Cationic Carboxylato Complexes of Dirhodium(II) with Oxo Thioethers: Catalysts for Silane Alcoholysis under Homogeneous and Liquid-Liquid Biphasic Conditions
作者:Andrea Biffis、Marino Basato、Marianna Brichese、Luca Ronconi、Cristina Tubaro、Alessandra Zanella、Claudia Graiff、Antonio Tiripicchio
DOI:10.1002/adsc.200700167
日期:2007.11.5
A set of cationic dirhodium(II) complexes with oxo thioethers was prepared and employed as catalysts for the silane alcoholysis reaction. The complexes were found to be highly active under homogeneous conditions, both in the absence and in the presence of a solvent, including coordinating solvents such as N,N-dimethylformamide; the catalysts could be conveniently employed in concentrations as low as
制备了一组与羰基硫醚的阳离子二吡啶(II)配合物,并将其用作硅烷醇解反应的催化剂。发现该络合物在均相条件下,在不存在和存在溶剂(包括配位溶剂,例如N,N)的情况下均具有高活性-二甲基甲酰胺;该催化剂可方便地以低至0.01 mol%的浓度使用,并且在24小时后记录的最大TON为30000。在液-液两相条件下也使用相同的催化剂,并以离子液体作为含催化剂的相:在这些条件下观察到相当的催化活性,并且含催化剂的相可以回收和再循环。在这项工作的框架内,还制备了一种手性阳离子(II)络合物。不幸的是,尝试用该催化剂进行外消旋醇的动力学拆分。