Roy Tamal, Kureshy Rukhsana I, Khan Noor-Ul H, Abdi Sayed H R, Bajaj Hari C
Discipline of Inorganic Materials and Catalysis, Central Salt and Marine Chemicals Research Institute (CSMCRI), Bhavnagar, Gujarat 364 021 (India), Fax: (+91) 0278-2566970.
Academy of Scientific and Innovative Research (AcSIR), Central Salt and Marine Chemicals Research Institute (CSMCRI), Council of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar, Gujarat 364 021 (India).
Chempluschem. 2015 Jun;80(6):1038-1044. doi: 10.1002/cplu.201402460. Epub 2015 Apr 2.
A series of self-supported chiral polymeric Mn N,N'-ethylenebis(salicylimine) (salen) complexes were synthesized through metalation of the corresponding salen ligands obtained by condensation of several bis/tris-aldehydes with (1R,2R)-1,2-diaminocyclohexane. Upon employment in the asymmetric epoxidation reaction of nonfunctionalized olefins, all complexes showed enhanced activity and enantioselectivity relative to the classical Jacobsen's monomeric salen complex. However, 1,3,5-triazole-based polymeric Mn salen complex 7 was noticeably preferred over others owing to its ability to render higher enantioselectivity at the expense of lower catalyst loading. Furthermore, complex 7 was recycled and reused in eight recycling experiments with marginal loss in catalytic activity.
通过将几种双/三醛与(1R,2R)-1,2-二氨基环己烷缩合得到相应的双水杨醛缩乙二胺(salen)配体进行金属化反应，合成了一系列自支撑手性聚合物锰双水杨醛缩乙二胺(salen)配合物。在用于非官能化烯烃的不对称环氧化反应时，相对于经典的雅各布森单体salen配合物，所有配合物均表现出增强的活性和对映选择性。然而，基于1,3,5-三唑的聚合物锰salen配合物7明显优于其他配合物，因为它能够以较低的催化剂负载量为代价实现更高的对映选择性。此外，配合物7在八次循环实验中被回收再利用，催化活性仅有少量损失。
