Role of the ligand in the cobalt(II)-catalysed decomposition of tert-butyl hydroperoxide. Evidence for the participation of bridged dicobalt complexes
作者:Philip G. Harris、Roy P. Houghton、Philip L. Taylor
DOI:10.1016/s0277-5387(96)00598-0
日期:1997.1
Abstract In the cobalt(II)-catalysed decomposition of t-butyl hydroperoxide at 25°C in a 5 : 1 mixture (v/v) of chlorobenzene and dioxane, cobalt 2-ethylhexanoate is more active as a catalyst than the cobalt(II) complexes of a number of 1,3-dicarbonyl compounds. These complexes become deactivated and, in general, a decrease in the acidity of the parent 1,3-dicarbonyl compound lowers the rate of deactivation
摘要在25°C的氯苯与二恶烷的5:1混合物(v / v)中钴(II)催化的叔丁基氢过氧化物的分解中,2-乙基己酸钴的催化活性比钴(II)高)许多1,3-二羰基化合物的配合物。这些配合物变得失活,并且通常,母体1,3-二羰基化合物的酸度降低会降低失活速率。这种关系以及2-乙基己酸酯的高活性与氢过氧化物的自由基链分解是由涉及桥联的二钴络合物的催化循环引发的。该循环不同于当前公认的哈伯和魏斯循环,因为它不直接产生烷氧基。