Copper(II) Complexes of Aminocarbohydrateβ-Ketoenaminic Ligands: Efficient Catalysts in Catechol Oxidation
作者:Rainer Wegner、Michael Gottschaldt、Helmar Görls、Ernst-G. Jäger、Dieter Klemm
DOI:10.1002/1521-3765(20010518)7:10<2143::aid-chem2143>3.0.co;2-d
日期:2001.5.18
s(-1)) show moderate activity. All complexes with a peripheral ethoxycarbonyl group instead of the acetyl substituent R2, Cu(1b)-Cu(3b) and Cu(4c), are inactive. The complexes derived from 2-hydroxocyclohexylamine, Cu(5a) and Cu(5c), which were used as models of the active complex Cu(3a), have the typical "cubane-like" tetranuclear structure known from many copper complexes with derivatives of saturated
合成了源自不同功能化氨基-脱氧葡萄糖的三齿双阴离子 β-酮烯胺配体的铜 (II) 配合物,并对其结构、光谱和催化特性进行了表征。(可能是二聚体)络合物 [1,2-O-isopropidene-6-N-(3-acetyl-2-oxobut-3-enyl)amino-6-deoxyglucofuranoso)copper(II) Cu(3a)用于通过分子氧将 3,5-二叔丁基儿茶酚 (dtbc) 氧化为 3,5-二叔丁基醌 (dtbq) 的儿茶酚氧化酶样催化剂 (kcat=2.63s(-1))。与这种磁性“正常”复合物 Cu(3a) 不同,类似的双核复合物 [[Cu(2a)]2],源自异构氨基糖 5-amino-5-deoxyglucofuranose,与糖部分形成六元螯合环,并具有非常强的反铁磁耦合铜原子(导致抗磁基态)。它有一个相当微不足道的活动(kcat < 10(-3)s(-1))。配体