Synthesis and structure of an air-stable binuclear complex of bis(ethylcyclopentadienyl)zirconium perfluorooctanesulfonate and its catalytic application in one-pot three-component aza-Friedel–Crafts reactions
An air-stableLewisacidic binuclear complex of bis(ethylcyclopentadienyl)zirconium perfluorooctanesulfonate (1a) was successfully synthesized by the reaction of (CH3CH2Cp)2ZrCl2 with C8F17SO3Ag. The complex 1a was characterized by different techniques and found to have the nature of air-stability, water tolerance, thermal-stability, and strong Lewis-acidity. In addition, its solubility was higher
通过(CH 3 CH 2 Cp)2 ZrCl 2与C 8 F 17 SO 3 Ag的反应成功地合成了双(乙基环戊二烯基)锆全氟辛烷磺酸(1a)的空气稳定的路易斯酸性双核配合物。复数1a用不同的技术对其进行表征,发现具有空气稳定性,耐水性,热稳定性和强路易斯酸度的性质。此外,它的溶解度高于我们先前报道的单核锆茂双(全氟辛烷磺酸盐)的溶解度。这种复合物在吲哚与醛和N,N-二甲基苯胺的一锅三组分氮杂-Friedel-Crafts反应中显示出高催化效率,良好的可回收性和可重复使用性。相应的3-二芳基甲基吲哚的产率高于传统的路易斯酸性催化剂的产率。
Air-stable μ2-hydroxyl bridged cationic binuclear complexes of zirconocene perfluorooctanesulfonates: their structures, characterization and application
binuclear structures: (i) [CpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·2THF·4H2O (1a·2THF·4H2O), (ii) [n-BuCpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·6H2O (2a·6H2O), and (iii) [t-BuCpZr(OH2)3]2(μ2-OH)2(OSO2C8F17)4·2C3H6O·8H2O (3a·2C3H6O·8H2O). The ligands of water and organic molecules in the complexes originated from the moist air and solvent during their recrystallization. These complexes were characterized with different