serve as the model for mimicking reactivities exhibited by cytochrome P450 hydroxylase. Recent developments on selective C–H halogenation using Mn-porphyrins provided the way for understanding the reactivity as well as mechanism of different halogenase enzymes. In this report, we demonstrated a method for benzylic C–H chlorination using easily prepared Mn(salen) complex as the catalyst, which shows a complementary
Salen Mn(iii) immobilized onto ZnPS-PVPA modified by 1,2,3-triazole as efficient and reusable catalysts for asymmetric epoxidation of olefins
作者:JiaLi Cai、Jing Huang、Chang Ming Li、Hao Feng、ZhiGuo Liu
DOI:10.1039/c3ra42076k
日期:——
series of novel types of chiralsalenMn(III) anchored onto ZnPS-PVPA containing 1,2,3-triazole were synthesized by means of click chemistry. These supported catalysts were highly active and enantioselective (conversion up to 99%; ee up to 99%) in the asymmetricepoxidation of unfunctionalized olefins and were selective for the oxidants. Moreover, these heterogeneous catalysts could still show good catalytic
Asymmetric epoxidation of unfunctionalized olefins catalyzed by chiral salen‐Mn (III) immobilized on alkoxyl‐modified ZnPS‐PVPA
作者:Jing Huang、Junjie Xie、Jiali Cai
DOI:10.1002/aoc.4982
日期:2019.8
Novel layered heterogeneous chiral salenMn (III) catalysts anchored onto ZnPS‐PVPA by means of click chemistry are synthesized and employed in asymmetricepoxidations of unfunctionalized olefins. The catalysts manifest superior catalytic performances (conv%, up to >99; ee%, up to >99) according to the epoxidations of α‐methylstyrene, styrene, indene and 1‐octene. But for 6‐cyano‐ 2,2‐dimethylchromene
合成了通过点击化学方法锚定在ZnPS-PVPA上的新型层状非均相手性Salen Mn(III)催化剂,并将其用于未官能化烯烃的不对称环氧化。根据α-甲基苯乙烯,苯乙烯,茚和1-辛烯的环氧化,该催化剂表现出优异的催化性能(转化率,最高> 99; ee%,最高> 99)。但是对于6-氰基-2-2,2-二甲基苯甲基和6-硝基-2-2,2-二甲基苯甲基,环氧化物的构型是相反的。此外,催化剂经过九次循环使用后仍可显示出可比的性能(收率82%; ee 86%),并且在大规模反应中具有出色的功能,为工业应用铺平了道路。
Novel bis-Salen Mn(III) chiral complexes of rigid structure axially coordinated with bis-diphenolate and bis-diamine for epoxidation of unfunctionalized olefins
作者:Xuemei Huang、Xiangkai Fu、Xiaoju Wu、Ziyong Jia
DOI:10.1016/j.tetlet.2013.05.087
日期:2013.7
series of bis-Salen Mn(III) chiral complexes of rigid structure axially coordinated with bis-diphenolate and bis-diamine ligands were synthesized and their catalytic performances in asymmetricepoxidation of indene and α-methylstyrene were investigated in detail. Compared with Jacobsen’s catalyst and the corresponding monomer salen Mn(III) catalyst, bis-Salen Mn complex showed higher activity and enantioselectivity
1H NMR and EPR spectroscopic monitoring of the reactive intermediates of (Salen)MnIII catalyzed olefin epoxidation
作者:Konstantin P. Bryliakov、Dmitrii E. Babushkin、Evgenii P. Talsi
DOI:10.1016/s1381-1169(00)00040-6
日期:2000.9
Using 1H NMR and EPR spectroscopy, manganese species formed in the catalytic systems 1+iodosobenzene (PhIO) and 1+meta-chloroperoxybenzoic acid (m-CPBA), where 1 is (R,R)-(−)-N,N′-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamino-manganese(III) chloride ([(Salen)MnIII]) were studied. Three types of manganese complexes were characterized in the catalytic system 1+PhIO (4–6). Complex 4 is very
使用1 H NMR和EPR光谱,在催化体系1 +碘代苯(PhIO)和1 +间氯过氧苯甲酸(m -CPBA)中形成了锰物种,其中1是(R,R)-(-)- N,N研究了′-双(3,5-二叔丁基水杨基亚胺基)-1,2-环己烷二氨基锰(III)氯化物([(Salen)Mn III ])。三种类型的锰配合物的表征在催化系统1 + PhIO(4 - 6)。复杂4α是非常不稳定的并且在-20℃下与苯乙烯反应以提供氧化苯乙烯。它在1.68、1.64和1.42 ppm处显示出t Bu基团的三个信号。这种模式非常类似于一个模型配合物[(萨伦)的Mn V ≡N]。根据这些数据,将4鉴定为d 2低自旋氧锰(V)络合物[(Salen)Mn V = O] +。配合物5和6在-20℃下相对稳定,并且在该温度下对苯乙烯的反应性差。它们显示出反铁磁耦合的μ-氧-核-Mn Mn IV物种的1 H NMR光谱特征,并被鉴定为双核络合物[(Salen)LMnIV