α-Allenols have become common advanced synthon for the synthesis of various of structures and frequent motif in natural products and pharmaceuticals. The special reactivity could occurs due to the synergistic effect of the allene and hydroxyl functional groups. Thus, many remarkable and elegant protocols have been explored through two-electron transfer ionic pathway for the construction of α-allenols. Recently, the rapidly growth of radical chemistry provided a alternative strategy to achieve α-allenols via single electron transfer with mild conditions, high-efficiency, excellent selective control. In this perspective, we will summarize the most important contributions for the construction of α-allenols via radical intermediates by categorizing them into different types of substrates. Additionally, the mechanistic studies and synthetic challenges will also be highlighted.
