Synthese linearer und verzweigter Phosphazene aus N-silylierten Phosphorylamiden |
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Authors: | L Riesel C Tschner |
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Institution: | L. Riesel,C. Täschner |
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Abstract: | Synthesis of Lineary and Branched Phosphazenes from N-silylated Phosphoryl Amides The use of N-silylated phosphoryl amides in the reaction with PCl5 favours the KIRSANOV reaction and reduces undesirable substitution reactions. However, silylated monoamides, X2P(O)NHSiMe3 (X = OEt, NEt2), do not give the expected trichlorophosphazenes but the isomeric N-dichlorophosphoryl phosphazenes, Cl2P(O)? N?PClX2, which are also formed in the reaction of (EtO)2P(O)NCl2 with PCl5. As the first phosphoryl-P, P-bis(trichlorophosphazene) (EtO)P(O)(N?PCl3)2 could be obtained in the reaction of PCl5 with the silylated diamide (EtO)P(O)(NHSiMe3)2. Tris reactivity of silylated amides to P? Cl compounds decreases in the row PCl5 > POCl3 > CIP(O)(OEt)2 > ClP(O)(NEt2)2. In the reaction with phosphoryl chlorides the preferred formation of compounds with P? NH? P bridges could not be observed. |
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