K. Wakita et al., AN UNEXPECTED ELIMINATION OF CYCLOPENTADIENIDE ANION IN THE REACTION OF SILACYCLOHEXADIENES WITH A BULKY ARYLLITHIUM, Chemistry Letters, (7), 1998, pp. 687-688
The reaction of silacyclohexadienes with an extremely hindered aryllit
hium, TbtLi (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl), gave
no expected Tbt-substituted silacyclohexadienes but trihydrosilane, Tb
tSiH(3), via the elimination of cyclopentadienide anion. By contrast,
1,1-difluoro-1-silacyclohexa-2,4-diene underwent a normal substitution
though the yield was very low.