| | 1 | Author
| Amal Haoudi-M, Ahmed Azzah, Hans-Georg Mazzah, M. Schmidt, H. Athias Noltemeyer, W. Erbert, Roesky | Requires cookie* | | | Title
| Synthese und Struktur von achtgliedrigen Titan-und Zirkon-haltigen Siloxanringen Synthesis and Structure of Eight-Membered Titanium and Zirconium Containing Siloxane Rings  | | | | Abstract
| Reaction o f (fBu)2Si(OH)2 with TiCl4, TiBr4, T il4, and ZrCl4 affords eight-membered rings | | | |
Reference
| Z. Naturforsch. 46b, 587—5 (1991); eingegangen am 23. Juli 1990 | | | |
Published
| 1991 | | | |
Keywords
| Titanium, Zirconium, Siloxane, Heterocycles | | | |
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| default:Reihe_B/46/ZNB-1991-46b-0587.pdf | | | | Identifier
| ZNB-1991-46b-0587 | | | | Volume
| 46 | |
| 2 | Author
| P. Jutzi, C. Batz, A. Mutluay | Requires cookie* | | | Title
| Eightfold Functionalization of the Octasilsesquioxane Core | | | | Abstract
| Eightfold functionalized octasilsesquioxanes (R8Si80 12) are synthesized using the hydro silylation method. D ifferent types of groups R, consisting of an (-0 -S i M e 2(CH 2)2) spacer unit and various terminal units (-C H 2(C2M e)B 1oH1o, -C 5H 3M eM n(CO)3, -S iM e2C5H 4FeC5H 5 , -S iM e2Cl, -SiM eC l2, -S i(O E t)3) have been introduced. The hydro silylation products have been characterized by 'H, 13C, 29Si NMR and infrared spectroscopy and elemental analysis. The redox properties of the ferrocenyl substituted compound have been studied by cyclovoltammetry. Results | | | |
Reference
| Z. Naturforsch. 49b, 1689—1692 (1994); received May 17 1994 | | | |
Published
| 1994 | | | |
Keywords
| Octasilsesquioxanes, Hydrosilylation, Siloxanes, Ferrocenes, Carboranes | | | |
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| default:Reihe_B/49/ZNB-1994-49b-1689.pdf | | | | Identifier
| ZNB-1994-49b-1689 | | | | Volume
| 49 | |
| 3 | Author
| Dieter Schmidt-Bäse, Uwe Klingebiel | Requires cookie* | | | Title
| Von 1,5-funktionelIen Trisiloxanen zu (SiO)4-, [Si(OSiN)2Si]-und [0 (S i0 S i)2N]-Ringen From 1,5-Functional Trisiloxanes to (SiO)4-, [Si(OSiN)2Si]-, and [0(Si0Si)2N]-Rings | | | | Abstract
| C om pounds of the general formula (CM e3)2Si(R)O H , (R = Cl, O H . N H :) react with «-C 4H,,Li or Na to give the alkali silanolates 1—5 .1 —5 serve as starting materials in the reactionsw ithchlorosilanes for the synthesis o f siloxanes (6—12). Ring closure reactions of dilithiated 9 ,1 1 , and 12 occur with SiCl4 (13) and C l,SiM e, (15, 16). 13 contains an (SiO)4. 15 an Si(O SiN),Si. and 16 an 0 (S i0 S i) ,N eight-m em bered ring. Hydrolysis o f 13 leads to the formation o f the hydroxy-substituted eight-m em bered ring 14. The crystal structures of (C M e3),S i(O H) —O —SiM e, —Ö —(H ,N)S i(C M e3), (11) and M e,Si[O Si(C M e3),N H ],S iM e, (15) are reported and discussed. | | | |
Reference
| Z. Naturforsch. 44b, 395 (1989); eingegangen am 16. D ezem ber 1988/23. Januar 1989 | | | |
Published
| 1989 | | | |
Keywords
| Silanolates, Siloxanes, Am inosiloxanol Eight-M embered Rings, Crystal Structure | | | |
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| default:Reihe_B/44/ZNB-1989-44b-0395.pdf | | | | Identifier
| ZNB-1989-44b-0395 | | | | Volume
| 44 | |
| 4 | Author
| Feng-Quan Liu, Hans-Georg Schmidt, M. Athias Noltemeyer, Cristina Freire-Erdbrügger, GeorgeM. Sheldrick, HerbertW. Roesky | Requires cookie* | | | Title
