名称:
R2GeSnR‘2 and RR‘GeSnRR‘ (R = SiMetBu2, R‘ = 2,4,6-iPr3C6H2): The New Stable Germastannenes
摘要:
1,1-Bis(di-tert-butylmethylsilyl)-2,2-bis(2,4,6-triisopropylphenyl)-1-germa-2-stannaethene (2), containing a >Ge = Sn < double bond, was prepared as highly air- and moisture-sensitive deep violet crystals by the coupling reaction of bis(di-tert-butylmethylsilyl)dilithiogermane with dichlorobis(2,4,6-triisopropylphenyl)stannane in THF. The germastarmene 2 easily undergoes thermal isomerization to form the corresponding symmetrically substituted isomer (E)-1,2-bis(di-tert-butylmethylsilyl)-1,2-bis(2,4,6-triisopropylphenyl)-1-germa-2-stannaethene (3) by the dyotropic 1,2-shifts of the silyl and aryl substituents.