Diplatinum Complexes Supported by Novel Tetradentate Ligands with Quinoline Functionalities for Tandem C−Cl Activation and Dearomatization

Three novel tetradentate ligands with quinoline functionalities, 1,2,4,5-tetrakis(6-ethylquinolin-8-yl)benzene, 1,2,4,5-tetrakis(6-tert-butylquinolin-8-yl)benzene, and 1,2,4,5-tetrakis(6-(trifluoromethoxy)quinolin-8-yl)benzene, were synthesized through a three-step protocol and fully characterized by NMR spectroscopic, elemental, and X-ray diffraction analyses. The dinuclear dimethylplatinum(II) complexes of these ligands readily activate C−Cl bonds of CHCl3 at ambient temperature, leading to the formation of the corresponding dinuclear Pt(IV) complex. In these reactions, the central phenyl rings of the tetradentate ligands are reduced to cyclohexadiene dianions and still retain their planarity.

三种带有喹啉官能团的新型四齿配体——1,2,4,5-四(6-乙基喹啉-8-基)苯、1,2,4,5-四(6-叔丁基喹啉-8-基)苯与1,2,4,5-四(6-(三氟甲氧基)喹啉-8-基)苯——通过三步合成法制备，并经核磁共振光谱、元素分析及X射线衍射分析完成全面表征。该类配体的双核二甲基铂(II)配合物可在室温下轻松活化三氯甲烷（CHCl₃）的碳氯键，生成对应的双核Pt(IV)配合物。在上述反应中，四齿配体的中心苯环被还原为环己二烯二阴离子，且仍保留其平面结构。