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Protonation Behaviour of Chiral Tetradentate Polypyridines Derived from a-Pinene

机译:α-P烯衍生的手性四齿多吡啶的质子化行为

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Detailed protonation experiments of the[5,6]-pinenebipyridine molecule and the unsubstituted[4,5]-and[5,6]-CHIRAGEN[0]ligands in various solvents indicate a variety of structures of the protonated species.UV-visible and NMR measurements(including I5N chemical shifts)show the transition from trans to cis confor- mation of[5,6]-pinenebipyridine upon protonation.The[4,5]-CHIRAGEN[0]ligand,in which the protonation sites of the nitrogen atom donors are at opposite sides of the molecule,behave essentially like two independent bipyridine moieties;this behaviour was monitored by UV-visible,CD and NMR spectroscopy(including 15N data).In the case of the[5,6]-CHIRA-GEN[0],a pocket of donor atoms provides a chiral environment for two protons per ligand.
机译:[5,6] -pine烯联吡啶分子和未取代的[4,5]-和[5,6] -CHIRAGEN [0]配体在各种溶剂中的详细质子化实验表明质子化物种的各种结构。紫外可见NMR和NMR测量(包括I5N化学位移)显示了[5,6] -pine烯联吡啶在质子化过程中从反式到顺式构象的转变。[4,5] -CHIRAGEN [0]配体在其中的质子化位点氮原子供体在分子的相对侧,基本上像两个独立的联吡啶部分;该行为通过紫外可见,CD和NMR光谱法(包括15N数据)进行监测。在[5,6] -CHIRA的情况下-GEN [0],供体原子的口袋为每个配体提供两个质子的手性环境。

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