(2R)-3-[(4S)-4-Benzyl-2-oxo-3-oxazolidinyl]-3-oxo-2-[(1R,2S)-2-vinylcyclohexyl]propionic Acid Methyl Ester and (2R)-3-[(4S)-4-Benzyl-2-oxo-3-oxazolidinyl]-3-oxo-2-[(1R,2S)-2-vinylcyclopentyl]propionic Acid Methyl Ester

Both the title structures, C₂₂H₂₇NO₅ and C₂₁H₂₅NO₅, exhibit similar conformations, as shown by a least-squares fit of the atoms common to both. The oxazolidine ring is intermediate between envelope and twist forms, with a slight dominance of the envelope in the former but the twist in the latter. Part of the oxazolidine ring of the former, however, shows high displacement parameters.

-1