preparation and structural assignments of N-methyl-(S)- and -(R)-alaninatocobalt(III) complexes with a few chiral derivatives of 2,3,2-tet (=3,7-diazanonane-1,9-diamine) and triethylenetetramine are described. The hydroxide ion-catalyzed epimerizations of these complexes are examined at pH 10. In the N-methylalaninato complexes the isomer ratio for Λ-S/Λ-R ranged from 76/24 to 90/10. In the most favorable
N-甲基-(S)-和-(R)-丙
氨酸
钴(III)配合物与一些2,3,2-tet (=3,7-diazanonane-1,9-)手性衍
生物的制备和结构分配二胺)和
三亚乙基四胺。在 pH 10 下检查这些复合物的氢氧根离子催化差向异构化。在 N-甲基丙
氨酸盐复合物中,Λ-S/Λ-R 的异构体比为 76/24 至 90/10。在最有利的情况下,四胺是 2(S)10(S)-4,8-二氮杂
癸烷-2,10-二胺(缩写为 2(S)10(S)-Me2-2,3,2-tet)四种可能的非对映异构体之间的能量差异与应变能最小化计算的预测有关。