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is rather open at 142.5°. By contrast, the C-O distance in a typical dialkyl ether is much shorter at 1.414(2) Å with a more acute C-O-C angle of 111°. It can be appreciated that the siloxanes would have low barriers for rotation about the Si-O bonds as a consequence of low steric hindrance. This geometric consideration is the basis of the useful properties of some siloxane-containing materials, such as their low glass transition temperatures.

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