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  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 771-774 
    ISSN: 0044-2313
    Keywords: Zirconocene complexes ; crystal structure cyclopentadienyl compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Molecular Structure of [1,3-(Me3Si)2C5H3](Me3SiC5H4)ZrCl2.The unsymmetrically substituted zirconocene dichloride was prepared by reaction of trimethylsilylcyclopentadienyl lithium and 1,3-bis(trimethylsilyl)cyclopentadienyl lithium with ZrCl4 · 2 THF. The molecular structure was determined (P21/a; a = 1 357.9, b = 1 900.0, c = 1 043.2 pm, β = 105,16°). The Zr—Cl distance are remarkably short.
    Notes: Das unsymmetrisch substituierte Zirconocendichlorid entsteht aus (Trimethylsilyl-cyclopentadienyl)lithium und 1,3-[Bis(trimethylsilyl)cyclopentadienyl]lithium mit ZrCl4 · 2 THF. Die Molekülstruktur wurde ermittelt (P21/a; a = 1 357,9, b = 1 900,0, c = 1 043,2 pm, β = 105,16°), auffallend sind kurze Zr—Cl-Abstände.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 377-384 
    ISSN: 0044-2313
    Keywords: One-pot reactions of tri-t-butoxychlorosilane, K-t-butanolate and substituted anilines. Crystal structure analyses of N-(tri-t-butoxysilyl)-aniline, C18H33NO3Si ; N-(tri-t-butoxysilyl)-p-nitroaniline, C18H32N2O5Si ; N-Methyl-(N-tri-t-butoxysilyl)-p-nitroaniline C19H34N2O5Si ; N-(tri-t-butoxysilyl)-p-cyanoaniline, C19H32N2O3Si ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation and Structures of N-(tri-t-butoxysilyl)aniline CompoundsPara-substituted N-(tri-t-butoxysilyl)anilines (t-BuO)3SiNRC4H4X-p, R = H, CH3, with substituents of high electron affinity (X = CN, NO2) were prepared by a one-pot reaction of tri-t-butoxychlorsilane, potassium t-butanolate and substituted anilines. Corresponding compounds with substituents of low electron affinity (X = OMe, H) preferably were prepared by metalation of anilines with sodium amide. Four crystal structures were determined. N-(tri-t-butoxysilyl)-p-nitro-aniline, N-methyl-(N-tri-t-butoxysilyl)-p-nitroaniline and N-(tri-t-butoxysilyl)-p-cyanoaniline crystallize at 298 K monoclinically, N-(tri-t-butoxysilyl)aniline crystallizes orthorhombically.
    Notes: Derivate des para-substituierten N-(Tri-t-butoxysilyl)anilins (t-BuO)3SiNRC6H4X-p, R = H, CH3 mit Substituenten hoher Elektronenaffinität (X = CN, NO2) wurden nach einem neuen Eintopfverfahren aus Tri-t-butoxychlorsilan, Kalium-t-butanolat und dem entsprechend substituierten Anilin dargestellt. Für Substituenten niederer Elektronenaffinität (X = OMe, H) wird die Methode der Metallierung von Anilinen mit Natriumamid bevorzugt. Vier Kristallstrukturen wurden bestimmt. N-(Tri-t-butoxysilyl)-p-nitroanilin, N-Methyl-(N-tri-t-butoxysilyl)-p-nitroanilin und N-(Tri-t-butoxysilyl)-p-cyanoanilin kristallisieren bei 298 K monoklin, N-(Tri-t-butoxysilyl)anilin kristallisiert orthorhombisch.
