| | 2 | Author
| Uwe Klingebiel, Lutz Skoda | Requires cookie* | | | Title
| Fluoroboryl-and Fluoroboranediyl-Cyclosilazanes  | | | | Abstract
| Hexamethylcyclotrisilazanes and their lithium salts react with F2BN(SiMe3)2 to give the corres ponding mono-, bis-, and tris(fluoroboryl)cyclotrisilazanes. Di-fluoroboryl-substituted rings are obtained in the reaction of l,3-bis(silyl)-and 1-boryl-cyclotrisilazanes with BF3-etherate. A com pound consisting of two cyclodisilazanes connected by a (SiNBNSi)-bridge is formed in the reaction of lithiated bis(silyl)cyclotrisilazane with BF3-etherate. Ring coupling of two six mem-bered rings occurs in the reaction of lithiated cyclotrisilazane with 1-difluoroboryl-cyclotrisilazane and in the reaction of lithiated bis(fluoroboryl)cyclotrisilazane with BF3-etherate in a molar ratio 2:1. Ring expansion takes place in the reaction of the lithium salt of a four membered SiN-ring with F2BN(SiMe3)2. Substitution occurs in the same reaction with F3SiN(SiMe3)2. | | | |
Reference
| Z. Naturforsch. 40b, 913—918 (1985); eingegangen am 16. März 1985 | | | |
Published
| 1985 | | | |
Keywords
| Cyclosilazanes, Fluoroboranes, Boryl Substitution, Ring Coupling, Ring Expansion | | | |
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| default:Reihe_B/40/ZNB-1985-40b-0913.pdf | | | | Identifier
| ZNB-1985-40b-0913 | | | | Volume
| 40 | |
| 3 | Author
| Ernst Egert, Ursula Kliebisch, Uwe Klingebiel, Dieter Schmidt | Requires cookie* | | | Title
| Cyclodi-und -trisilazane — Synthese, Reaktionen und Ringkopplungen Cyclodi-and -trisilazanes — Synthesis, Reactions and Ring Coupling | | | | Abstract
| Contrary to our expectations, a cyclotrisilazane is obtained instead of a cyclodisilazane by the reaction of the lithiated di-rerf-butyldiamino-silane with Hal 2 SiMe 2 . Mono-and disubstitution takes place in reactions of lithiated tetra-isopropyl cyclodisilazane with halogeno-silanes and -boranes. A disubstituted ring reacts with LiOC 4 H 9 -formed from LiC 4 H y and THF — to give an unsymmetrically substituted four-membered ring as proved by a crystal structure determination. Coupling of four-and six-membered rings occurs in the reaction of SiF-substituted and lithiated rings. | | | |
Reference
| (Z. Naturforsch. 42b, 23—30 [1987]; eingegangen am 1. September 1986) | | | |
Published
| 1987 | | | |
Keywords
| Cyclosilazanes, Substitution, Ring Coupling, Crystal Structure | | | |
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| default:Reihe_B/42/ZNB-1987-42b-0023.pdf | | | | Identifier
| ZNB-1987-42b-0023 | | | | Volume
| 42 | |
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