In a world where chemistry has always been about breaking down complex molecules, new breakthroughs are challenging traditional assumptions. At the heart of this innovation lies the copper(I)-catalysed allene–ketone addition (CuAKA), a reaction that forms robust yet reversible carbon-carbon bonds under biologically relevant conditions. While click chemistry’s reputation hinges on reliability—fast, selective reactions that thrive in messy biological environments—it’s now being pushed to create durable linkages. This shift signals a reimagining of the field, where even 'forbidden' bond formations can meet the demands of real-world applications.
