Optimization of the Efficiency of Oxidation Catalysts Based on Iron Bispidine Complexes
作者:Peter Comba、Hubert Wadepohl、Sebastian Wiesner
DOI:10.1002/ejic.201100212
日期:2011.6
High-valent bispidine iron-oxo complexes are among the most efficient nonheme iron oxidation catalysts. Here, we report the synthesis and structural analysis of two derivatives of the known pentadentate bispidine ligand L1 L1 = 2,4-pyridyl-7-(pyridine-2-ylmethyl)-3,7-diazabicyclo[3.3.1]nonane}: L2 and L3 L2 = 2,4-pyridyl-7-[1-(pyridine-2-yl)ethyl]-3,7-diazabicyclo[3.3.1]nonane; L3 = 2,4-pyridyl-
高价双吡啶铁氧配合物是最有效的非血红素铁氧化催化剂之一。在这里,我们报告了已知五齿双吡啶配体 L1 L1 = 2,4-pyridyl-7-(pyridine-2-ylmethyl)-3,7-diazabicyclo[3.3.1]nonane} 的两种衍生物的合成和结构分析: L2 和 L3 L2 = 2,4-吡啶基-7-[1-(吡啶-2-基)乙基]-3,7-二氮杂双环[3.3.1]壬烷;L3 = 2,4-吡啶基-7-[苯基(吡啶-2-基)甲基]-3,7-二氮杂双环[3.3.1]壬烷}及其FeII配合物。环辛烯和苯乙烯以碘代苯为氧化剂的催化环氧化的产率从L1-到L2-再到L3-基催化剂(例如,在厌氧条件下,以MeCN为溶剂的氧化苯乙烯的产率为40% , 90 %, 96 %),这与 FeIII/II 还原电位 [Fe(L1)(NCMe)]n+ (1.01 V) 相关,[Fe(L2)(NCMe)]n+