigandsThe 44 cve (cluster valence electrons) triangular platinum clusters [{Pt(PR3)}3(μ‐SMe)3]Cl (PR3 = PPh3, 2a; P(4‐FC6H4)3, 2b; P(n‐Bu)3, 2c) were found to react with PPh2CH2PPh2 (dppm) in a degradation reaction yielding dinuclear platinum(I) complexes [{Pt(PR3)}2(μ‐SMe)(μ‐dppm)]Cl (PR3 = PPh3, 3a; P(4‐FC6H4)3, 3b; P(n‐Bu)3; 3e) and the platinum(II) complex [Pt(SMe)2(dppm)] (4), whereas the addition of PPh2CH2CH2PPh2 (dppe) to cluster 2a afforded a mixture of degradation products, among others the complexes [Pt(dppe)2] and [Pt(dppe)2]Cl2. On the other hand, the treatment of cluster 2a with PPh2CH2CH2CH2PPh2 (dppp) ended up in the formation of the cationic complex [{Pt(dppp)}2(μ‐SMe)2]Cl2 (5). Furthermore, the terminal PPh3 ligands in complex 3a proved to be subject to substitution by the stronger donating monodentate phosphine ligands PMePh2 and PMe2Ph yielding the analogous complexes [{Pt(PR3)}2(μ‐SMe)(μ‐dppm)]Cl (PR3 = PMePh2, 3c; PMe2Ph, 3d). NMR investigations on complexes 3 showed an inverse correlation of Tolmans electronic parameter ν with the coupling constants 1J(Pt,P) and 1J(Pt,Pt). All compounds were fully characterized by means of NMR and IR spectroscopy. X‐ray diffraction analyses were performed for the complexes [{Pt{P(4‐FC6H4)3}}2(μ‐SMe)(μ‐dppm)]Cl (3b), [Pt(SMe)2(dppm)] (4), and [{Pt(dppp)}2(μ‐SMe)2]Cl2 (5).
Sr5Ge2N6 – A Nitridogermanate with Edge‐sharing Double Tetrahedra
Authors: Junggeburth Sebastian C. , Oeckler Oliver , Schnick Wolfgang 
Published: May 2008

AbstractThe new nitridogermanate Sr5Ge2N6 was obtained as a coarsely crystalline product by Na‐flux technique employing a reaction of Sr, Na, NaN3 and GeO2 in weld shut tantalum‐tubes at temperatures up to 760 °C. The crystal structure was determined by single‐crystal X‐ray methods: (Sr5Ge2N6, space group C2/c (no. 15), a = 1040.8(2), b = 652.08(13), c = 1356.5(3) pm, β = 100.29(3)°, V = 905.8(3)·106 pm3, Z = 4, 1240 observed reflections, 61 parameters, R1 = 0.031). In the solid, there are edge‐sharing [Ge2N6]10− double tetrahedra surrounded by Sr2+ ions. Sr5Ge2N6 was found to be isotypic with Ca5Si2N6.
Subvalente Galliumtriflate – mögliche Ausgangsverbindungen für Clusterverbindungen des Galliums
Authors: Linti Gerald , Seifert Annekathrin 
Published: May 2008

AbstractSubvalent Gallium Triflates – Potentially Useful Starting Materials for Gallium Cluster CompoundsBy reaction of GaCp* with trifluormethanesulfonic acid in hexane a mixture of gallium trifluormethanesulfonates (triflates, OTf) is obtained. This mixture reacts readily with lithiumsilanides [Li(thf)3Si(SiMe3)2R] (R = Me, SiMe3) to afford the cluster compounds [Ga6{Si(SiMe3)Me}6], [Ga2{Si(SiMe3)3}4] and [Ga10{Si(SiMe3)3}6]. By crystallization from various solvents the gallium triflates [Ga(OTf)3(thf)3], [HGa(OTf)(thf)4]+ [Ga(OTf)4(thf)3]−, [Cp*GaGa(OTf)2]2 and [Ga(toluene)2]+ [Ga5(OTf)6(Cp*)2]− were isolated and characterized by single crystal X ray structure analysis.
Synthese und Kristallstruktur der Rhenium(VII)‐Nitridchloride ReNCl4 und ReNCl4·H2O
Authors: Binder Anja , Maichle‐Mössmer Cäcilia , Niquet Elke , Strähle Joachim 
Published: May 2008

