A pentacoordinate germanium compound consisting of a spirocyclic dilactone-like structure was synthesized. Both radical and oxidation synthetic routes afforded the diphenylgermanium dicarboxylic acid compound. Then, mono-dearylation by acid treatment successfully delivered a hypercoordinate germane product. X-Ray crystallographic analysis revealed that the product adopted trigonal bipyramidal geometry in which a γ-lactone ring and a dative-bonding carboxylic acid moiety were incorporated.

中文翻译：

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具有A的五配位锗化合物的合成

合成了由螺环二内酯样结构组成的五配位锗化合物。自由基和氧化合成途径均提供二苯基锗二羧酸化合物。然后，通过酸处理的单脱芳烃成功地交付了高配位的锗烷产品。X射线晶体学分析表明该产物采用三角形双锥体的几何结构，其中掺入了γ-内酯环和键合羧酸的部分。