Owing to availability of various hydrogen sources, operational simplicity, and mild reaction conditions, catalytic transfer hydrogenation (TH) has emerged as an appealing alternative for the direct hydrogenation reactions with H₂ gas. Conventional TH catalysts are based on noble metals, such as Ru, Rh, and Ir, which are toxic and expensive due to their limited availability. Current research in this area is oriented towards the development of more sustainable catalysts utilizing abundant 1st row transition metals with readily accessible ligand platforms. During the past few decades, many novel examples of such systems appeared in the literature, expanding not only the number of catalyst surrogates but also the scope of unsaturated substrates, opening new venues for TH in organic synthesis. This review aims to provide an update on recent advances in homogeneous TH reactions catalyzed by base-metal (Mn, Fe, Co and Ni) complexes. Special attention is paid to selectivity and the mechanisms of such transformations.

由于各种氢源的可用性、操作简单性和温和的反应条件，催化转移加氢 (TH) 已成为与 H ₂直接加氢反应的有吸引力的替代方案气体。传统的 TH 催化剂基于贵金属，如 Ru、Rh 和 Ir，由于它们的可用性有限，它们有毒且昂贵。目前该领域的研究侧重于利用丰富的第一行过渡金属和易于获得的配体平台开发更可持续的催化剂。在过去的几十年里，文献中出现了许多此类系统的新例子，不仅扩大了催化剂替代物的数量，还扩大了不饱和底物的范围，为有机合成中的 TH 开辟了新的领域。本综述旨在提供由贱金属（Mn、Fe、Co 和 Ni）配合物催化的均相 TH 反应的最新进展。特别注意选择性和这种转化的机制。