3-tert-Butyl-4-methyl-2-phenyl-3-(trimethylsilyloxy)oxetane and 2-(2-Benzyloxyphenyl)-3-tert-butyl-3-(trimethylsilyloxy)oxetane

In the structures of both of the title compounds, C₁₇H₂₈O₂Si (1), and C₂₃H₃₂O₃Si, (II), the bulkiest substituents are trans with respect to one another, i.e. the phenyl group (or substituted phenyl) is trans with respect to the tert-butyl group. In compound (I), the methyl group at ring-position 4 is in a trans configuration relative to the tert-butyl group. The oxetane rings in both structures, especially II, are non-planar. Both structures contain long C-O single bonds in the four-membered ring (1.44-1.46 Å), which is typical of oxetane structures.

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