Mono- and Bimetallic Rhodium(I) Complexes Supported by New C2-Symmetric Bis-N-heterocyclic Carbene Ligands: Metalation via CC Bond Cleavage under Mild Conditions

The first example of a tethered chiral enetetramine is presented along with its mild metalation with Rh(I) sources to produce chiral, bis-N-heterocyclic carbene complexes. Subtle steric effects determine whether an enetetramine is accessible versus a free biscarbene.本研究首次报道了首例锚联型手性烯四胺（enetetramine），并同步展示了其与铑(I)试剂经温和金属化反应制备手性双氮杂环卡宾配合物的方法。细微的空间位阻效应决定了反应倾向于生成烯四胺，还是游离双卡宾。