X-ray diffraction examination of o-carboranes with tert-butyl and trimethylsilyl substituents

Conclusions By a complete x-ray diffraction examination of 1-tert-butyl-o-carborane (I) and 1-trimethylsilyl-2-methyl-o-carborane (II), it was found that the bonds between the substituants and the icosahedral skeleton are elongated. The tert-butyl substituent in (I) has a screened orientation with respect to the nearest pentagonal fragment, and the trimethylsilyl substituent in (II), a screened orientation with respect to the boron atoms.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2481–2487, November, 1979.