ne derivative but an unexpected cyclization product, a stannacyclobutabenzene derivative, in contrast to thereactions of the corresponding dilithiosilane and dilithiogermane, Tbt(Dip)ELi2 (E = Si, Ge), with o-dibromobenzene leading to the formation of the corresponding metallacyclopropabenzenes as stable crystalline compounds. A preliminary result of the synthesis of a tin–tellurium double-bond compound
Syntheses, Structures and Properties of Kinetically Stabilized Distibenes and Dibismuthenes, Novel Doubly Bonded Systems between Heavier Group 15 Elements.
dibismuthene, BbtE=EBbt (E = Sb, Bi), with sufficiently high solubility were also synthesized using another bulky substituent, 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl group (Bbt). The crystallographic analysis and spectroscopic studies of these stable dipnictenes led to the systematic comparison of structural parameters and physical properties for all homonuclear doubly bonded
An Unexpected Elimination of Cyclopentadienide Anion in the Reaction of Silacyclohexadienes with a Bulky Aryllithium
作者:Keiji Wakita、Norihiro Tokitoh、Renji Okazaki
DOI:10.1246/cl.1998.687
日期:1998.7
The reaction of silacyclohexadienes with an extremely hindered aryllithium, TbtLi (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl), gave no expected Tbt-subsituted silacyclohexadienes but trihydrosilane, TbtSiH3, 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.