Synergistic catalysis, a type of plural catalysis which utilizes at least two different catalysts to enable a reaction between two separately activated substrates, has unlocked a plethora of previously unattainable transformations and novel chemical reactivity. Despite the appreciable utility of synergistic catalysis, specific examples involving two transition metals have been limited, as ensuring a judicious choice of reaction parameters to prevent deactivation of catalysts, undesirable monocatalytic event(s) leading to side products, or premature termination and other potentially troublesome outcomes present a formidable challenge. Excluding those driven by photocatalytic mechanisms, this review will highlight the reported examples of reactions that make use of two simultaneous catalytic cycles driven by two transition metal catalysts.

中文翻译：

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协同双重过渡金属催化

协同催化是利用至少两种不同催化剂在两个单独活化的底物之间进行反应的多种催化的一种，已经解锁了许多以前无法实现的转化和新的化学反应性。尽管协同催化有明显的用途，但涉及两种过渡金属的具体实例仍然受到限制，因为要确保明智地选择反应参数以防止催化剂失活，导致副产物的不希望的单催化事件或过早终止以及其他潜在的麻烦成果提出了艰巨的挑战。除了由光催化机制驱动的那些反应外，本综述还将重点介绍已报道的利用两个过渡金属催化剂驱动的两个同时催化循环进行反应的实例。