previously reported methodology. The reactivity of 3 and 4 in hydroamination/cyclisation is reported. Both diamido complexes have been found to improve catalytic activity as compared with the previously reported mono-amido analogues. Complexes 3 and 4 were observed to be selective for primary amines over secondary amines in hydroamination/cyclisation. The lack of reactivity with secondary amines is
2-(1,3-Bis-3'-丁基
咪唑-1'-基-2'-亚烷基)亚苯基)双(二甲基
氨基)
碘锆(iv)(3)和2-(1,3-bis-3'通过对溶剂和
化学计量的改进,由先前报道的方法制备了-丁基
咪唑-1'-基-2'-亚烷基)亚苯基)双(二甲基酰胺基)
溴锆(iv)(4)。据报道3和4在加
氢胺化/环化中的反应性。与先前报道的单酰胺类似物相比,发现两种二酰胺基络合物均改善了催化活性。配合物3和4在加
氢胺化/环化反应中,发现仲胺对仲胺的选择性高于仲胺。与仲胺的反应性的缺乏与涉及必需形成Zr-
酰亚胺基中间体的机理相一致。