金属有机RReO3化合物研究进展

RReO₃是一种过渡金属有机化合物,其中,甲基三氧化铼是最早被发现的一种稳定的RReO₃型化合物,然而由于当时未能得到一种有效的合成路线,所以对甲基三氧化铼的研究没有引起重视。直到1988年德国Herrmann W A等发明了一种简便有效的合成方法,并且发现这类化合物可以高效催化烯烃环氧化反应后,RReO₃型化合物才引起重视。综述了迄今为止报道的含有不同R基团的RReO₃类化合物的合成方法,主要包括锌路线和锡路线两种合成方法,系统阐述了不同类型R基取代基对化合物稳定性的影响,同时总结了不同类型RReO₃型化合物催化性能的研究进展。然而,除甲基三氧化铼外,目前发现的大多数RReO₃型化合物在空气及潮湿环境下稳定性较差,限制了其催化应用。分析了影响催化剂稳定性的因素,并建议通过深入研究分子构效关系,探讨稳定性与催化性能的作用规律,从而指导催化剂的设计与合成,并对未来的发展方向进行展望。

Research progress in organometallic RReO3 compounds

RReO3 is a type of transition metal organometallic compound. The first reported stable RReO3 compound is methyltrioxorhenium. Although methyhrioxorhenium was found very early, the real develop- ment was only after 1988 since Herrmann W Aet al. found an efficient synthesis way of RReO3 com- pound. In the meantime, the remarkable catalytic behaviour of methyltrioxorhenium for olefin epoxidation had been reported. Thus, more and more researches focused on the synthesis and catalytic performance of RReO3 compounds. In this paper,the advance in the synthetic methods of RReO3 compounds with differ- ent R groups, mainly including organic zinc and tin routes, and physicochemical properties and catalytic behaviour of RReO3 compounds were reviewed. The effect of R groups on the stability and catalytic prop- erties of RReO3 compounds was discussed. Because most of RReO3 compounds were not stable under the environment of air and moisture except methyltrioxorhenium, the study of their catalytic applications was restricted. The factors that affected the stability of the compounds were analyzed, and in order to design and prepare the catalysts, the action rules of the stability and catalytic properties were investigated by further study of the stuctural effect. The development prospects of RReO3 compounds in the future were outlined.