Carborane-containing stereoregular cyclic phenylsiloxanes: synthesis, structure and properties†
E. O.
Minyaylo, 
ab
A. A.
Anisimov,
abc
A. V.
Zaitsev,
a
V. A.
Ol'shevskaya,
a
O. I.
Shchegolikhina
a
and
ab
A. A.
Anisimov,
abc
A. V.
Zaitsev,
a
V. A.
Ol'shevskaya,
a
O. I.
Shchegolikhina
a
and
Abstract
The synthesis of novel stereoregular carborane-containing phenylcyclosiloxanes (4, 5, 6, 8, and 12 –SiO– units in the ring) has been developed. The structures of all compounds were confirmed by a series of physicochemical methods. Tris-cis–tris-trans-dodeca[phenyl(1(3-(9-m-carboranyl)propyl)dimethylsiloxy)]cyclododecasiloxane has been studied by NMR spectroscopy and it was found that such a configuration of the ring makes two methyl groups diastereotopic, resulting in magnetic non-equivalence of the protons of these groups. The results of thermal studies of the obtained compounds are also described.
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