An efficient and convenient heterogeneous catalytic system has been developed for the aerobic cross-dehydrogenative coupling over NiGa layered double oxide (Ni₃Ga-LDO) without any additives. The results indicated that the catalytic system could tolerate various tetrahydroquinoline derivatives and nucleophiles using molecular oxygen as a sustainable oxidant. The catalyst could be recycled four times without significantly decrease of activity or change of XRD pattern, indicating that Ni₃Ga-LDO was catalytically and structurally stable in the cross-coupling reaction.

中文翻译：

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NiGa层状双氧化物上叔胺的有效好氧交叉脱氢偶联

已开发出一种高效便捷的非均相催化体系，用于在无任何添加剂的NiGa层状双氧化物（Ni ₃ Ga-LDO）上进行好氧交叉脱氢偶联。结果表明，使用分子氧作为可持续氧化剂，该催化体系能够耐受各种四氢喹啉衍生物和亲核试剂。该催化剂可循环使用四次而不会显着降低活性或改变XRD谱图，表明Ni ₃ Ga-LDO在交叉偶联反应中具有催化和结构稳定性。