| Synthesis and Structure of Eight-Membered Titanium Containing Siloxane Rings | | | | Abstract
| The preparation by different methods o f the eight-membered ring com pounds (R 'X T i0S iR 220) 2 is reported: (2: R' = C5H 5, X=C1, R2=/Bu; 3: R '= N (S iM e3)2, X=C1, R 2=/Bu; 4: R' = C 5M e5, X = C1, R 2=Ph; 6: R' = X = N E t2, R 2=fB u). The six-membered ring Ph2SiO[OTiC5M e5(Cl)]2 5 is formed together with 4 by the reaction o f C5M e5TiCl3 and Ph2Si(OLi)2. Com pounds 2 and 4 have been characterized by X-ray structural analysis. | | | |
Reference
| Z. Naturforsch. 47b, 1085—1090 (1992); received March 2 1992 | | | |
Published
| 1992 | | | |
Keywords
| Organotitanium, Amides, Siloxanes, Eight-Membered Rings | | | |
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| default:Reihe_B/47/ZNB-1992-47b-1085.pdf | | | | Identifier
| ZNB-1992-47b-1085 | | | | Volume
| 47 | |
| 5 | Author
| Marcus Branda, Albert Fringsd, Peter Jenkner0, Robert Lehnerta, HansJürgen Mettemicha, Jaroslaw Monkiewiczd, Jürgen Schramc, HülsStructura Gmbh, Friedrich Von, Heyden Platz | Requires cookie* | | | Title
| NMR-spektroskopische Untersuchungen zur Hydrolyse von funktionellen Trialkoxysilanen NMR-Spectroscopic Investigations on the Hydrolysis of Functional Trialkoxysilanes | | | | Abstract
| The hydrolysis of functional trialkoxysilanes was studied under various conditions by 'H NMR spectroscopy. The silane concentration was 1 -2% by weight in a water/acetone-system. Under these conditions, the reaction was found to be first order. In detail, influence of pH, grade of stirring, and size and structure of functional groups of the alkyltrialkoxysilanes were investigated in order to compare the relative reaction rates of the different compounds. | | | |
Reference
| Z. Naturforsch. 54b, 155—164 (1999); eingegangen am 9. September 1998 | | | |
Published
| 1999 | | | |
Keywords
| Organofunctional Silanes, Trialkoxysilanes, Tetraalkoxysilanes, Hydrolysis, Siloxanes | | | |
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| default:Reihe_B/54/ZNB-1999-54b-0155.pdf | | | | Identifier
| ZNB-1999-54b-0155 | | | | Volume
| 54 | |
| 6 | Author
| Christian Egger, Ulrich Schubert | Requires cookie* | | | Title
| Metallkomplexe in Anorganischen Matrices, 5 [1] Katalytische Silanoxidation an einem heterogenisierten Rhodium-Komplex M etal Complexes in Inorganic Matrices, 5 [1] Catalytic Silane Oxidation at a Heterogenized Rhodium Complex | | | | Abstract
| A heterogenized rhodium complex, prepared by sol-gel processing of Rh(CO)Cl[PPh2C H 2C H 2Si(OEt)3]2 and Si(OEt)4, is shown to catalyze the conversion of the si lanes H4_"SiPh" (n = 1 -3) or (H M e2Si)20 to (poly)siloxanes by air or water. Using T H F as a solvent, the silanoles Ph3SiOH or Ph2Si(OH)2 are obtained instead. The reaction of phenyl-acetic acid or acetic acid with HSiPh3 to give silyl esters is catalyzed by the same com pound. | | | |
Reference
| Z. Naturforsch. 46b, 783—788 (1991); eingegangen am 14. Januar 1991 | | | |
Published
| 1991 | | | |
Keywords
| Heterogenized Rhodium Complex, Catalysis, Silanes, Silanoles, Siloxanes, Silyl Esters | | | |
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| default:Reihe_B/46/ZNB-1991-46b-0783.pdf | | | | Identifier
| ZNB-1991-46b-0783 | | | | Volume
| 46 | |
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