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作 者:靳晓娟 左川 韩旭 冯洋洋 高安丽[1] 余娟[1] 刘伟平[1]
机构地区:[1]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,云南昆明650106 [2]贵研铂业股份有限公司,云南昆明650106
出 处:《昆明理工大学学报(自然科学版)》2017年第6期86-91,共6页Journal of Kunming University of Science and Technology(Natural Science)
基 金:国家科技支撑计划项目(2012BAE06B08);云南省科技人才计划项目(2015HC022)
摘 要:以氯亚钯酸钠、1,1-双(二叔丁基膦)二茂铁为起始原料,通过配位取代反应合成了新型的C-C偶联催化剂—1,1-双(二叔丁基膦)二茂铁二氯化钯(Ⅱ).经过一系列的探究实验,对合成工艺进行改进及优化,最终确定该化合物的合成条件:氩气保护下,向1,1-双(二叔丁基膦)二茂铁的四氢呋喃溶液中滴加等摩尔量的氯亚钯酸钠水溶液,回流反应2 h,以氯亚钯酸钠为基准计算化合物1,1-双(二叔丁基膦)二茂铁二氯化钯(Ⅱ)产率可达95%.为了更加深入地了解该催化剂的化学结构、性质,分别采用核磁共振(1H NMR)、质谱(MS)、单晶X-射线衍射(XRD)对化合物进行了表征.1,1-双(二叔丁基膦)二茂铁二氯化钯(Ⅱ)的核磁共振氢谱显示,化合物环戊二烯环和甲基上的氢核信号的化学位移、峰面积,分别与目标化合物的氢核信息相匹配;质谱测定该化合物分子量为650.5;单晶X-射线衍射确定其晶体为单斜晶系,由于空间位阻效应,P-Pd-P平面与Cl-Pd-Cl平面有一夹角为29.401°,两个环戊二烯环平面形成一狭小的夹角θ=2.179°,并呈交错构象.With sodium tetrachloropalladate (II) and 1,1 - bis ( di - tert - butylphosphino) ferrocene as the starting materials, [ 1,1 - bis ( di - tert - butylphosphino) ferrocene ] palladium (II) dichloride, a new type of C - C cou- pling catalysts, was synthesized via ligand substitution reaction. After a series of exploratory experiments to impro- ving and optimizing the synthesis process, the synthesis conditions of the compound were finally determined: add dropwise equal molar ratio of aqueous sodium tetrachloropalladate (II) solution to the solution of 1,1 - bis ( di - tert - butylphosphine) ferrocene under Ar, reflux reaction 2 h. The yield of [ 1,1 - bis ( di - tert - butylphosphino) ferroeene ] palladium(II) dichloride was up to 95% based on sodium tetrachloropalladate (II). The resulting compound was characterized by different techniques including ^1H NMR, mass spectra (MS) and single crystal X -ray diffraction analysis (XRD) for more in -depth understanding of the chemical structure and properties of the catalyst. The 1H NMR spectra of [ 1,1 - his ( di - tert - butylphosphino) ferrocene ] palladium (II) dichloride revealed that the chemical shifts and peak area of hydrogen nucleus signals on the Cp tings and the methyl groups correctly match to the target compound hydrogen nucleus information, respectively. The molecular weight was determined to be 650.5 by MS measurement. XRD pattern results showed that the crystal form of the compound belongs to mono- clinic. Because of the steric effect, angle 0 of the P - Pd - P plane and the C1 - Pd - Cl plane is 29. 401°. The two cyclopentadienyl ring planes have a staggered conformation with a small intersection angle 8 of 2. 179°.
关 键 词:1 1-双(二叔丁基膦)二茂铁二氯化钯 合成 化学结构 单晶
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