A novel catalytic behavior of simple rare-earth metal amides RE[N(SiMe₃)₂]₃ (RE = La(1), Nd(2), Sm(3), Yb(4), Y(5)) in the intermolecular addition of alcohols to carbodiimides was disclosed. A series of isoureas were obtained in good to excellent yields via the addition reaction in the presence of the optimal lanthanum amide La[N(SiMe₃)₂]₃. Kinetic studies were also conducted and a possible mechanism of catalytic transformation was suggested.

中文翻译：

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稀土金属酰胺催化碳二亚胺分子间加成醇†

简单稀土金属酰胺RE [N（SiMe ₃）₂ ] ₃（RE = La（1），Nd（2），Sm（3），Yb（4），Y（5）的新型催化行为公开了醇在碳二亚胺中的分子间加成。通过在最佳镧酰胺La [N（SiMe ₃）₂ ] ₃存在下的加成反应，以良好至优异的产率获得了一系列异脲。还进行了动力学研究，并提出了可能的催化转化机理。