Abstract
The reaction between dodecamethylcyclohexasilane (Me 2Si) 6 1 and 9,10-phenanthraquinone 2 has been studied by means of CIDNP method. In the polar solvent, the photodecomposition of 1 is shown to proceed via triplet radical ion pair formed by phenanthraquinone radical anion and cyclohexasilane radical cation. Its transformation leads to the cyclic reaction product – 10-membered cyclic dioxahexasilecine 8 – formally resulting from the addition of linear 1,6-silicon-centered biradical Si(Me) 2–Si 4(Me 2) 4-(Me) 2Si to C O bonds of quinone. Product 8 is unstable, after several hours it converts to dioxasilole 4 via sequential repeated elimination of dimethylsilylenes 3.
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