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  • 13
    ISSN: 0044-2313
    Keywords: Carbosilanes ; Cu-catalyzed reactions of silicon with C-chlorinated 1,1,3,3,5,5-hexachloro-1,3,5-trisilacyclohexanes ; crystal structures of hexadecachloro-1,3,5,7,9,11,13,14-octasiladispiro[5.1.5.1]tetradecane ; decachloro-1,3,5,7,9,11-hexasilatricyclo[6.4.0.02,7]dodecane and decachloro-2-trichlorosilyl-1,3,5,7,9,11-hexasilatricyclo[6.4.0.02,7]dodecane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Organosilicon Compounds 113. Reactions of C-chlorinated 1,1,3,3,5,5-Hexachloro-1,3,5-trisilacyclohexanes with Si(Cu cat.). Structures of Hexadecachloro-1,3,5,7,9,11,13,14-octasiladispiro[5.1.5.1]tetradecane 12, Decachloro-1,3,5,7,9,11-hexasilatricyclo[6.4.0.02,7]dodecane 13 and Decachloro-2-trichlorosilyl-1,3,5,7,9,11-hexasilatricyclo[6.4.0.02,7]dodecane 14Elemental Si(Cu cat.) was treated with 1,1,2,2,3,3,5,5-octachloro-1,3,5-trisilacyclohexane 3, 1,1,2,2,3,3,4,4,5,5-decachloro-1,3,5-trisilacyclohexane 4 and with (Cl2Si—CCl2)3 5, resp., in a stirred bed reactor at 330°C. The products can be understood as to be formed by silylation, hydrogenation, degradation, rearrangement and condensation reactions all of them starting from the CCl2 groups of the trisilacyclohexanes. Especially remarkable is Si8C6H8Cl16 12 with a C-spiro linked framework formed by a trisilacyclohexane, a disilacyclobutane and another trisilacyclohexane building block. In two further tricyclic carbosilanes Si6C6H10Cl10 13 and Si7C6H9Cl13 14, two trisilacyclohexane rings each share an opposite Si—C bond with a disilacyclobutane. Another group of compounds includes compounds consisting of two 1,3,5-trisilacyclohexane rings linked by either a C=C or a C=C=C unit. Moreover some derivatives of 1,3-disilacyclopentenes are formed obviously by a contraction of the C-chlorinated 1,3,5-trisilacyclohexane rings. Compound 12 crystallizes in the monoclinic space group P21/n (no. 14) with a = 1 307.8, b = 1 184.2, c = 984.4 pm, β = 93.58° and Z = 2 molecules per unit cell. 13 crystallizes in the triclinic space group P1 (no. 2) with a = 885.7, b = 911.6, c = 868.3 pm, α = 113.15°, β = 75.36° γ = 119.22° and Z = 1. 14 crystallizes in the monoclinic space group P21/c (no. 14) with a = 1853.2, b = 912.9, c = 1725.3 pm, β = 112.69° and Z = 4.
    Notes: 1,1,2,2,3,3,5,5,-Octachlor-1,3,5-trisilacyclohexan 3, 1,1,2,2,3,3,4,4,5,5-Decachlor-1,3,5-trisilacyclohexan 4 und (Cl2Si—CCl2)3 5 wurden mit Si(Cu) bzw. Cu im Rührbett bei 330°C umgesetzt. Die Reaktionen gehen von den CCl2-Gruppen der Trisilacyclohexane aus, und die verschiedenen Reaktionsprodukte sind durch Silylierung, Hydrierung, Kondensation und Umlagerung zu erklären. Besonders bemerkenswert ist das Si8C6H8Cl16 12, in dessen Grundgerüst zwei 1,3,5-Trisilacyclohexane über einen Disilacyclobutanring C-spiroverbrückt sind. In zwei tricyclischen Carbosilanen, Si6C6H10Cl10 13 und Si7C6H9Cl13 14, sind zwei Trisilacyclohexane über einen Disilacyclobutanring verbunden, der unter Ausbildung von zwei Si—C-Bindungen zwischen gegenüberliegenden SiCl- und CCl-Gruppen aufgebaut ist. Eine weitere Gruppe enthält Verbindungen, in denen zwei 1,3,5-Trisilacyclohexanringe entweder über eine C=C- oder C=C=C-Gruppe verbunden sind. Es entstehen auch 1,3-Disilacyclopentenderivate, deren Bildung auf eine Ringverengung der C-chlorierten 1,3,5-Trisilacyclohexane zurückgeführt wird. Verbindung 12 kristallisiert monoklin in der Raumgruppe P21/n (Nr. 14) mit a = 1 307,8, b = 1 184,2, c = 984,4 pm, β = 93,58° und Z = 2 Molekülen pro Elementarzelle; 13: triklin in der Raumgruppe P1 (Nr. 2) mit a = 885,7, b = 911,6, c = 868,3 pm, α = 113,15°, β = 75,36°, γ = 119.22° und Z = 1; 14: monoklin in der Raumgruppe P21/c (Nr. 14) mit a = 1 853,2, b = 912,9, c = 1 725,3 pm, β = 112.69° und Z = 4.
