The rhodium-catalyzed, highly N 2 -and N 1 -selective coupling of benzotriazoles with allenes is reported. The exceptionally high N 2 and N 1 selectivities were achieved by using a rhodium(I)/DPEphos and rhodium(I)/JoSPOphos catalyst, respectively. This method permits the atom-economic synthesis of valuable branched N 2 -and N 1 -allylated benzotriazole derivatives and allows for preliminary studies of their reactivity.