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用萘锂(LiNp)还原无水CeCl_3制得的活性金属铈(Ce~*)在与羰基化合物的反应中,与用相同方法制得的Nd~*相比,表现出更高的反应活性。Ce~*与羰基化合物反应经水解可生成相应的醇,频哪醇和烯烃,其选择性不仅与反应时间和温度有关,而且还与羰基化合物的种类以及CeCl_3:LiNp:RCOR＇的摩尔比有关。初步研究了Ce~*作用下的酮和一些卤代烃的反应。
The activity of cerium (Ce ~ *) prepared by the reduction of anhydrous CeCl_3 with naphthalene lithium (LiNp) shows higher reactivity than that of Nd ~ * prepared by the same method. Hydrolysis of Ce ~ * with carbonyl compounds gives the corresponding alcohols, pinacols and olefins. The selectivity depends not only on reaction time and temperature, but also on the type of carbonyl compound and the molar ratio of CeCl_3: LiNp: RCOR ’. The reaction of ketones with some halogenated hydrocarbons under the action of Ce ~ * was preliminary studied.