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  • 14
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The VIS-laser irradiation of enol lactones 1a, b and benzoquinone in an argon atmosphere led to the fenestrane-type oxetane 2a and the propellane-type oxetane 2b, with regioselective preference for the acetal structure. Under an oxygen atmosphere both regioisomeric fenestrane-type 1,2,4-trioxanes 4a and 5a were obtained from enol lactone 1a, while no oxygen trapping to the propellane-type trioxanes was observed with 1b. Significant quantities of photooxygenation products were obtained from both enol lactones 1a, b due to singlet oxygen derived from oxygen quenching of benzoquinone triplets. The present study demonstrates that Qinghaosu analoga are accessible via trapping of Paterno-Büchi triplet 1,4-diradicals by molecular oxygen.
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  • 15
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 357 (1968), S. 289-298 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-ray single crystal work on W6Br16 shows the compound containing both polynuclear cations [W6Br8]6+, with effective charge z = 2.33 for the tungsten atoms, and polyanions [Br4]2-. The structure can be described by the formula {[W6Br8i]Br4a}[Br4]2/2a-a. The mean interatomic distances are W—W = 2.64, W—Bri = 2.58, W—Bra = 2,58 Å; linear [Br4]-group with Br—Br = 2.43 (1X) and 2.98 Å (2X).Data: W6Br16; orthorhombic in Bbam-D2h18; a = 14.606, b = 14.262, c = 12.071 Å; dX = 6.290, dexp = 6.09 g · cm-3; Z = 4. Only 394 reflexes of a total of 735 (hkl) are observable; R = 0.12, R' = 0.30; CuKα-radiation.
    Notes: Die Strukturbestimmung an Einkristallen von W6Br16 zeigte, daß die Verbindung nebeneinander polynucleare Kationen [W6Br8]6+ und Anionen [Br4]2- enthält. Die mittlere Oxydationsstufe des Wolframs ist also z = 2,33. Die Struktur kann mit der Formel {[W6Br8i]Br4a}[Br4]2/2a-a beschrieben werden. Die interatomaren Abstände betragen im Mittel: W-W = 2,64; W—Bri bzw, W—Bra-2,58 Å; Br4-Gruppe: linear mit Br—Br = 2,43 (1X) und 2,98 Å (2X).Daten: W6Br16; orthorhombisch in Bbam-D2h18; a = 14,606, b = 14,262, c = 12,071 Å; dRö = 6,290; dpyk = 6,09 g · cm-3; Z = 4. Von 735 Reflexen (hkl) wurden 394 beobachtet; R = 0,12, R' = 0,30; CuKα-Strahlung.
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 396 (1973), S. 66-80 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of Tetracäsium-μ-oxo-decachlordiosmate(IV), Cs4[Os2OCl10]The anhydrous binuclear complex Cs4[Os2OCl10] crystallizes with an orthorhombic unit cell, Pcab, a = 12.521, b = 13.994, c = 11.798 Å and Z = 4 formula units. The complex anion forms corner sharing octahedrons tetragonally deformed. The interatomic distances are Os — O = 1.778 Å and Os — Cl = 2.370 (4×) and 2.433 Å (1×) respectively. The Cs atoms are coordinated differently. The interatomic distances Cs — Cl range from 3.46 to 3.87 Å. The structure is discussed in connection with analogous complexes. Details of other polynuclear complexes of Os are added.
    Notes: Der wasserfreie Zweikernkomplex Cs4[Os2OCl10] kristallisiert orthorhombisch in Pcab mit a = 12,521 Å, b = 13,994 Å, c = 11,798 und Z = 4 Formeleinheiten. Die komplexen Anionen bilden gestreckte, eckenverknüpfte Oktaeder mit Sauerstoff als Brückenatom. Die Bindungsabstände betragen Os — O = l,778 Å und Os — Cl = 2,370 Å (4×) bzw. 2,433 Å (1×). Die Cs-Atonie sind unterschiedlich koordiniert. Die Abstände Cs — Cl liegen im Bereich von 3,46 bis 3,87 Å. Die Struktur wird im Zusammenhang mit analogen Komplexen diskutiert. Es werden Angaben zu weiteren Mehrkernkomplexen des Os gemacht.
