作者:M. Mintas、A. Mannschreck、L. Klasinc
DOI:10.1016/s0040-4020(01)97652-5
日期:1981.1
Preparative separations or enrichments of enantiomers of diaziridines 1, 2, and 5 were achieved by liquid chromatography on triacetylcellulose, (+)-1 and (+)-2 being isolated almost pure (Table 1). Enantiomeric purities were determined by 1H NMR in the presence of the optically active auxiliary compound (+)-Eu(hfbc)3. The barriers to nitrogen inversion in 1 and 4 were determined and its lower limit
制备分离或二氮丙啶的对映异构体的富集1,2,和5 -通过在三乙酰纤维素液相色谱法,(+)达到1和(+) - 2中分离几乎是纯的(表1)。在光学活性辅助化合物(+)-Eu(hfbc)3存在下,通过1 H NMR测定对映体纯度。确定了1和4中氮转化的障碍,并估计了其在未取代氮二氮丙啶3中的下限。