Hexachlorocyclotriphosphazene (HCCP) is a very old compound, and used as a starring material of a variety of cyclotriphosphazene derivatives. Some of them have unique properties, and have been used in not only frame retardants but also functional materials and biomaterials. To develop cyclotriphosphazene derivatives having a desired function, numbers of substituents, regio-, and stereochemistry should be controlled in the reaction between HCCP and nucleophiles. In this review, selectivity in the reaction between HCCP and nucleophiles as well as application of the cyclotriphosphazene derivatives are summarized.

中文翻译：

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功能化环三磷腈核基材料的新实用应用

六氯环三磷腈（HCCP）是一种非常古老的化合物，用作各种环三磷腈衍生物的主星材料。它们中的一些具有独特的性能，不仅已用于框架阻燃剂，而且还用于功能材料和生物材料。为了开发具有所需功能的环三磷腈衍生物，应在HCCP和亲核试剂之间的反应中控制取代基的数目，区域和立体化学。在这篇综述中，总结了HCCP和亲核试剂之间反应的选择性以及环三磷腈衍生物的应用。