HALF-SANDWICH, 'CARBONS APART' MAGNESACARBORANE OF A C2B4-CAGE SYSTEM: SYNTHETIC AND STRUCTURAL INVESTIGATION

摘要

A new half-sandwich carbons apartmagnesacarborane, closo-1-Mg(THF)3-2, 4-(SiMe3)2-2, 4-C2B4H4 (1), was synthesized in 89% yield from the reaction ofMeMgBr with the corresponding sodium complexed mono-anionic carborane precursor, nido-1-Na(THF)2-2, 4-(SiMe3)2-2,4- C2B4H5, in THF. The single crystal X-ray diffraction analysisof 1 showed it to be a closed polyhedron in which a THF-solvated Mg occupies the apical position above the bonding faceof the carborane cage.