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  • 17
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 402 (1973), S. 159-168 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure and Properties of the Blue Chromium(II) Chloride Tetrahydrate CrCl2.4H2OThe blue chromium(II) chloride tetrahydrate CrCl2. 4 H2O crystallizes monoclinic in the space group P21/c with a = 5.904, b = 7.339, c = 8.347 Å and β = 110.10°. The unit cell contains two isolated complexes in which the chromium atoms are coordinated by four short bonded water molecules with square planar configuration (Cr—O = 2.078 Å) and by two chlorine atoms in trans-configuration with long bonds (Cr—Cl = 2.758 Å). This structure may be described by the formula {[Cr(H2O)4]Cl2}. The absorption spectra are discussed on the basis of the structure determination.
    Notes: Das blaue Chrom(II)-chlorid-tetrahydrat CrCl2. 4 H2O kristallisiert monoklin in der Raumgruppe P21/c mit a = 5,904, b = 7,339, c = 8,347 Å und β = 110,10°. Die Elementarzelle enthält zwei isolierte Komplexe, in denen die Chromatome an vier planarquadratisch angeordnete, nahe benachbarte H2O-Molekeln (Cr—O = 2,078 Å) und an zwei transständige, weiter entfernte Cl-Atome (Cr—Cl = 2,758 Å) gebunden sind. Dieser Aufbau läßt sich mit der Formel {[Cr(H2O)4]Cl2} zum Ausdruck bringen. Die Lichtabsorption wird auf der Basis der Strukturbestimmung neu diskutiert.
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  • 18
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 473 (1981), S. 51-58 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N,N-dimethylamido trithiophosphorus acid anhydrideThe reaction between tetraphosphorustrisulfide and bis(dimethylamino)sulfane yields the title compound, which is obtained as four- (I) and six-membered (II) ring molecules. The result of an X-ray analysis of a crystal of I is reported and discussed. Reactions of the title compound with ammonia, dimethylamine, bis(dimethylamino)sulfane, and tris-n-butylphosphane are described.
    Notes: Bei der Reaktion zwischen Tetraphosphortrisulfid und Bis(dimethylamino)-sulfan entsteht die Titelverbindung, die in Form vier- (I) und sechsgliedriger (II) ringförmiger Moleküle anfällt. Das Ergebnis der Röntgenstrukturanalyse eines Kristalls von I wird mitgeteilt und diskutiert. Die Reaktionen der Titelverbindung mit Ammoniak, Dimethylamin, Bis(dimethylamino)-sulfan und Tris-n-butylphosphan sind beschrieben.
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  • 19
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 523 (1985), S. 169-179 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Silicon Sulfur Compounds. XXXII. The Structure of Spiro-bis (ethylendithia) silaneThe reaction between sodium methylene dimercaptide with SiCl4 yielded spiro-bis (ethylendithia)silane. The colorless title compound crystallizes monoclinically with Z = 4 molecules per elementary cell (space group C2/c; a = 1058.4, b = 950.7, c = 1011.9 pm, β = 120.07°; 902 observed unique reflections, R = 0.026). The 4, 4-spiro system nearly is of 222-D2 symmetry. The twisted five-membered rings as well as the deformation of the spiro angle (ε = 74.4°) result in the deviation from mm2-C2 symmetry. The mean bond length [d(Si—S) = 211.6pm] was found to be very short. Comparative MNDO/1-calculations of the molecule and for some ortho-acids give no energy minimum for the observed configuration (ε = 74.4°) but show a reduction of the torsional potential to energies comparable to van der Waals interactions, which are caused at the spiro silicon atom by the twisted 5-membered rings.
    Notes: Spiro-bis(ethylendithia)silan wurde durch Umsetzung von Natrium-ethylendimercaptid mit SiCl4 erhalten. Die farblose Verbindung kristallisiert monoklin mit Z = 4 Molekülen pro Elementarzelle (Raumgruppe C2/c; a = 1058,4 pm; b = 950,7 pm; c = 1011,9 pm; β = 120,07°; 902 Reflexe; R = 0,026). Das aus zwei Fünfringen gebildete Spirosystem besitzt angenähert die Symmetrie 222-D2. Die Abweichungen von der Symmetrie mm2—C2v resultieren aus der Verdrillung der Fünfringe (Twist-Konformation) und einer bemerkenswerten Deformation am Spiro-Siliciumatom (Spirowinkel ε = 74,4°). Die Bindungsabstände d(Si—S) sind mit 211,6 pm sehr kurz. Vergleichende MNDO/1-Rechnungen am Molekül und an einigen Orthosäuren zeigen kein Energiemininum für die beobachtete Konfiguration (ε = 74,4°), jedoch eine Verringerung der Torsionsenergie auf Beträge der van der Waals-Wechselwirkungen durch die Beteiligung verdrillter Fünfring am Spiro-Siliciumatom.
