超原子価5配位及び6配位炭素・ホウ素化合物の合成とその後の展開

抄録

Synthesis and structure of hypervalent pentacoordinate carbon and boron compounds bearing a rigid anthracene skeleton and a relatively flexible van Koten skeleton, and synthesis of a novel tridentate ligand bearing a benzene ring condensed with two seven membered rings and its application for the synthesis of pentacoordinate carbon compounds will be discussed. Hypervalent hexacoordinate carbon compounds have never been reported except for the observation of CLi₆ in Knudsen-effusion mass spectrometry. Although calculation and synthesis of eight valence electron compounds such as CH₆²⁺ and (Ph₃PAu)₆C²⁺ has been reported, these are not classified as electron rich 12 electron hypervalent compounds. Here we discuss recently synthesized hypervalent hexacoordinate carbon compounds based on the X-ray structure.