| | 1 | Author
| D. Ietm Ar Stalke, Nayla Keweloh, Uwe Klingebiel, M. Atthias, N. Oltem Eyer, G. Eorge, M. Sheldrick | Requires cookie* | | | Title
| Von lithiierten Aminofluorsilanen zu mono-und dimeren Iminosilanen From Lithiated Aminofluorosilanes to Mono-and Dimeric Iminosilanes  | | | | Abstract
| Depending on the solvent and the bulkiness of the substituents, lithiated aminofluorosilanes are dimers, monomers, or LiF-adducts of iminosilanes. In the crystal structure of the dimeric lithium derivative of di-terr-butyl(/m-butylamino)fluorosilane, each lithium atom is coordinated by one fluorine and two nitrogen atoms. LiF-elimination leads — if sterically possible — to dimerisation. The limits of dimerisation are reached with the dimer diisopropyl(trwm-butylphenyl-imino)silane, for which the crystal structure analysis shows severe steric distortions. Fluorine-chlorine-exchange occurs in reactions of lithiated (tri-fm-butylphenylimino)fluorosilanes with Me3SiCl. Iminosilanes are obtained by thermal LiCl-elimination from the resulting salts. | | | |
Reference
| Z. Naturforsch. 42b, 1237—1244 (1987); eingegangen am 4. Mai/25. Juni 1987 | | | |
Published
| 1987 | | | |
Keywords
| Aminofluorosilanes, Lithium Salts, Cyclisation, Iminosilanes, Crystal Structure | | | |
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| default:Reihe_B/42/ZNB-1987-42b-1237.pdf | | | | Identifier
| ZNB-1987-42b-1237 | | | | Volume
| 42 | |
| 2 | Author
| Kerstin Dippel, Uwe Klingebiel | Requires cookie* | | | Title
| Kontraktionsreaktionen lithiierter Cyclotetrasilazane zu Cyclotri-und Cyclodisilazanen C ontraction Reactions of Lithiated Cyclotetrasilazanes Yielding Cyclotri-and Cyclodisilazanes | | | | Abstract
| The lithium derivate o f the octamethylcyclotetrasilazane 1 reacts with fluorosilanes with substitution (2) or substitution and contraction to give cyclotrisilazanes (3 —6). Lithiated 6 again reacts with substitution (7, 11, 12) or substitution and isomerization to give l,3 -(S i-N -S i) substituted cyclodisilazanes (8 , 13). Starting with the dilithiated eight mem-bered ring (14) the reactions with fluorosilanes lead to the formation o f the unsymmetrically l-(S i)-3 -(S i-N -S i-N -S i)-s u b s titu te d four mem bered rings (9, 10). The isomerization o f the lithium salts depends on thermal, thermodynamic and kinetic effects. | | | |
Reference
| Z. Naturforsch. 45b, 1147—1154 (1990); eingegangen am 26. Januar 1990 | | | |
Published
| 1990 | | | |
Keywords
| Cyclotetrasilazane, Lithium Salts, Isomerization, Cyclodisilazanes, Cyclotrisilazanes | | | |
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| default:Reihe_B/45/ZNB-1990-45b-1147.pdf | | | | Identifier
| ZNB-1990-45b-1147 | | | | Volume
| 45 | |
| 3 | Author
| R. Oland Boese, D. Ieter Bläser, M. Bolatiana Andrianarison, Uwe Klingebiel | Requires cookie* | | | Title
| Lithio-di-terf-butylfluorsilyl-te/t-butylphosphan — Kristallstruktur und Reaktionen Lithio-di-terf-butylfluorosilyl-ferr-butylphosphane — Crystal Structure and Reactions | | | | Abstract
| Di-/er/-butylfluorosilyl-fe/7-butylphosphane (1) reacts with «-C 4H gLi to give the lithium salt (C M e3)2S iF —PLi(TFIF)3CM e3 (2) and butane. The crystal structure o f 2 has been determ ined. Fluorosilylphosphanes of the type (C M e3)2SiFP(R)C M e3 [R = SiM e3 (5), SiCl2Me (6). SiCl3 (7), SiF2CA H 5 (8), B F N (SiM e3)2 (9), SiClM eP(CM e3)SiF(CM e3)2 (10)] are obtained in the reaction of 2 with halogenosilanes and -borane. 6 and 7 undergo rearrangement via chloro-fluoro exchange reaction to give (C M e3)2S iC l-P (S iC lR F)C M e3 [R = Cl (11), Me (12)]. | | | |
Reference
| Z. Naturforsch. 44b, 265 (1989); eingegangen am 7. N ovem ber 1988 | | | |
Published
| 1989 | | | |
Keywords
| F luorosilylphosphanes, Lithium Salt, Crystal Structure Phosphasilene, Fluoro-C hloro Exchange | | | |
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| default:Reihe_B/44/ZNB-1989-44b-0265.pdf | | | | Identifier
| ZNB-1989-44b-0265 | | | | Volume
| 44 | |
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