Palladium(II) cage compounds based on diphenylglycoluril
作者:Frank G. M. Niele、Roeland J. M. Nolte
DOI:10.1021/ja00209a027
日期:1988.1
formula [Pd(Lig)]Cl2. This complex has a cage structure that is unstable and collapses. The collapsed structure has either a left or a right twisted conformation. These conformations intcrconvert rapidly, the activation free energy of the process being 30 ± 2 kJ-mol“1. Ligands without oxygen atoms or only one oxygen atom per arm react with Pd(CH3C N )2Cl2 to afford cage complexes with the molecular formula
四臂四-l-咪唑基配体(Lig)配备二苯基甘脲(四氢-3a,6a-二苯基咪唑并[4,5-<7]咪唑-2,5(l//,3//)的凹面骨架-dione) 已被设计用于构建一个宿主,该宿主在空腔中或空腔附近包含一个潜在的催化活性金属中心。Lig (arm = CH 2(OCH2C H 2)2Im) 与 Pd(CH3C N )2Cl2 的反应导致形成具有通式 [Pd(Lig)]Cl2 的络合物。这个综合体有一个不稳定和坍塌的笼子结构。折叠结构具有左或右扭曲构象。这些构象迅速转换,该过程的活化自由能为 30 ± 2 kJ-mol“1。没有氧原子或每臂只有一个氧原子的配体与 Pd(CH3C N )2Cl2 反应生成具有分子式 [Pd(Lig)Cl]Cl 的笼络合物。这些复合体的笼子不会倒塌。咪唑基和氯离子以这样一种方式参与加扰过程,即在任何时候 Pd2+ 离子都被三个咪唑基和一个氯离子包围。提供的数据表明分子内
Synthesis of perfluoro-(1,1-dimethylbutyl)methyl ethers by vic-oxymethylfluorination of perfluoro-2-methyl-2-pentene with chloromethyl ethers
Perfluoro-2-methyl-2-pentene was successfully converted to perfluoro-(1,1-dimethylbutyl)methylethers by vic-oxymethylfluorination with chloromethylethers in the presence of KF in aprotic polar solvents such as N,N-dimethylformamide and N-methylpyrrolidone. By the addition of a catalytic amount of quaternary ammonium salt, the reaction was accelerated and the yield of product greatly increased.