TYL-4-METHYL-2-PHENYL-3-(TRIMETHYLSILYLOXY)OXETANE AND YPHENYL)-3-TERT-BUTYL-3-(TRIMETHYLSILYLOXY)OXETANE

In the structures of both of the title compounds, C17H28O2Si, (I), and C23H32O3Si, (II), the bulkiest substituents are trans with respect to one another, Le. the phenyl group (or substituted phenyl) is trans wi th 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-bu tyl 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 Angstrom), which is typical of oxetane struct ures.