The stereochemistry of 4,8‐dimethyl‐6‐phenyl‐5,6,7,8‐tetrahydro‐4H‐1,3,6‐dioxazocin‐2‐ones using NMR

Two isomeric 4,8‐dimethyl‐6‐phenyl‐5,6,7,8‐tetrahydro‐4H‐1,3,6‐dioxazocin‐2‐ones were prepared, and their pmr and cmr spectra were examined. From the tris(dipivaloylmethanato) europium (Eu(dpm)3) shift reagent and the dihedral angle, the title compounds are found to exist in the eq‐ax and eq‐eq methyl groups with boat‐chair form.