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  • 20
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry and Structural Chemistry of Phosphides and Polyphosphides. 42. Trilithiumheptaphosphide Li3P7: Preparation, Structure, and PropertiesTrilithium heptaphosphide, Li3P7, has been prepared by reaction of the elements at 870 K in Nb and Ta ampoules, respectively. The bright yellow (solventfree) substance crystallizes in a new structure type (P212121; a = 974.2(1) pm; b = 1053,5(1) pm; c = 759,6(1) pm; Z = 4). The structure is closely related to the plastically crystalline Rb3P7 type of structure (Li3Bi variant). The heptaphosphanortricyclene anions P73- are surrounded by 12 Li cations and connected one to each other in a complex manner. The anion exhibits a differentation of distances and angles typical for ionic nortricyclenes X73- (P—P distances: d̄(basis) = 224.9 pm; d̄(basis-bridge) = 214.7 pm; d̄(bridge-bridgehead) = 217.6 pm). The distances Li to P are in the range of 250 ≤ d(Li—(2b)P-) ≤ 270 pm. The P—P and Li—P bond distances are equivalent to meaningful Pauling bond orders PBO. On heating in closed ampoules, Li3P7 shows an endothermic effect at 900 K, corresponding to a first order phase transition into a HT phase of unknown nature up to now. On thermal decomposition no congruent dissociative sublimation occurs in contrast to the other heptaphosphides M3P7, but LiP and Li3P are formed, the latter evaporates congruently dissociative, Solutions of Li3P7 in en show valence fluctuation of the P73- anions already at room temperature (δ 31P-NMR = - 122.1). Further reactions of Li3P7 are reported as well as the structural differences between Li3P7 and the solvates Li3P7solv3 are discussed.
    Notes: Trilithiumheptaphosphid, Li3P7, wird durch Umsatz der Elemente bei 870 K in Nb- bzw. Ta-Ampullen erhalten. Die leuchtend gelbe (solvensfreie) Substanz kristallisiert in einem neuen Strukturtyp (P212121; a = 974,2(1) pm; b = 1053,5(1) pm; c = 759,6(1) pm; Z = 4). Die Struktur hat enge Beziehung zu den plastisch-kristallinen Phasen vom Rb3P7-Typ (Li3Bi-Variante). Die Heptaphosphanortricyclen-Anionen P73- sind jeweils von 12 Li-Kationen umgeben und in komplexer Weise miteinander verknüpft. Das Anion zeigt die für ionische Nortricyclene X73- typische Differenzierung von Abständen und Winkeln (P—P-Abstände: d̄(Basis) = 224,9 pm; d̄(Basis-Brücke) = 214,7 pm und d̄(Brücke-Spitze) = 217,6 pm). Die Abstände Lithium-Phosphor liegen im Bereich 250 ≤ d(Li—(2b)P-) ≤ 270 pm. Den Bindungsabständen P—P und Li—P entsprechen sinnvolle Pauling-Bindungsordnungen PBO. Li3P7 zeigt beim Erhitzen in geschlossenen Ampullen einen thermischen Effekt bei 900 K, der einem Phasenübergang 1. Ordnung in eine noch unbekannte HT-Phase entspricht. Beim thermischen Abbau erfolgt keine kongruente dissoziative Sublimation wie bei den anderen Heptaphosphiden M3P7, sondern Zersetzung zu LiP bzw. Li3P, welches dann kongruent dissoziativ verdampft. Lösungen von Li3P7 in en zeigen schon bei Raumtemperatur Valenzfluktuation des P73--Anions (δ31P-NMR = -122,1). Über weitere Umsetzungen von Li3P7 wird berichtet. Die strukturellen Unterschiede zwischen Li3P7 und Solvaten Li3P7solv3 werden diskutiert.
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