Recently, the Topczewski´s group have carried out a kinetic analysis of the Banert cascade considering both sigmatropic and prototropic pathways for substituted 1-aryl-3-azido-1butynes. These authors demonstrated that, unlike the sigmatropic reaction, the rate of the prototropic reaction is notably influenced by the aryl substituent. Interestingly, an inflection point was pinpointed in the divergent pathways, which could be useful to predict which Banert product is favoured.