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Abstract
The low-temperature reaction of (E)-1,2-dimesityl-1,2-di-tert-butyldisilene (1a) with dioxygen gives (E)-1,2-dimesityl-1,2-di-tert-butyldisiladioxetane (2a), the structure of which has been established by X-ray crystallographic analysis. This result establishes that both oxidation of 1a and rearrangement of 2a to 1,3-cyclodisiloxane 4a take place with retention of configuration at silicon. Disiladioxetane 2a forms monoclinic crystals, space group C2/c. extra electron density found above and below the Si-Si bond was shown by 1 H and solid-state 29 Si NMR to be due to 4a, arising from rearrangement of 2a in the solid. X-ray crystal structures were determined for crystals that were 5.6%, 15.2%, and 20.3% rearranged
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