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- W2000960980 abstract "Ausgehend vom trihalogensubstituierten Cyclotri(λ3-phosphazan) 1 lassen sich die Derivate 2—12 in glatter Reaktion darstellen. Die sterische Belastbarkeit des Sechsring-systems hat mit X = NEt2 in 11 ihre Grenze erreicht, fur X = NiPr2 tritt nur noch Monosubstitution zu 13 ein, die aber eine Weitersubstitution mit sterisch weniger anspruchsvollen Resten, z. B. auch zu den Bicyclen 14—16 nicht ausschliest. Die NMR-spektroskopischen Daten legen eine Sesselkonformation der Cyclophosphazanringe nahe, wobei die diequatorial-axiale bzw. diaxial-equatoriale Konfiguration der Phosphoratome (c, d) als thermodynamisch gunstigere Alternative zu a oder b verwirklicht ist. Es wird erstmals uber eine Ringkontraktion vom Sechs- zum Vierring in der Reihe der Cyclo(λ3-phosphazane) berichtet.Cyclotri(λ3-phosphazanes) (XPNMe)3: Preparation, NMR-Data, and StructureCyclotri(λ3-phosphazanes) 2–12 are easily prepared from the trihalogeno substituted 1. For steric reasons there is only a monosubstitution with X = NiPr2 to 13, which nevertheless may be further substituted by sterically less demanding substituents to give e.g. the bicyclic compounds 14—16. From NMR spectroscopic data a chair conformation of the six membered ring seems probable with the substituents at phosphorus being located either diequatorially axially (c) or vice versa (d) rather than a or b. A thermal ring contraction from a six to a four membered ring in the series of cyclo(λ3-phosphazanes) is reported for the first time." @default.
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- W2000960980 date "1981-04-01" @default.
- W2000960980 modified "2023-09-25" @default.
- W2000960980 title "Cyclotri(?3-phosphazane) (XPNMe)3: Darstellung, NMR-Spektren und Struktur" @default.
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- W2000960980 doi "https://doi.org/10.1002/zaac.19814750428" @default.
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