A convenient and efficient alternative to the classical Richman–Atkins methodology for obtaining PCTA and new derivatives is reported. The key macrocyclization step occurs in good yields as a result of a sodium template effect. The potentiality of lanthanide(III) complexes derived from these new PCTA ligands to act as paramagnetic contrastophores or luminophores is reported.

中文翻译：

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轻松访问具有羧基，酰胺和膦酸酯连接功能的12元大环配体PCTA及其衍生物

据报道，它是传统的Richman-Atkins方法获得PCTA和新衍生物的一种便捷有效的替代方法。由于钠模板效应，关键的大环化步骤以高收率发生。据报道，衍生自这些新的PCTA配体的镧系元素（III）可能用作顺磁性造影剂或发光体。