Figure 1. singlet at 6 1.18 (CDCl,) in the lH NMR spectrum for the angular methyl group. In order to verify the stereochemical assignment of this compound, a single-crystal X-ray structure determination was performed on its 2, 4-dinitrophenylhydrazone derivative. The molecular structure of this compound, as generated by ORTEP, is shown in Figure 1 with the 2, 4-dinitrophenylhydrazone group deleted.
