i Pr 2 C 6 H 3 ( H 2 L 3 ), R 1 = C 6 H 10 , R 2 = 2,6-Me 2 C 6 H 3 ( H 2 L 4 )) were prepared in 65–78% isolated yields by the condensation reaction of dicarboxylic acid with four equimolar amounts of amines in the presence of PPSE (polyphosphoric acid trimethylsilyl ester) at 180 °C. Alkane elimination reaction of AlMe 3 with 0.5 equivalent of the bridged-amidines ( H 2 L ) in THF at room temperature
为了了解双
金属配合物是否可以在聚合反应中显示协同作用,其相关的单核类似物L AlMe 2(L 5(5),L 6(6),L 7(7),L 8(8))也具有通过用1当量的HL([PhC(N-2,6- i Pr 2 C 6 H 3)2] H(HL 5),[PhC(N -2,6-Me 2 C 6 H 3)2] H(HL 6),[CyC(N-2,6- i Pr 2 C 6 H 3)2] H(HL 7),[CyC(N-室温下在THF中的2,6-Me 2 C 6 H 3)2] H(HL 8))。所有这些配合物均通过元素分析,FT-IR和NMR光谱进行了表征。通过X射线衍射确定H 2 L 3,1、3、5和7的晶体结构。在所有这些a基铝甲基络合物中,Al由来自二合ami酰胺
配体的两个氮原子和两个甲基四配位,以采用扭曲的四面体几何形状。这些配合物在室温下对
ε-己内酯的开环聚合具有活性,从而得到单峰分子量分布的聚酯。