At KAIST in South Korea, a chemistry research group has found a way to resolve one of pharmaceutical synthesis's quieter frustrations: the tendency of catalytic systems to stumble over their own efficiency. By carefully tuning a copper catalyst with a cyclopropenimine ligand, Professor Sarah Yunmi Lee's team demonstrated that harmony between competing chemical steps matters more than the raw power of any single one. The work, published in the Journal of the American Chemical Society, opens previously inaccessible molecular territory and suggests that the future of complex drug synthesis may li