Chemistry Letters, Vol.36, No.12, 1438-1439, 2007
Synthesis and structure of a carbon compound bearing a sterically rigid 1,8-dioxythioxanthylium (or thioxanthene) skeleton
In order to obtain a pentacoordinate hypervalent carbon compound with two strong apical bonds, a new compound bearing the novel skeleton 4 was synthesized by the two-electron oxidation of 9 followed by deprotonation. The X-ray diffraction data and the NMR spectra showed that the structure of 4 is not pentacoordinate, but tetracoordinate.