| Popis: |
The title compound was obtained in a four-step synthesis starting from (4-methoxyphenyl)silane. Owing to the presence of activating p-methoxy groups in the key intermediate hexakis[(4-methoxyphenyl)silyl]benzene (4), the peripheral aryl groups can be cleaved selectively from the silicon atoms with trifluoromethanesulfonic acid, leaving the Si–C bonds to the central benzene ring intact. LiAlH4 reduction of the resulting hexakis[(trifluoromethylsulfonyloxy)silyl]benzene (5) finally leads to crystalline, sublimable, air-stable C6(SiH3)6 (6), m.p. 165°C. In the crystals (triclinic, space group P&1macr;) the structure of the centrosymmetrical molecules approaches very closely point group D3d, as predicted from theoretical considerations. |
Plný text