A. Sekiguchi et al., PERSILYLATED DIMETHYLENECYCLOBUTENE DIANION DILITHIUM AS THE FIRST 6C-8-PI ALLYL ANION SYSTEM, Chemistry Letters, (12), 1996, pp. 1133-1134
Reduction of persilylated dimethylenecyclobutene with lithium metal in
1,2-dimethoxyethane yields green crystals of persilylated dimethylene
cyclobutene dianion dilithium as the first 6C-8 pi allyl anion system.
The molecular structure, determined by X-ray crystallography, is disc
ussed in comparison to that of the neutral starting molecule.