Bridge derivatives of CC′-dimethyl-4,5-dicarba-nido-hexaborane(8)

Abstract

Compounds having the general formula Me₃M_IVC₂Me₂B₄H₅(M_IV= Si or Ge), Me₂BC₂Me₂B₄H₅, and Me₂ClSiC₂-Me₂B₄H₅ have been prepared by the reaction of the C₂Me₂B₄H₅(1–) ion with Me₃SiCl, Me₃GeBr, Me₂BCl, and Me₂SiCl₂ respectively. Spectral evidence suggests that the Si, Ge, and B atoms are bonded to two adjacent basal boron atoms in a three-centre bond. Of the four bridge compounds prepared only Me₃GeC₂Me₂B₄H₅ isomerises to the terminal isomer.