Organotin Perfluorooctanesulfonates as Air-Stable Lewis Acid Catalysts: Synthesis, Characterization, and Catalysis
作者:De Lie An、Zhihong Peng、Akihiro Orita、Akinobu Kurita、Sumiyo Man-e、Kei Ohkubo、Xingshu Li、Shunichi Fukuzumi、Junzo Otera
DOI:10.1002/chem.200501091
日期:2006.2.8
organic solvents. The ionic dissociation together with facile hydration probably causes the unusual solubility. The Lewis acidity of these compounds was found to be high among organotin derivatives on the basis of ESR spectra of superoxide/metal-ion complexes. In contrast to well-known organotin triflates, these compounds suffered no hydrolysis upon storage in open air. The high catalytic activity of the
1,3-二氯-1,1,3,3-四丁基二锡烷和二烷基锡二卤化物与全氟辛烷磺酸银的反应提供了相应的磺酸盐水合物。水合的水分子数(n)取决于条件。双锡氧烷衍生物的n值为0.5至6,而在水合单核物质和DMSO络合物中,n的范围为4至13。这些化合物在极性有机溶剂中显示出异常高的溶解度。离子离解和容易的水合作用可能会导致异常的溶解性。根据超氧化物/金属离子络合物的ESR光谱,发现这些化合物的路易斯酸度在有机锡衍生物中较高。与众所周知的有机锡三氟甲磺酸盐相反,这些化合物在露天储存后不会发生水解。对于各种碳-碳键形成反应,例如Mukaiyama-aldol以及-Michael反应和醛的烯丙基化,例举了二锡氧烷1的高催化活性。