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[摘要]：The synthesis, properties and structures of heterocyclic molecules containing phosphorus and nitrogen are described in this review. A systematic synthesis of a ring compound needs one or more bifunctional starting molecules that react in a special way to form new bonds and to obtain the ring. Oligomers or polymers can be obtained besides other products resulting from leaving groups necessary to form the new bonds. Hydrazine for example is one of the simplest bifunctional compounds that must be able to introduce two vicinal nitrogen atoms into a cycle, as it will be shown further. |
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