New boronates prepared from 2,4-pentanedione derived ligands of the NO2 and N2O2 type – comparison to the complexes obtained from the corresponding salicylaldehyde derivatives
作者:Mario Sánchez、Obdulia Sánchez、Herbert Höpfl、Maria-Eugenia Ochoa、Dolores Castillo、Norberto Farfán、Susana Rojas-Lima
DOI:10.1016/j.jorganchem.2003.11.032
日期:2004.2
heterocycle had been reported, it becomes apparent that there may be differences in reactivity when comparing 2,4-pentanedione and salicylaldehyde derived ligands. The molecular compositions of the boron complexes prepared from acacenH2 and acacpenH2 are analogous to the corresponding salen and salpen derivatives, however, the presence of two methyl groups in the six-membered chelate rings generates some structural
2,4-戊二酮(=乙酰丙酮)已与2-氨基乙醇,1,2-二氨基乙烷和1,3-二氨基丙烷反应生成NO 2和N 2 O 2型配体,分别为acacaminolH 2,acacenH 2和acpenH 2,它们在结构上和电子上与衍生自水杨醛的相应配体(salaminolH 2和salenH 2)相关。在acacaminolH 2与苯基硼酸反应后,获得了双核单体配合物,该配合物包含一个三和一个四配位的硼原子,以及一个六元和一个七元杂环。由于使用了salaminolH 2已经报道了具有中心10元杂环的二聚配合物,当比较2,4-戊二酮和水杨醛衍生的配体时,很明显在反应性上可能存在差异。由acacenH 2和acacpenH 2制备的硼配合物的分子组成它们类似于相应的salen和salpen衍生物,但是,在六元螯合环中存在两个甲基会产生一些结构变化,最重要的是中央杂环的船构象的变形。这是通过计算方法预测的,