Synthesis and structure of a hexacoordinate carbon compound

J Am Chem Soc. 2008 Jun 4;130(22):6894-5. doi: 10.1021/ja710423d. Epub 2008 May 7.

Abstract

In an exploration of six coordination and hypervalence in carbon compounds, steric constraints have been employed to bring four ether O atoms in close proximity to an allenic carbon atom. The dimethylated dication 2 is confirmed to have hexacoordinate carbon by experimental charge density analysis and DFT calculations and is arguably hypervalent.