A reflection on frustrated Lewis pairs 20 years on: the gift that keeps on giving

This commentary reflects on the remarkably broad impact the concept of "frustrated Lewis pairs" (FLPs) has had over the past 20 years. Since its initial articulation, this concept has found applications across the periodic table and the discipline, leading to new avenues for synthesis and catalysis, building on the 2011 publication (R. C. Neu, E. Otten, A. Lough and D. W. Stephan, <i>Chem. Sci.</i>, 2011, <b>2</b>, 170, https://doi.org/10.1039/C0SC00398K).