有机膦溴化钯(Ⅱ)配合物的合成、结构及其催化偶联反应活性
Synthesis, Structure and Catalytic Activity of Three Organophosphine Bromo Palladium(Ⅱ) Complexes for Coupling Reactions
作者单位E-mail
巨少英 昆明贵金属研究所, 稀贵金属综合利用新技术国家重点实验室, 昆明 650106  
李雪 昆明贵金属研究所, 稀贵金属综合利用新技术国家重点实验室, 昆明 650106  
高安丽 昆明贵金属研究所, 稀贵金属综合利用新技术国家重点实验室, 昆明 650106  
姜婧 昆明贵金属研究所, 稀贵金属综合利用新技术国家重点实验室, 昆明 650106  
余娟 昆明贵金属研究所, 稀贵金属综合利用新技术国家重点实验室, 昆明 650106 liuweiping1963@126.com 
刘伟平 昆明贵金属研究所, 稀贵金属综合利用新技术国家重点实验室, 昆明 650106 juanyu1210@126.com 
摘要: 以PdBr2为起始原料,分别选择二叔丁基苯基膦((t-Bu)2PPh)、二叔丁基-(4-二甲基氨基苯基)膦(Amphos)、4,5-双二苯基膦-9,9-二甲基氧杂蒽(Xantphos)为有机膦配体,通过溶剂的配位加成和有机膦的配位取代,合成出3种溴化钯配合物,以寻找性能更佳的偶联催化剂。借助元素分析仪、核磁共振仪及单晶X射线衍射仪测试和解析了它们的化学结构,分别为trans-Pd((t-Bu)2PPh)2Br21)、trans-[Pd(Amphos)Br2]22)、cis-Pd(Xantphos)Br23),其中的trans-[Pd(Amphos)Br2]22)为溴桥双核钯配合物。选用了2个Suzuki偶联反应为评价模型,测试了它们的催化活性,并分别与市售的Pd((t-Bu)2PPh)2Cl2、Pd(Amphos)2Cl2、Pd(Xantphos)Cl2进行对照试验,结果表明:在选定的模型上,2个有机膦钯(Ⅱ)配合物的产率均高于对应的有机膦氯化钯(Ⅱ)催化剂。
关键词: 有机膦配体  溴配体  钯Pd(Ⅱ)配合物  结构  催化活性
基金项目: 国家自然科学基金(No.21661018)和云南省自然科学基金(No.2018DC005)资助。
Abstract: Three new palladium(Ⅱ) complexes with Br- as the dissociation ligand and with di-tert-butylphenyl phosphine((t-Bu)2PPh), di-tert-butyl-(4-dimethylaminophenyl)phosphine (Amphos) or 4,5-bis(diphenyl-phosphino)-9,9-dimethylxanthene (Xantphos) as the organic phosphine ligand, were prepared from the starting material PdBr2 via the coordination addition and ligand substitution process, with an attempt to develop more effective organophosphinopalladium catalysts for the coupling reactions. The palladium (Ⅱ) complexes were tested and characterized by elemental analysis, 1H NMR and single-crystal X-ray diffraction analysis to be trans-Pd((t-Bu)2PPh)2Br2 (1), trans-[Pd(Amphos)Br2]2 (2), cis-Pd(Xantphos)Br2 (3). Among them, trans-[Pd(Amphos)Br2]2 is a unique binuclear palladium complex in which two bromine ions act as the bridging ligand bringing two[Pd(Amphos)Br] blocks together. Two typical Suzuki organic coupling reaction models were used for evaluating the catalytic activity of three complexes along with commercially available Pd((t-Bu)2PPh)2Cl2, Pd(Amphos)2Cl2 and Pd(Xantphos)Cl2 as comparison catalysts. The results showed all three complexes displayed high catalytic activity in two selected typical Suzuki organic coupling reactions, greater than the corresponding values of Pd((t-Bu)2PPh)2Cl2, Pd(Amphos)2Cl2 and Pd(Xantphos)Cl2.
Keywords: organophosphine ligand  bromine ligand  palladium(Ⅱ) complex  structure  catalytic activity
投稿时间:2020-09-01 修订日期:2021-03-23
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巨少英,李雪,高安丽,姜婧,余娟,刘伟平.有机膦溴化钯(Ⅱ)配合物的合成、结构及其催化偶联反应活性[J].无机化学学报,2021,37(5):785-790.
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