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文献报道的将零价态镧系金属直接用于有机反应尚不多见,而且即使在活化试剂存在下,一些稀土金属如Ce、sm等对有机底物的活性并不象预期的那么高。为此,本文提出了用强还原剂石墨钾、萘锂还原无水稀土氯化物制得原位(in situ)生成的高分散的零价稀土金属。发现所得零价态稀土金属有较高的反应活性。本文首次报道用石墨钾(C_8K)还原无水SmCl_3得到石墨分散的零价态钐及其与苯甲酰氯的反应,产物为联苯甲酰、安息香和1,2-二苯乙烯二醇二苯甲酸酯。
It has not been reported in the literature that the zero-valent lanthanide metal is directly used in the organic reaction, and some rare-earth metals such as Ce, Sm and the like do not act as much on the organic substrate as expected even in the presence of an activating reagent. For this reason, this paper presents a highly dispersed zero-valent rare earth metal formed in situ by reduction of anhydrous rare earth chloride with a strong reducing agent graphite potassium and naphthalene lithium. The resulting zero-valent rare earth metal has higher reactivity. This paper reports for the first time that Graphite potassium (C_8K) is used to reduce anhydrous SmCl_3 to obtain graphite-dispersed samarium and its reaction with benzoyl chloride. The products are dibenzoyl, benzoin and stilbene glycol Formate.