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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Lanthanide derivatives comprising arylhydrazones of beta-diketones: cooperative E/Z isomerization and catalytic activity in nitroaldol reaction
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Lanthanide derivatives comprising arylhydrazones of beta-diketones: cooperative E/Z isomerization and catalytic activity in nitroaldol reaction

机译：包含β-二酮芳基hydr的镧系元素衍生物：硝基苯醇反应中的协同E / Z异构化和催化活性

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摘要

Two complexes [KLa(HL1)(2){(CH3)(2)NCHO}(2)(H2O)(3)] (1) and [Sm(H2O)(9)](E-H2L2)(3)center dot 2H(2)O (2) were synthesized by the reaction of lanthanum(III) and samarium(III) nitrates with potassium 3-(2-(2,4-dioxopentan-3-ylidene) hydrazinyl)-2-hydroxy-5-nitrobenzenesulfonate (KH2L1) and potassium (E, Z)-5-chloro-3-(2-(1,3-dioxo-1-phenylbutan-2-ylidene)hydrazinyl)-2-hydroxybenzenesulfonate (KH2L2), respectively. Both complexes were fully characterized by elemental analysis, IR, H-1 and C-13 NMR spectroscopy, ESI-MS and single-crystal X-ray diffraction. Cooperative E, Z. E isomerization of KH2L2, induced by resonance assisted hydrogen bonding and ionic interactions, occurs upon the interaction with Sm(III). Catalytic activities of KH2L1,2 and their lanthanide derivatives were evaluated in the Henry reaction of nitroethane with a variety of aromatic and aliphatic aldehydes. Good yields (up to 91%) and diastereoselectivities (syn/anti 3 : 1) were observed in the reactions catalyzed by 1 in water.
机译：两个复合物[KLa（HL1）（2）{（CH3）（2）NCHO}（2）（H2O）（3）]（1）和[Sm（H2O）（9）]（E-H2L2）（3）中心点2H（2）O（2）通过镧（III）和硝酸sa（III）与3-（2-（2,4-二氧戊open-3-亚甲基）肼基）-2-羟基钾的反应合成-5-硝基苯磺酸盐（KH2L1）和（E，Z）-5-氯-3-（2-（1,3-二氧代-1-苯基丁烷-2-亚甲基）肼基）-2-羟基苯磺酸钾（KH2L2） 。两种配合物均通过元素分析，IR，H-1和C-13 NMR光谱，ESI-MS和单晶X射线衍射充分表征。共振辅助氢键和离子相互作用诱导的KH2L2的合作E，Z.E异构化发生在与Sm（III）相互作用时。在硝基乙烷与各种芳香族和脂肪族醛的亨利反应中评估了KH2L1,2及其镧系元素衍生物的催化活性。在水中以1催化的反应中，观察到良好的收率（高达91％）和非对映选择性（顺/反3：1）。

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