Chair−Boat Form Transformation of Piperazine-Containing Ligand toward the Preparation of Dirhenium Metallacycles

A new generation of a flexible bipyridine-based ligand, 1,4-bis(4-pyridyl)-piperazine, with two main stable states (chair and twist-boat forms) was employed in the construction of unusual dirhenium metallacycles.一种新一代柔性联吡啶基配体（flexible bipyridine-based ligand）——1,4-双(4-吡啶基)哌嗪（1,4-bis(4-pyridyl)-piperazine），拥有椅式与扭船式两种主要稳定构象，被应用于非常规二铑金属环化合物（dirhenium metallacycles）的构建。