Flash Communication: Synthesis, Structural Characterization, and Reactivity of a Selenazolidine and a 1,3-Tetrahydroselenazine that Bear a Pentafluorophenyl Substituent

The synthesis, structural characterization in the solid state, and reactivity of a selenazolidine and a six-membered-ring derivative, i.e., a 1,3-tetrahydroselenazine, that contain a C6F5 substituent are reported. The first crystallographic characterization of a 1,3-tetrahydroselenazine was accomplished by means of single-crystal X-ray diffraction analysis. Despite the structural analogy to C6F5-substituted imidazolidines, these selenium-containing heterocycles exhibit pronounced thermal stability and high resistance toward the formation of the corresponding (amino)­(seleno)­carbenes, highlighting fundamentally different reactivity patterns between imidazolidines and selenazolidines.

本文报道了一种含五氟苯基（C6F5）取代基的硒唑烷（selenazolidine）及六元环衍生物（即1,3-四氢硒嗪（1,3-tetrahydroselenazine））的合成、固态结构表征与反应性。本研究首次通过单晶X射线衍射分析（single-crystal X-ray diffraction analysis）完成了1,3-四氢硒嗪的晶体结构表征。尽管这类含硒杂环与五氟苯基取代的咪唑烷（imidazolidines）结构相似，但它们展现出显著的热稳定性，且对生成对应（氨基）（硒代）卡宾（(amino)­(seleno)­carbenes）的反应具有高抗性，这凸显出咪唑烷与硒唑烷之间反应模式的本质差异。