AbstractSyntheses and Crystal Structures of the Rhenium(VII) Nitride Chlorides ReNCl4 and ReNCl4·H2ORhenium(VII) nitride chloride, ReNCl4 (1) is obtained in form of brown needles with metallic luster by the reaction of ReCl5 with Cl3VNCl at 140 °C under vacuum in a sealed glass ampoule. It crystallizes in the tetragonal space group I4 with the lattice parameters a = 826.7(4), c = 405.1(2) pm, and Z = 2. The square pyramidal molecules are connected by asymmetric nitrido bridges to form chains along the crystallographic c axis. The shorter Re‐N distance of 163.0(5) pm corresponds to a triple bond, while the pronounced longer distance of 242.0(5) pm can be interpreted with a weak donor bond.The reaction of ReCl5 with VN at 170 °C under vacuum in a sealed glass ampoule yields red needles of ReNCl4·H2O (2). It crystallizes in the orthorhombic space group Pnma with a = 1075.4(2), b = 1108.5(2), c = 547.7(5) pm and Z = 4. The Re atoms exhibit a distorted octahedral coordination with the aqua ligand in trans position to the nitrido ligand. The Re‐N triple bond has a bond distance of 166.1(11) pm. The complexes are connected by hydrogen bridges O‐H···N to form chains.
Facile Synthesis and Crystal Structure of 1,1,1,3‐Tetranitro‐3‐azabutane
Authors: Klapötke Thomas M. , Krumm Burkhard , Scherr Matthias , Spieß Gunnar , Steemann F. Xaver 
Published: May 2008

AbstractThe synthesis of 1,1,1,3‐tetranitro‐3‐azabutane is disclosed and compared with the known method. The structure of 1,1,1,3‐tetranitro‐3‐azabutane is identified by multi‐nuclear NMR spectroscopy and X‐ray single crystal structure determination.
Synthesis and Structural Characterization of Some Novel Trialkylsilyl‐substituted Lithium Benzyl Complexes [Li(tmeda)][CHRSiMe2R′] (R = Ph, 3,5‐Me2C6H3; R′ = Me, tBu, Ph)
Authors: Schumann Herbert , Freckmann Dominique M. M. , Dechert Sebastian 
Published: May 2008

AbstractThe reactions of PhCH2SiMe3 (1), PhCH2SiMe2tBu (2), PhCH2SiMe2Ph (3), 3,5‐Me2C6H3CH2SiMe3 (4), and 3,5‐Me2C6H3CH2SiMe2tBu (5) with nBuLi in tetramethylethylenediamine (tmeda) afford the corresponding lithium complexes [Li(tmeda)][CHRSiMe2R′] (R, R′ = Ph, Me (6), Ph, tBu (7), Ph, Ph (8), 3,5‐Me2C6H3, Me (9), and 3,5‐Me2C6H3, tBu (10)), respectively. The new compounds 5, 7, 8, 9 and 10 have been characterized by 1H and 13C NMR spectroscopy, compounds 7, 8 and 9 also by X‐ray structure analysis.
Encapsulation of Triphenylene Derivatives in the Hexanuclear Arene Ruthenium Metallo‐Prismatic Cage [Ru6(p‐PriC6H4Me)6(tpt)2(dhbq)3]6+ (tpt = 2,4,6‐tri(pyridin‐4‐yl)‐1,3,5‐triazine, dhbq = 2,5‐dihydroxy‐1,4‐benzoquinonato)
Authors: Govindaswamy Padavattan , Furrer Julien , Süss‐Fink Georg , Therrien Bruno 
Published: May 2008

AbstractA large cationic triangular metallo‐prism, [Ru6(p‐PriC6H4Me)6(tpt)2(dhbq)3]6+ (1)6+, incorporating p‐cymene ruthenium building blocks, bridged by 2,5‐dihydroxy‐1,4‐benzoquinonato (dhbq) ligands, and connected by two 2,4,6‐tri(pyridin‐4‐yl)‐1,3,5‐triazine (tpt) subunits, allows the permanent encapsulation of the triphenylene derivatives hexahydroxytriphenylene, C18H6(OH)6 and hexamethoxytriphenylene, C18H6(OMe)6. These two cationic carceplex systems [C18H6(OH)6⊂1]6+ and [C18H6(OMe)6⊂1]6+ have been isolated as their triflate salts. The molecular structure of these systems has been established by one‐dimensional 1H ROESY NMR experiments as well as by the single‐crystal structure analysis of [C18H6(OMe)6⊂1][O3SCF3]6.