- Studies of Phosphazenes. Part 13. Thermal Rearrangement Reactions of Some Methoxycyclophosphazenes
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The methoxycyclophosphazenes n (n = 3-6) rearrange on heating to give oxocyclophosphazanes, n.Isomeric products are formed when n = 4-6.The 1H, 31P, and 13C n.m.r. data for the starting materials and the products are presented.The ethoxy- and n-propoxy-derivatives N3P3(OR)6 do not undergo the above rearrangement.The geminal derivatives N3P3R2(OMe)4 (R = Ph or NHBut) on heating yield both fully and partially rearranged products, namely dioxaphosphaz-1-enes and oxophosphazadienes, as shown by 270-MHz 1H n.m.r. spectroscopy.The non-geminal derivative N3P3(NMe2)2(OMe)4 gives only the fully rearranged product N3Me3P3(NMe2)2O3(OMe), whose structure has been established from its 1H and 31P n.m.r. spectra.
- Dhathathreyan, K. S.,Krishnamurthy, S. S.,Murthy, A. R. Vasudeva,Shaw, Robert A.,Woods, Michael
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- Phosphazene compound, composite containing phosphazene compound, flame retardant containing composite and application
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The invention relates to a phosphazene compound, a composite containing the phosphazene compound, a flame retardant containing the composite and application. The crystal form of the cyclotriphosphazene derivative flame retardant synthesized by using the method is most stable, and the cyclotriphosphazene derivative flame retardant is high in heat stability and high in flame retardant efficiency; moreover, when the crystal type cyclotriphosphazene derivative flame retardant synthesized by using the method is added into a material, such as engineering plastics, general-purpose plastics, a lithiumion battery electrolyte, a flame retardant fabric and flame retardant paper, a high flame retardant performance is achieved, the crystal form is stable, the flame retardant is resistant to drip, onlyan extremely small adding amount is needed, the flame retardant performance of the material can reach the V-0 standards, and other properties of the material are little affected.
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Paragraph 0344-0345; 0348; 0352
(2019/01/23)
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